JP2002205606A - Weather strip for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weather strip, in which vinyl chloride resin is not used to reduce the risk of generation of dioxin, and reduction in weight and reduction in manufacturing cost are implemented. SOLUTION: The weather strip for an automobile is formed by bonding a hollow seal portion 8 made of rubber foam on the car out side of a trim body portion 2 constituting a trim main body 1 via adhesive layer 6 of an isocyanate group, and the weather strip is mounted on a body flange 9 of the automobile. In the weather strip, the trim body portion 2 is made of thermoplastic elastomer, and a bonding layer 7 having thickness of 10 μm or more is disposed between the trim body portion 2 and the adhesive layer 6. The bonding layer 7 is formed of a thermoplastic elastomer composition made by mixing modified polyolefin resin A graft-modified with an unsaturated hydroxy compound and partially crosslinked olefin polymer rubber B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip mounted on a body flange of an automobile.

[0002]

2. Description of the Related Art A description will be given with reference to FIGS.
Conventionally, a weatherstrip provided with a trim frame 20 made of a vinyl chloride resin is attached to a body flange 9 of an automobile. However, this conventional weatherstrip cannot adequately cope with the recent market needs of environmental preservation and weight reduction. Trim frame 2
Because the vinyl chloride resin constituting 0 contains chlorine, it may be a cause of dioxin generation,
And the specific gravity of the vinyl chloride resin is as high as 1.15 or more.

As a means for avoiding such a problem, it is conceivable that the trim body is made of a thermoplastic elastomer having a light specific gravity (mainly a thermoplastic olefin-based elastomer) without generating dioxin. However, since the thermoplastic olefin-based elastomer has no polar group in its structure, its adhesiveness is remarkably inferior to that of the vinyl chloride resin. It is difficult to adhere the part 8. Therefore, in order to enhance the adhesiveness, it is necessary to apply an expensive special primer, and further, a high-temperature and long-time process is required, so that the manufacturing cost is greatly increased. From the viewpoint of manufacturing cost, it is cheaper not to use the primer coating as in the prior art.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above problems, and thereby avoids the danger of dioxin generation by avoiding the use of a vinyl chloride resin, reduces the weight, and avoids the application of a primer. It is an object of the present invention to provide a weather strip for an automobile that can reduce the manufacturing cost.

[0005]

Means for Solving the Problems The first invention will be described with reference to FIG. 1 and FIG. The automotive weather strip according to the first invention has a trim body 2 having a substantially inverted U-shaped cross section.
And a plurality of gripping claws 4 protruding from the inner wall surface of the trim body 2 and a metal core 5 embedded in the trim body 2. In addition, a hollow sealing portion 8 made of sponge rubber is provided via an adhesive layer 6 made of an isocyanate group, and the trim body portion 2 and the gripping claw portion are provided in an automobile weather strip attached to an automobile body flange 9. 4 is formed of a thermoplastic elastomer, and an adhesive layer 7 having a thickness of 10 μm or more is provided between the trim frame 2 and the adhesive layer 6.
And the adhesive layer 7 is constituted by a thermoplastic elastomer composition comprising a mixture of a modified polyolefin resin A graft-modified with an unsaturated hydroxy compound and a partially crosslinked olefin polymer rubber B. is there.

The second invention will be described with reference to FIGS. The automotive weather strip according to the second aspect of the invention includes a trim frame 2 having a substantially inverted U-shaped cross section, a plurality of gripping claws 4 protruding from an inner wall surface of the trim frame 2, and the trim frame 2. A hollow seal portion 8 made of sponge rubber is provided on the vehicle exterior side of the trim body portion 2 of the trim main body 1 formed by the core metal 5 embedded in the body via an adhesive layer 6 of an isocyanate group, In the automotive weather strip attached to the body flange 9 of the automobile, the trim frame 2 and the gripping claws 4 are formed of a thermoplastic elastomer, and the thickness between the trim frame 2 and the adhesive layer 6 is 10 μm or more. The adhesive layer 7 is formed by adding 0.01 to 40 parts by weight of a copolymer of ethylene and a hydroxyl group-containing unsaturated compound to 100 parts by weight of a thermoplastic olefin resin, 'S compound 0.01-5 parts by weight and / or tertiary amine compound 0.01-20
It is constituted by an elastomer composition obtained by mixing 1 part by weight and 1 to 200 parts by weight of an elastomer component.

