JPH0732956A - Automobile damping member and its temporary fastening method - Google Patents

Abstract

PURPOSE:To provide an automobile damping member and its temporary fastening method which are made excellent in economy and operating performance in such a way that pressure sensitive adhesives and mold releasing paper which have formally been applied to all of the surfaces of the damping member, are saved, and stable heat resistance and adhesion are exhibited when fusion bonded. CONSTITUTION:When an automobile damping member comprising a pressure sensitive adhesive sheet bonded on the specified area of the fusion bonding type damping member, and an automobile clamping member are to be temporarily fastened prior to fusion bonding to an automobile steel plate surface, the pressure sensitive adhesive sheet is bonded on the specified area of the damping member so as to be temporarily fastened to the automobile steel plate surface. In this case, the aforesaid adhesive sheet includes 50 to 600 parts of asphalt by weight, which includes reaction groups, to 100 parts of liquid rubber by weight, and has an adhesion capacity of more than 2% to the total weight of the damping member at room temperatures, and also has an adhesion capacity of more than 5% to all of the areas of the damping member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping material for an automobile, which is used for heat-sealing a vibration damping material for an automobile to a necessary portion of the automobile to obtain a required damping action, and also When the heat-damping material for a vehicle is heat-sealed to a necessary portion of the vehicle, the temporary material for the vehicle vibration-damping material is used to temporarily and temporarily fix the heat-damping material at a predetermined position of the vehicle until heat-sealing. It concerns the stopping method.

[0002]

2. Description of the Related Art Conventionally, asphalt damping materials have been obtained by dispersing and kneading various fillers such as fibrous fillers, calcium carbonate and mica into molten asphalt, rolling the mixture into a sheet, and trimming it into an arbitrary shape. It is known.

This damping material is placed or temporarily fixed on a floor panel, a dash panel, a trunk room, or the like in an automobile coating line, and the asphalt damping material is thermally softened by passing through a heating / drying furnace of the coating line. , It exhibits vibration damping performance by heat-sealing to the steel plate surface. (For the vibration damping structure using this type of fusible insulator, see, for example, “Automotive Technology Handbook <Second Volume> Design Edition”, March 1991. 1st, 1st edition Japan Society of Automotive Engineers pp. 325-328 "5.6
There are some explanations in “Vibration isolation, sound insulation, and heat insulation”. ).

By the way, in the case of a horizontal place such as a floor panel of an automobile, it suffices to place the damping material on a necessary place. However, a dash panel, a fender panel or the like having a vertical surface or a standing surface having an angle close thereto. When attempting to heat-seal the vibration damping material, temporarily secure the vibration damping material at a predetermined place by some means and take measures to prevent the vibration damping material from slipping or dropping during heat fusion. There is a need.

Therefore, conventionally, a pressure-sensitive adhesive is applied to the entire back surface of the damping material, a release paper is attached to this, and the release paper is peeled off on the line side of the automobile, and then the standing surface of the automobile steel plate surface is removed. I was taking a temporary stop.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to save pressure-sensitive adhesive and release paper, which have been conventionally applied to the entire surface of a vibration damping material, and to provide stable heat resistance and adhesion during heat fusion. The purpose of the present invention is to realize a vibration damping material for automobiles that exhibits excellent properties and excellent workability, and a temporary fixing method thereof.

[0007]

[Means for Solving the Problems] In order to solve the above problems, as a result of intensive studies, the present inventors have found that instead of the pressure-sensitive adhesive that has been conventionally applied to the entire back surface of the damping material, The present invention is to develop a damping material using a pressure-sensitive adhesive sheet for temporary fixing having excellent adhesion and a temporary fixing method thereof, and the constitution of the present invention is as follows.

That is, in the vibration damping material for automobiles according to the present invention, asphalt is added in an amount of 50 to 60 to 100 parts by weight of liquid rubber having a reactive group at a required portion of the heat-sealing type vibration damping material.
An adhesive sheet having an adhesive ability at room temperature of 0% by weight, 2% or more with respect to the total weight of the damping material, and 5% or more with respect to the total area of the damping material is attached. It has a feature.

In addition, the method for temporarily fixing a vibration damping material for automobiles according to the present invention is a liquid rubber having a reactive group for temporarily fixing the heat-sealing type vibration damping material to the steel plate surface of the automobile. Adhesive sheet containing 50 to 600 parts by weight of asphalt with respect to 100 parts by weight and having an adhesive ability at room temperature of 2% or more with respect to the total weight of the damping material and 5% or more with respect to the total area of the damping material. Is attached to a required portion of the vibration damping material, and is temporarily fixed to the steel plate portion of the automobile by the adhesive ability of the adhesive sheet.

