JPH0642921Y2 - Weather strip - Google Patents

Description

[Detailed Description of the Invention] [Field of Business Use] The weather strip of the present invention is fitted and attached to a flange of a vehicle body opening portion of an automobile. More specifically, in the weather strip of the present invention, since the lip and the auxiliary lip are formed of a water-swelling composition containing an anticorrosive agent, the waterproof property and the anticorrosion property of the metal flange are simultaneously expressed. It exhibits excellent effects and expands its application as a weather strip for automobiles.

[Conventional technology]

BACKGROUND ART A weather strip for an automobile is fitted and attached to a body opening flange for the purpose of waterproofing, soundproofing and dustproofing.

FIG. 6 is a sectional view showing the structure of a conventional weather strip. As shown in FIG. 6, a conventional weather strip has a welt portion 7 having a core metal inside and a substantially U-shaped cross section, and a plurality of lip portions on both inner wall surfaces of the welt portion.
1.2.3 and 4 are projectingly provided, and a hollow seal member 8 is provided on the outer peripheral portion.
Is provided.

Conventional weather strips with the above structure have EPT (ethylene / propylene terpolymer rubber), CR (chloroprene rubber) or SBR (styrene
(Butadiene rubber) or the like as a main raw material, and is formed into a solid or sponge shape as required. As described above, the waterproof effect of the conventional type weather strip is insufficient because it is due only to the rubber elastic pressure.

Therefore, in FIG. 6, the water that has entered from the outside (in the direction of the arrow) passes through the contact surface between the auxiliary lip 5 and the lips 1 and 2 and the flange, and the space between the lips 1 and 2 and the welt portion 7 is increased.
Stays in the inner corner of the. Thus, the water accumulated in the weather strip becomes a factor that causes rust on the flange, and has a major drawback of corroding the flange over time.

By the way, the actual development Sho 59-4309, the actual development Sho 59-174913 and the actual development Sho
No. 60-28515 discloses a wind seal weather strip that uses a water-swellable material to improve the waterproof effect. This type of weather strip is intended to make the waterproof effect of the weather strip more complete by the waterproof effect due to the rubber elastic pressure and the water blocking effect due to self-volume expansion pressure by absorbing water. Similar to the conventional weather strip, it does not have anticorrosion property and has a major drawback that the flange portion corrodes over time.

[Problems to be solved by the present invention]

The present invention is intended to suppress the corrosion of the flange, which is a drawback of the conventional weather strip, and also to complete the waterproof effect which is the original purpose of the weather strip.

[Means for solving problems]

The above-mentioned problems can be solved by forming the lip that contacts the metal flange and the auxiliary lip with a water-swellable composition containing an anticorrosive agent.

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention.
The figure shows that the lips 1 and 2 abutting on the flange 9 and the auxiliary lip 5 are formed of a water-swellable composition containing an anticorrosive,
It is sectional drawing of the weather strip attached to the vehicle body flange of a motor vehicle door. FIG. 2 shows the lip substrates X and X '.
Notch members 10 and 10 'and auxiliary lip 5 which are integrally projected on the
FIG. 3 is a cross-sectional view of a weather strip formed from a water-swellable composition containing an anticorrosive agent and attached to a flange of an automobile trunk.

The water-swellable composition used in the present invention comprises 10 to 200 parts by weight of a super absorbent resin and 5 to 3 parts of a corrosion inhibitor for 100 parts by weight of a kind selected from rubber, a thermoplastic resin and a mixture thereof.
It is composed by blending 0 parts by weight, and when it comes into contact with water and the corrosion inhibiting effect on the metal, the hydrophilic part in the composition hydrogen bonds with water molecules, resulting in physical and chemical water absorption and hydration. As a result, it has the property of self-expanding.

[Action]

The operation of the weather strip of the present invention will be described with reference to the drawings.

FIG. 3 is a partially enlarged view of a cross section taken along the line AA of FIG. 5 showing the weather strip of the present invention attached to a vehicle body flange of an automobile door. Lips 1 and 2 and auxiliary lip 5 absorb water and expand. Shows the state. In FIG. 3, the auxiliary lip 5 and the lips 1 and 2 made of the water-swellable composition are
It rapidly absorbs water that has entered from outside the vehicle (in the direction of the arrow) and expands to several times its own volume. As a result, the intrusion of water into the vehicle is completely prevented by the synergistic effect of the rubber elastic pressure of the weather strip and the expansion pressure due to water absorption.

FIG. 4 is a partially enlarged view of a cross section taken along the line BB of FIG. 5 showing a state where the weather strip of the present invention is mounted on the flange 9 of the automobile trunk. The same action and effect as those of FIG. 3 are shown. Demonstrate.

However, the most important feature of the present invention is that the water-swellable composition forming the lip member has a rust preventive function. Therefore, the anticorrosive effect of the present invention will be discussed below.

The water-swellable composition according to the present invention includes, as a corrosion inhibitor, a metal corrosion inhibitor selected from the group consisting of a tungsten oxide salt, a phosphonate, an aminotrismethylenephosphonic acid, an organic phosphate and an amyphosphate. It is compounded. This metal corrosion inhibitor elutes as an aqueous solution in the presence of water, forms a thin film on the metal surface with which the weather strip is in contact, delays the progress of corrosion, and exhibits a rust preventive effect.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of a weather strip of the present invention mounted on a vehicle body flange of an automobile door.
In FIG. 1, reference numeral 7 denotes a solid rubber welt portion made of a conventional material having a core metal 6 inside and having a substantially U-shaped cross section. On the inner wall surface of this welt part, lip 1.2.3
And 4 are projected, and 1 and 2 of the lips are formed of a water-swellable composition containing an anticorrosive agent. 3 is a sponge rubber made of a conventional material, and 4 is a solid rubber made of a conventional material. Reference numeral 5 denotes an auxiliary lip, which is formed of a water-swellable composition containing an anticorrosive agent, and 8 is a hollow seal member formed of sponge rubber made of a conventional material.