The third invention will be described with reference to FIGS. 1 and 4. The automotive weather strip according to the third invention includes a trim frame 2 having a substantially inverted U-shaped cross section, a plurality of gripping claws 4 protruding from an inner wall of the trim frame 2, and a trim frame 2. A trim seal body 8 made of sponge rubber is provided on an outer side of the trim body 2 of the trim body 1 formed from the embedded metal core 5 via an adhesive layer 6 based on an isocyanate group. In the automotive weather strip attached to the body flange 9 described above, the trim frame 2 is formed by mixing a modified polyolefin resin A graft-modified with an unsaturated hydroxy compound and a partially crosslinked olefin polymer rubber B. It is composed of a plastic elastomer composition.

Referring to FIGS. 1 and 4, a fourth invention will be described. The automotive weather strip according to a fourth aspect of the present invention includes a trim frame 2 having a substantially inverted U-shaped cross section, a plurality of gripping claws 4 projecting from an inner wall surface of the trim frame 2, and the trim frame 2. A hollow seal portion 8 made of sponge rubber is provided on the vehicle exterior side of the trim body portion 2 of the trim main body 1 formed by the core metal 5 embedded in the body via an adhesive layer 6 of an isocyanate group, In a weather strip for an automobile attached to a body flange 9 of an automobile, the trim skeleton 2 is made of a thermoplastic olefin resin 1.
To 00 parts by weight, 0.01 to 40 parts by weight of a copolymer of ethylene and a hydroxyl group-containing unsaturated compound, 0.01 to 5 parts by weight of an organotin compound and / or 0.01 to 20 parts by weight of a tertiary amine compound Part and elastomer component 1-2
It is composed of an elastomer composition containing 00 parts by weight.

When the amount of the copolymer of ethylene and the unsaturated compound having a hydroxyl group is less than 0.01 part by weight, the adhesive strength is undesirably low. On the other hand, if the amount exceeds 40 parts by weight, the amount of the expensive polymer to be added increases and the cost increases. In addition, the polymer is undesirably delaminated or bleed-out, resulting in reduced adhesive strength.

When the amount of the organotin compound is less than 0.01 parts by weight, the adhesive strength becomes weak, which is not preferable. On the other hand, when the amount exceeds 5 parts by weight, the adhesive strength in proportion to the added amount is not obtained, but the deterioration of the polyolefin may be accelerated.

When the amount of the tertiary amine compound is less than 0.01 parts by weight, the adhesive strength may be extremely weak, which is not preferable. On the other hand, when the amount exceeds 20 parts by weight, the amount of the expensive polymer is large, so that not only the cost is increased but also the effect proportional to the amount of the polymer is not obtained.

It is convenient to add an elastomer component since the rigidity and impact resistance can be adjusted. Accordingly, from the viewpoint of mechanical strength, the elastomer component is added to 100 parts by weight of the olefin resin in a proportion of
It is preferred to use ~ 200 parts by weight.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the first invention is shown in FIG.
And FIG. This automotive weather strip is provided on the outside of the trim body 2 which is a constituent member of the trim main body 1 with an adhesive layer 6 of an isocyanate group interposed therebetween.
A hollow seal portion 8 made of sponge rubber and elastically contacting a door 10 is provided, and is attached to a body flange 9 of an automobile.

The trim main body 1 includes a trim frame 2 having a substantially inverted U-shaped cross section, a plurality of gripping claws 4 protruding from the inner wall of the trim frame 2, and a metal core 5 embedded in the trim frame 2. Consists of A lip portion 2a that covers an end of an interior material 14 attached to the interior of the vehicle is provided on the interior side of the trim body 2.
Is provided. A trim outer layer 3 is provided on the surface of the trim frame 2 and the lip 2a in consideration of design.

The trim frame 2 and the gripping claws 4 are formed of a thermoplastic elastomer, and an adhesive layer 7 having a thickness of 10 μm or more is provided between the trim frame 2 and the adhesive layer 6. The adhesive layer 7 is a thermoplastic elastomer composition comprising a mixture of a modified polyolefin resin A graft-modified with an unsaturated hydroxy compound and a partially crosslinked olefin polymer rubber B.

In a second aspect of the present invention, in the first aspect, 0.01 to 40 parts by weight of a copolymer of ethylene and a hydroxyl group-containing unsaturated compound is added to 100 parts by weight of the thermoplastic olefin resin. 0.01 to 5 parts by weight of organotin compound and / or 0.01 to 20 tertiary amine compound
It is an elastomer composition obtained by mixing 1 part by weight and 1 to 200 parts by weight of an elastomer component.