In the vibration damping material for automobiles and the temporary fixing method thereof according to the present invention, the damping material temporarily fixed is, for example,
It may be a conventionally known asphalt and a binder containing a synthetic resin as a main component and a filler as a main component, or a rubber-based heat-sealing type vibration damping material, and is not particularly limited. Further, it may be a single layer, or may be a multilayer damping material having a steel plate constrained layer or a resin constrained layer.

On the other hand, as the adhesive sheet for temporarily fixing the vibration damping material, one containing 50 to 600 parts by weight of asphalt to 100 parts by weight of the liquid rubber having a reactive group is used. Examples of the liquid rubber having a reactive group include liquid rubber in which a resin such as epoxy, acryl or urethane is mixed. Examples of the liquid rubber include polybutadiene having a reactive terminal hydroxyl group, polyisoprene, butadiene-isoprene copolymer, butadiene-styrene copolymer, butadiene-acrylonitrile copolymer and the like.

The asphalt that constitutes the damping material is
Straight asphalt, blown asphalt, rubber modified asphalt, or a mixture of these asphalts can be used.

When the amount of asphalt is less than 50 parts by weight with respect to 100 parts by weight of the liquid rubber having a reactive group, the adhesiveness of the adhesive sheet is poor, and even when the damping material is heat-sealed, only the adhesive sheet portion is left untouched. There is a fear that the control performance of the damping material may be deteriorated due to fusion.

On the other hand, if the amount of asphalt exceeds 600 parts by weight with respect to 100 parts by weight of the liquid rubber having a reactive group, the heat resistance of the pressure-sensitive adhesive sheet is poor, and the vibration damping material is used in a coating film drying furnace in an automobile coating line. 12 when heat-sealing
Although heat of 0 to 180 ° C is applied, the adhesiveness of the pressure-sensitive adhesive sheet decreases before the damping material is fused, and the damping material is displaced or dropped and melts in place. You may not be able to wear it.

As a curing agent for curing the liquid rubber having a reactive group, an organic polyisocyanate compound can be exemplified. This is an organic compound having two or more isocyanate groups in one molecule. Further, a compound in the form of a prepolymer having an isocyanate group at the terminal, which is obtained by previously reacting a polyol with a polyisocyanate, may be used.

Further, as other additives, water absorbing materials such as quick lime and silica gel, coloring agents such as titanium white and carbon black, calcium oxide and the like can be used.

In the present invention, in order to produce an adhesive sheet to be attached to a required portion of a vibration damping material, the above-mentioned various compounds are mixed and dispersed by a known method such as a dissolver, a Banbury mixer, a planetary mixer, an open kneader, a vacuum kneader and the like. After the mixture is dispersed and kneaded by a machine, a pressure sensitive adhesive sheet having a desired thickness is made by a rolling machine such as a calender roll, and release paper is attached.

Next, the pressure-sensitive adhesive sheet obtained above is cut according to the area of the damping material to be temporarily fixed, and the release paper on one side is peeled off in advance and attached to a desired portion of the damping material. Alternatively, when the damping material is applied to the body of the automobile, the adhesive sheet is attached to the damping material, and then the release paper on the other side is peeled off.

In this case, the position where the adhesive sheet can be attached is determined by the shape, weight and area of the damping material, and it is not always necessary to temporarily fix it at one place, but the importance of the adhesive sheet is It is necessary to make it 2% or more of the weight of the material and 5% or more of the area. That is, when the damping material sheet is not more than 2% by weight of the damping material or not less than 5% of the area, the adhesiveness is insufficient and the damping material is displaced or dropped from a predetermined position before heat-sealing. There is a risk of

[0020]

EXAMPLES The following examples are provided for a more detailed understanding of the present invention. Naturally, the invention is not limited to the following examples only.

Example 1 50 parts by weight of blown asphalt was melted and softened to 100 parts by weight of a urethane resin-containing liquid rubber, a polyisocyanate compound was added and mixed and stirred by an open kneader, and a calender roll had a thickness of 2 mm. Then, for an asphalt damping material having an area of 9600 mm ² and a weight of 300 g, the area was 480 mm ² (5% for the damping material) and the weight was 6 g (2% for the damping material). One piece of the cut adhesive sheet was attached to the center of the damping material.

Example 2 600 parts by weight of blown asphalt was melt-softened to 100 parts by weight of urethane resin-containing liquid rubber, a polyisocyanate compound was added, and the mixture was stirred with an open kneader.
After obtaining a pressure-sensitive adhesive sheet having a thickness of 2 mm with a calender roll, for an asphalt damping material having an area of 9600 mm ² and a weight of 300 g, an area of 480 mm ² (5% with respect to the damping material) and a weight of 6 g (vibration damping) One piece of the pressure-sensitive adhesive sheet cut to a size of 2%) was attached to the center of the damping material.