FIG. 2 is a sectional view showing an embodiment of the weather strip of the present invention mounted on the flange of a car trunk.
In comparison with the embodiment of FIG. 1, the lips 1 and 2 have substrates X and X '.
And the notch members 10 and 10 ', and the protruding positions of the hollow seal member 8 and the auxiliary lip 5'are different.
In FIG. 2, the notch members 10 and 10 'and the auxiliary lip 5'are formed of a water-swellable composition containing an anticorrosive agent, and the lip substrates X and X'are made of a conventional material like the welt portion. Made of solid rubber.

The weather strip of the present invention is integrally molded by an extrusion molding method.

〔effect〕

In the weather strip of the present invention, the auxiliary lip and the lip made of the water-swellable composition are provided on the outer outer wall tip portion of the welt portion and the inner wall surface thereof, respectively, so that when water enters from the outside, , First, the auxiliary lip absorbs water and expands, and in addition to the waterproof effect due to the rubber elastic pressure, the waterproof effect due to the water absorption expansion pressure occurs as a synergistic effect to generate a sufficient waterproof effect, and further intrusion of water In that case, the lip provided on the inner wall surface of the welt portion also absorbs water and expands, so that the waterproof effect is completely achieved. Further, a metal corrosion inhibitor is blended in the lip and the auxiliary lip to prevent corrosion of the metal flange on which the weather strip is mounted. It has a remarkable effect. That is, the lip and the auxiliary lip absorb the water that tries to enter the vehicle from the weather strip mounting portion and self-expand in volume, and the expansion pressure makes the water stopping effect and the push-up waterproofing effect more complete, and at the same time,
The above-mentioned well-known examples, well-known technical means and citations, which prevent the corrosion of the metal surface by elution of the anticorrosive compounded therein to the metal surface in contact therewith by the water introduced into the seal member, It has a remarkable effect peculiar to the present invention which does not exist.

Furthermore, when the environment of the super absorbent polymer becomes dry, it gradually releases water, and by applying the property of returning to the original state, the anticorrosive agent dissolved in water at the time of water release is applied to the seal member surface. It is gradually moved again to replenish the anticorrosive agent at the metal contact part on the surface of the seal member,
It also has an effect.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 2 is a sectional view of a weather strip mounted on a vehicle body flange of an automobile door, and FIG. 2 is a weather strip mounted on a vehicle trunk flange. FIG. 3 is a partially enlarged view of a section taken along the line AA in FIG. 5, showing a state where the lip and the auxiliary lip in FIG. 1 absorb water and expand in volume. FIG. 4 is a partially enlarged view of a cross section taken along the line BB of FIG. 5, showing a state in which the notch member and the auxiliary lip of FIG. 2 absorb water and expand in volume. FIG. 5 is a schematic view of an automobile for explaining the mounting location of the present invention, and FIG. 6 is FIG.
It is a partial enlarged view of the prior art example which shows the A line cross section. 1.2.3.4 …… Lip, 5.5 ′ …… Auxiliary lip, 6 …… Core bar, 7 …… Welt part, 8 …… Hollow seal member, 9…
... Flange, 10, 10 '... Notch material, X, X' ... Lip base material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuji Yamamoto, Inventor, Yuuji Yamamoto, 2-2-11, Matsuhama-cho, Fukuyama-shi, Hiroshima Within Hiroshima Kasei Co., Ltd. (72) Hiroshi Tanaka, 1 in Nakashinri, Hashime-cho, Okazaki, Aichi Automobile Industry Co., Ltd., Passenger Car Technology Center (72) Inventor, Ryo Ashikawa, No. 1 Nakashiniri, Hashime-cho, Okazaki City, Aichi Prefecture Mitsubishi Motors Corporation, Passenger Car Technology Center, (72) Inventor, Tatsuo Ishida Nakashinri No. 1 Mitsubishi Motors Co., Ltd., Passenger Vehicle Technology Center (56) References JP-A-56-149483 (JP, A) JP-A-59-59539 (JP, A) Actual development: Sho-59-4309 (JP, A) U)

Claims (1)

[Scope of utility model registration request] 1. A welt portion having a core metal inside and having a substantially U-shaped cross section, a plurality of lips projecting from inner wall surfaces on both sides of the welt portion, and an outer outer wall surface of the welt portion. A weather strip having a water-swellable composition for improving the waterproof effect, which comprises a hollow seal member and an auxiliary lip provided at a tip of an outer outer wall of the welt portion, and at least one of the lips. And the auxiliary lip
To 100 parts by weight of one kind selected from rubber, thermoplastic resin and a mixture thereof, 10 to 200 parts by weight of super absorbent resin and tungsten oxide salt, phosphonate, aminotrismethylenephosphonic acid, organic phosphate ester and amylin A weather strip comprising a water-swellable composition obtained by compounding 5 to 30 parts by weight of a metal corrosion inhibitor selected from the group consisting of acid salts.