In the automotive weather strip of the first or second aspect of the invention, if the thickness of the adhesive layer 7 is less than 10 μm, the adhesive strength is not uniform, which is not preferable.

In the automotive weather strip according to the first or second aspect of the invention, an adhesive layer 7 is provided between the trim frame 2 and the adhesive layer 6, and the adhesive layer 7 is not a cause of dioxin generation. And is made of a substance having a lower specific gravity than the conventional vinyl chloride resin, which is effective for environmental protection. Further, it is possible to contribute to the weight reduction of the weather strip and the vehicle to which the weather strip is attached.

Incidentally, the weather strip for an automobile according to the present invention is 210 g / m, and the weather strip (250 g / m) made of a conventional vinyl chloride resin.
It is possible to achieve a 16% reduction in weight as compared with.

The adhesive layer 7 has excellent adhesiveness to both the thermoplastic elastomer trim body 1 and the adhesive layer 6, so that the hollow seal portion 8 can be firmly adhered to the trim body 1. Therefore, there is no need to apply a primer, and the manufacturing cost can be reduced.

FIG. 5 is a view corresponding to FIG. 3 showing a modified example, in which the trim outer layer portion 3 is extended to the side of the bonding surface with the hollow seal portion 7 made of sponge rubber, and the bonding layer 7 is provided thereon. .

FIG. 6 is a view corresponding to FIG. 3 showing another modification, in which the adhesive layer 7 is colored and extended to the tip of the lip 2a.

FIGS. 1 and 4 show an embodiment of the third invention.
Shown in As in the first invention, this automotive weather strip has a hollow seal portion 8 made of sponge rubber provided on an outer side of a trim body 2 constituting a trim main body 1 with an adhesive layer 6 of isocyanate group interposed therebetween. Composed,
It is attached to the body flange 9 of the automobile.

The trim main body 1 includes a trim frame 2 having a substantially inverted U-shaped cross section, a plurality of gripping claws 4 projecting from the inner wall of the trim frame 2, and a metal core 5 embedded in the trim frame 2. Consists of In addition, a trim outer layer 3 may be provided on the surface of the trim frame 2 in consideration of design.

The trim body 2 is formed of a thermoplastic elastomer composition comprising a mixture of a modified polyolefin resin A graft-modified with an unsaturated hydroxy compound and a partially crosslinked olefin polymer rubber B. .

In a fourth aspect of the present invention, in the third aspect, the trim skeleton 2 is added to 100 to 100 parts by weight of a thermoplastic olefin resin, and 0.01 to 40 parts by weight of a copolymer of ethylene and a hydroxyl group-containing unsaturated compound. , Organotin compound 0.01
-5 parts by weight and / or tertiary amine compound 0.01
To 20 parts by weight and 1 to 200 parts by weight of an elastomer component.

In the automotive weather strip according to the third and fourth aspects of the invention, the trim frame 2 is effective for environmental protection and can reduce the weight of the automobile. Polyolefin resins do not generate dioxins, and have a lower specific gravity than conventional vinyl chloride resins.

In the automotive weather strip of the first, second, third or fourth invention, a trim outer layer 3 for improving the design can be provided on the surface of the trim frame 2.

Further, the trim main body made of the modified polyolefin resin has high adhesiveness to the adhesive layer 6, so that the hollow seal portion 8 can be firmly bonded to the trim main body 1. This eliminates the need for primer application,
The manufacturing cost can be reduced.

[0030]

EXAMPLE The inventor conducted an experiment shown in FIG. 7 to confirm the adhesiveness of the automotive weather strip according to the present invention.

EPDM corresponding to the material of the hollow seal portion 8
As sponge rubber 12 EPDM 100 parts by weight Carbon black 105 parts by weight Process oil 65 parts by weight Calcium oxide 40 parts by weight Sulfur 1.5 parts by weight Vulcanization accelerator 2.8 parts by weight Azodicarbonamide 2.5 parts by weight Urea compound 1. 3 parts by weight were used.

The plate 11 corresponding to the material of the trim body 2, lip 2a and gripping claw 4 was made of Mitsui Chemicals' Mirastomer G650.

As an adhesive corresponding to the adhesive layer 6, Hybon 7118 of Hitachi Chemical Polymer was used as a main agent, and Desmodur RF of Sumitomo Bayer Urethane was used as a crosslinking agent.