Comparative Example 1 40 parts by weight of blown asphalt was melted and softened to 100 parts by weight of a urethane resin-containing liquid rubber, a polyisocyanate compound was added and mixed and stirred by an open kneader, and a calender roll was used to form an adhesive sheet having a thickness of 2 mm. Then, for an asphalt damping material having an area of 9600 mm ² and a weight of 300 g, the area was 192 mm ² (2% for the damping material) and the weight was 15 g (5% for the damping material). One piece of the cut adhesive sheet was attached to the center of the damping material.

Comparative Example 2 650 parts by weight of blown asphalt was melt-softened to 100 parts by weight of a urethane resin-containing liquid rubber, a polyisocyanate compound was added, and the mixture was stirred with an open kneader.
After obtaining a pressure-sensitive adhesive sheet having a thickness of 2 mm with a calender roll, for an asphalt damping material having an area of 9600 mm ² and a weight of 300 g, an area of 192 mm ² (2% with respect to the damping material) and a weight of 15 g (vibration damping). One piece of the pressure-sensitive adhesive sheet cut to a size of 5%) was attached to the center of the damping material.

Test method (1) JASO (Japanese automobile standard) M389-88
According to the method specified in 5.4 Thermal fluidity of "Asphalt sheet", the test was conducted by sticking it on a steel plate without bending the upper part of the damping material in this test.

That is, as shown in each of the Examples and Comparative Examples, an asphalt damping material having an area of 9600 mm ² and a weight of 300 g was used, whereas the area of the embodiment was 480 m.
m ² (5% for damping material) and weight 6 g (2% for damping material), in the case of the comparative example 192 mm ² area (2% for damping material) and weight 15 g (damping material) 5 for wood
Each piece of the pressure-sensitive adhesive sheet cut to the size of (%) was attached to the center of the damping material as a test piece, which was temporarily fixed to a steel plate inclined at 75 degrees and tested.

(2) Resonance method (Published by Japan Society for Acoustic Materials)
“Refer to“ Noise Countermeasure Handbook ”, page 438),
The loss coefficient η was measured at each temperature of 20 ° C, 40 ° C, and 60 ° C. It is said that the larger the value of this loss coefficient η, the greater the damping effect, and that if it is 0.05 or more, there is a damping effect. As the test piece, a 2 mm-thick asphalt damping material was heat-bonded to a 0.8 mm steel plate for an operator through each adhesive sheet. The results are shown in Table 1.

[0028]

[Table 1]

As is clear from the results shown in Table 1, in Examples 1 and 2 of the present invention, there was little sagging and the loss coefficient η had a large value, and the damping effect was sufficient. there were. On the other hand, in Comparative Example 1, since the asphalt content in the liquid rubber was too small, the adhesiveness of the adhesive sheet was poor and the amount of sag was large.
Moreover, in Comparative Example 2, since the asphalt content relative to the liquid rubber was too large, the heat resistance of the pressure-sensitive adhesive sheet was inferior, and the pressure-sensitive adhesive ability of the pressure-sensitive adhesive sheet decreased before the vibration damping material was fused. Was becoming.

[0030]

According to the vibration damping material for automobiles and the temporary fixing method for the same according to the present invention, the pressure sensitive adhesive is applied to the entire back surface of the conventional damping material and the release paper is applied to the entire back surface. Saves resources, and
The damping performance of the vehicle in the vertical direction is equal to or higher than that of conventional damping materials. Further, in comparison with the case where the entire back surface is pasted with a pressure-sensitive adhesive, the temporary fixing method according to the present invention can be applied easily even on a complicated curved surface, so that it has excellent workability. Be brought.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Urakawa 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd.

Claims (2)

[Claims] 1. A required portion of a heat-sealing type damping material contains 50 to 600 parts by weight of asphalt with respect to 100 parts by weight of a liquid rubber having a reactive group, and 2% or more based on the total weight of the damping material. And a damping material for an automobile, which is obtained by laminating an adhesive sheet having an adhesive ability at room temperature of 5% or more with respect to the entire area of the damping material. 2. When temporarily fixing a heat-sealing type vibration damping material to the surface of an automobile steel plate, 50-600 of asphalt is added to 100 parts by weight of a liquid rubber having a reactive group.
Attaching an adhesive sheet having a weight ratio of 2% or more with respect to the total weight of the vibration damping material and 5% or more with respect to the total area of the vibration damping material to a required portion of the vibration damping material, A method for temporarily fixing a vibration damping material for automobiles, which is temporarily fixed to a steel plate portion of an automobile by the adhesiveness of the adhesive sheet.