In the experiment, first, E was extruded in advance.
A thermoplastic elastomer comprising a mixture of a PDM sponge rubber 12 (a material constituting the hollow seal portion 8), a modified polyolefin resin A graft-modified with an unsaturated hydroxy compound, and a partially crosslinked olefin polymer rubber B, or 100 parts by weight of thermoplastic olefin resin,
0.01 to 40 parts by weight of a copolymer of ethylene and a hydroxyl group-containing unsaturated compound and 0.01 to 40 parts by weight of an organotin compound
5 parts by weight and / or tertiary amine compound 0.01 to
Elastomer composition comprising 20 parts by weight and 1 to 200 parts by weight of an elastomer component (material constituting the adhesive layer 7 in the first and second inventions and the trim body 2 in the third and fourth inventions) A plurality of samples were manufactured by attaching a plate 11 made of a resin and another plate 11 made of a vinyl chloride resin.

Prior to the application, the EPDM sponge rubber 12 is subjected to a pretreatment such as (a) buffing, (b) degreasing, (c) primer application, (d) drying, (e) application of the adhesive 16, and (f) drying. Was given. The plate 11 was subjected to (A) degreasing and (O) heating. In addition, the EPDM sponge rubber 12 and the plate 11 were attached by applying a load of 6 kg for 5 minutes at a room temperature of 20 ° C.

Next, the plate 11 side of this sample is fixed to the substrate 15, and as shown in FIG. 7, the end of the EPDM sponge rubber 12 is raised by about 90 °, and while being pulled by hand in the direction of arrow Y, the sharp About 60 with a simple cutter knife 13
A cut was made from the angle Z of ゜. Knife cutting interval L
Was performed at 2 mm to 3 mm, and the interface state was visually observed and evaluated. Table 1 shows the results. In the evaluation, the rate of cohesive failure of the adhesive layer and the rate of peeling at the interface between the adhesive layer and the sheet 11 were expressed with respect to the total contact area of 100%. The higher the rate of cohesive failure, the stronger the adhesive force. In the table, PVC means a vinyl chloride resin, TPO means a thermoplastic olefin-based elastomer, and TPS means a thermoplastic styrene-based elastomer.

[0037]

[Table 1]

The specific names of the components of the present invention 1 in Table 1 are: unsaturated hydroxy compound: hydroxymethacrylate,
Hydroxyethyl acrylate, polyethylene glycol monomethacrylate Polyolefin resin to be modified: At least one of propylene-ethylene block copolymer or propylene-ethylene random copolymer Unmodified polyolefin resin: Propylene homopolymer,
Propylene-ethylene block copolymer, propylene-ethylene random copolymer Partially crosslinked olefin-based polymer rubber: ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber Organotin compounds: dibutyltin dilaurate, dibutyltin shearate. The specific names of the components of the present invention 2 in Table 1 are: olefin resin: propylene-ethylene block copolymer ethylene and hydroxyl group-containing unsaturated compound: ethylene-2-hydroxyethyl methacrylate copolymer organotin compound: dibutyltin dilaurate amine Compound: ethylene-2-dimethylaminoethyl methacrylate copolymer elastomer composition: propylene-ethylene block copolymer.

As is clear from the experimental results shown in Table 1,
Regarding the adhesive strength, the constituent material of the present invention is slightly inferior to the vinyl chloride resin as the constituent material according to the prior art, but is balanced, and there is no substantial difference. Therefore, from a comprehensive viewpoint such as adhesion, environmental preservation and weight reduction, a thermoplastic elastomer comprising a mixture of a modified polyolefin resin A graft-modified with an unsaturated hydroxy compound and a partially crosslinked olefin polymer rubber B, Alternatively, 0.01 to 4 parts by weight of a copolymer of ethylene and a hydroxyl group-containing unsaturated compound is added to 100 parts by weight of a thermoplastic olefin resin.
An elastomer composition comprising 0 parts by weight, 0.01 to 5 parts by weight of organotin and / or 0.01 to 20 parts by weight of a tertiary amine compound and 1 to 200 parts by weight of an elastomer component is used. The present invention is excellent.

[0040]

According to the weather strip for automobiles according to the first and second inventions, an adhesive layer 7 is provided between the trim frame 2 and the adhesive layer 6, and the adhesive layer 7 does not generate dioxin. It is effective for environmental protection and can contribute to weight reduction of weather strips and automobiles.

The adhesive layer 7 has excellent adhesiveness to both the thermoplastic elastomer trim body 1 and the adhesive layer 6, so that the hollow seal portion 8 can be firmly adhered to the trim body 1. This eliminates the need for primer application and can reduce manufacturing costs.

According to the weather strips for automobiles according to the third and fourth aspects of the invention, the trim frame 2 does not generate dioxin, and is therefore effective for environmental protection. The weight can be reduced.

Further, since the trim main body 1 has high adhesiveness to the adhesive layer 6, the hollow seal portion 8 can be firmly adhered to the trim main body 1, so that no primer coating is required and the manufacturing cost is low. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view showing an automobile to which a weather strip is attached.

FIG. 2 shows a weather strip according to a conventional example, and is a cross-sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional view of the embodiment of the weather strip according to the first and second inventions, taken along the line AA in FIG. 1;

FIG. 4 is a cross-sectional view taken along line AA in FIG. 1, showing an embodiment of a weather strip according to third and fourth inventions.

FIG. 5 is a diagram corresponding to FIG. 3, showing a modification.

FIG. 6 is a diagram corresponding to FIG. 3, showing another modification.

FIG. 7 is an explanatory diagram showing an experiment method of adhesive strength.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trim main body 2 Trim frame part 2a Lip part 3 Trim outer layer part 4 Claw part 5 Core metal 6 Adhesive layer 7 Adhesive layer 8 Hollow seal part 9 Body flange 10 Door 11 Plate 12 EPDM sponge rubber 13 Cutter knife 14 Interior material 15 Substrate 20 Trim frame L distance Y peeling direction Z angle

Claims (4)

[Claims] A trim body having a substantially inverted U-shaped cross section (2).
And a plurality of gripping claws (4) protruding from the inner wall of the trim body and a core metal (5) embedded in the trim body. An automotive weather strip, comprising a hollow seal portion (8) made of sponge rubber provided on an outer side of a vehicle via an adhesive layer (6) of an isocyanate group and attached to a body flange (9) of the vehicle. The trim frame and the gripping claws are formed of a thermoplastic elastomer, and an adhesive layer (7) having a thickness of 10 μm or more is provided between the trim frame and the adhesive layer, and the adhesive layer is formed of an unsaturated hydroxy compound. An automobile characterized by comprising a thermoplastic elastomer composition comprising a mixture of a graft-modified modified polyolefin resin (A) and a partially crosslinked olefin polymer rubber (B). Weather strip. 2. A trim body having a substantially inverted U-shaped cross section.
And a plurality of gripping claws (4) protruding from the inner wall of the trim body and a core metal (5) embedded in the trim body. An automotive weather strip, comprising a hollow seal portion (8) made of sponge rubber provided on an outer side of a vehicle via an adhesive layer (6) of an isocyanate group and attached to a body flange (9) of the vehicle. The trim frame and the gripping claws are formed of a thermoplastic elastomer, and an adhesive layer (7) having a thickness of 10 μm or more is provided between the trim frame and the adhesive layer, and the adhesive layer is formed of a thermoplastic olefin resin. To 100 parts by weight, 0.01 to 40 parts by weight of a copolymer of ethylene and a hydroxyl group-containing unsaturated compound, 0.01 to 5 parts by weight of an organotin compound and / or 0.01 to 0.01 parts by weight of a tertiary amine compound Automotive weather strip, characterized in that is constituted by an elastomer composition obtained by blending 20 parts by weight of elastomer component 1 to 200 parts by weight. 3. A trim body having a substantially inverted U-shaped cross section.
And a plurality of gripping claws (4) protruding from the inner wall of the trim body and a core metal (5) embedded in the trim body. An automotive weather strip, comprising a hollow seal portion (8) made of sponge rubber provided on an outer side of a vehicle via an adhesive layer (6) of an isocyanate group and attached to a body flange (9) of the vehicle. The trim body is composed of a thermoplastic elastomer composition comprising a mixture of a modified polyolefin resin (A) graft-modified with an unsaturated hydroxy compound and a partially crosslinked olefin polymer rubber (B). Automotive weather strip. 4. A trim body having a substantially inverted U-shaped cross section (2).
And a plurality of gripping claws (4) protruding from the inner wall of the trim body and a core metal (5) embedded in the trim body. An automotive weather strip, comprising a hollow seal portion (8) made of sponge rubber provided on an outer side of a vehicle via an adhesive layer (6) of an isocyanate group and attached to a body flange (9) of the vehicle. The trim skeleton is added to 100 parts by weight of a thermoplastic olefin resin, 0.01 to 40 parts by weight of a copolymer of ethylene and a hydroxyl group-containing unsaturated compound, 0.01 to 5 parts by weight of an organotin compound, and / or Tertiary amine compound 0.01-20
A weather strip for automobiles comprising an elastomer composition obtained by mixing 1 part by weight and 200 parts by weight of an elastomer component.