JPS6058024B2 - Heat-resistant insulation vibration damping treatment method for automobile sheet metal parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for allocating sheet metal parts of automobiles, and more particularly to a method for coating a two-layered sheet metal material for allocating parts of sheet metal parts that become relatively hot during driving.

Traditionally, processing methods for allocating metal plates, etc.
There have been known methods such as spraying coating material in the form of a paint, and heating and fusing sheet-like single layer material whose main component is a thermofluidic material such as bituminous material or petroleum resin. However, the coatings made using these known techniques exhibit dispersion properties only in a narrow temperature range, and particularly in high temperature ranges, the dispersion properties rapidly decrease, and the surface of the coating material becomes sticky due to the thermofluidic material. This causes defects such as deformation and contamination of objects that come into contact with it.

Therefore, the conventionally known coating method for distribution can only be used in extremely limited areas, and it is possible to obtain excellent distribution effects over a wide temperature range, and even in high temperature ranges, there is no tackiness etc. There is a strong desire for the development of a coating method that easily adapts to the irregularities of the substrate, adheres closely to the irregularities of the substrate, and allows for the distribution of automobile sheet metal parts with simple operations.
On the other hand, thermo-fluid coatings such as bituminous materials, synthetic rubbers, and petroleum resins can be used as a coating method for distribution that exhibits distribution effects in a wide temperature range and does not cause stickiness on the surface of the distribution material or deformation of the distribution material itself. A two-layer type allocation material and allocation consisting of a lower layer of a sheet-like material whose main components are a material and an inorganic filler, and an upper layer (restriction layer) whose main components are a thermosetting resin and an inorganic filler. A processing method has already been proposed by the inventor.

The coating method proposed earlier is advantageous in that it is adaptable to the irregularities of the metal plate substrate after molding and is inexpensive. It is much better than the conventional method, and the temperature range in which the allocation effect is exhibited has also been expanded. However, it has been recognized that the coating method proposed earlier has excellent improvements in workability, cost, and vibration damping effect in that the restraining layer is changed from a metal plate to an upper layer mainly made of thermosetting resin. However, it is still insufficient, especially when the upper layer hardens while being swollen due to the blistering phenomenon caused by water vapor generated from the lower layer during heat welding to the substrate, and the vibration damping effect peaks in a certain temperature range. There is a strong desire for new improvements in the areas that tend to be limited. In view of the current situation, the inventors of the present invention have conducted intensive research and have arrived at the present invention.The purpose of the present invention is to avoid any blistering phenomenon during heat-sealing to a substrate, and to achieve the control obtained. Provided is a heat-resistant insulation vibration damping treatment method for automobile sheet metal parts that does not exhibit adhesiveness on the surface of the vibration material, has high heat insulation properties, and can exhibit a constant high level of vibration damping performance over a wide temperature range from room temperature to 130°C. It's about doing.

The gist of the present invention is a composition A comprising a filler in a binder mainly composed of polyvinyl butyral and diallyl phthalate monomers, wherein the mixing ratio of polyvinyl butyral and diallyl phthalate monomers is 1:0 by weight. .5~
an upper layer consisting of the composition A, in which the ratio of the binder and the filler is 1:2.5 and the mixing ratio of the binder and the filler is 1:2 to 1:4 by weight; the binder mainly consisting of a bituminous material contains the filler a lower layer consisting of a composition B formed of a composition B and having a plurality of convex portions of an arbitrary shape on one or both sides of the sheet-like composition B; A damping material formed by laminating a plurality of convex surfaces of arbitrary shapes formed on one side and stacked in contact with each other is placed on an automobile sheet metal member and heated to 100 to 180°C, thereby applying heat to the automobile sheet metal member. A heat-resistant, heat-insulating, vibration-damping treatment method for automobile sheet metal parts that is fused together.

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The composition A used in the upper layer of the present invention is used in combination with the lower layer composition B in the form of a sheet, and acts as a constraining layer at room temperature to a relatively low temperature, and itself exhibits viscoelasticity at high temperatures. It is a unique damping layer that can exhibit a damping effect, and does not cause surface adhesion even at high temperatures around 150°C, and therefore does not contaminate floor mats or carpets.

The binder used in Composition A is composed of polyvinyl butyral and diallyl phthalate monomers. Polyvinyl butyral, as is known per se, is obtained by reacting polyvinyl alcohol obtained by saponifying polyvinyl acetate with butyraldehyde. It is a thermoplastic resin that contains a hydroxyl group and a small amount of acetyl group in its molecule and can form crosslinks when used in combination with a thermosetting resin monomer or by heat treatment.

The degree of polymerization is approximately 100-2000, and the softening point is 65-14.
It's 0℃. In the present invention, the degree of polymerization is 100 to 1000.
Those having a softening point of about 65 to 100°C can be preferably used. As is well known, diallyl phthalate monomer is a diallyl ester of orthophthalic acid and isophthalic acid, and has two double bonds in one molecule, so it easily reacts with the action of a catalyst or heat, resulting in changes in electrical properties and dimensions. A thermosetting resin with excellent stability, heat resistance, and chemical resistance.

The fillers may be those used in conventional vibration damping materials; the fibrous fillers include asbestos, glass fibers, bulb fibers, pulverized waste paper and synthetic fiber waste, etc., and the scale fillers include Examples of powdered fillers include mica powder and mica powder, as well as talc, barite, clay, calcium carbonate, magnesium carbonate, titanium oxide, silica, and sand, as well as quicklime, coloring agents, and industrial waste powder. Preferably, an inorganic fibrous filler, a scale-like filler, or a powdery filler with a high specific gravity can be used.

As the polymerization initiator mixed into the binder mainly composed of polyvinyl butyral and diallyl phthalate monomers, general organic peroxides may be used, such as t-butyl peroxybenzoate, benzoyl peroxide, methyl ethyl ketone peroxide, t-butyl peroctoate. etc., and may be selected depending on the heating temperature conditions. In one example of the method for producing composition A, powdered polyvinyl butyral is mixed into a liquid diallyl phthalate monomer, and the mixture is heated and stirred at 40 to 50°C to obtain a paste. First, a small amount of fibrous filler and quicklime are mixed into this mixture, then a large amount of scale-like filler and powder filler are mixed in, and the mixture is thoroughly kneaded using a kneading machine, and finally polymerization starts. Mix the agent. The kneading operation is preferably carried out within a range where the temperature of the kneaded material does not exceed 50°C. This composition is usually used after being rolled into a sheet and then trimmed to the shape of the application site. If the mixing ratio of polyvinyl butyral and diallyl phthalate monomer is less than 0.5 parts to 1 part of polyvinyl butyral, vibration damping properties in high temperature ranges will decrease and surface tackiness and deformation phenomena will occur. If the amount is 2.5 parts or more, the viscoelasticity in a high temperature range decreases, resulting in a decrease in vibration damping properties, which is not preferable.

In addition, the mixing ratio of the binder and filler is as follows: binder 1
When the amount is less than 2 parts per part, it is difficult to form into a thick sheet, and when it is more than 4 parts, the vibration damping effect is significantly reduced due to a decrease in viscoelasticity.

The composition B used for the lower layer of the present invention may have a conventionally known composition, but it is essential that it has a plurality of convex portions of arbitrary shapes on one or both sides.

Asphalts that can be used in Composition B1, that is, the lower layer, include straight asphalt, semiprone asphalt, and prone asphalt. Preferably, prone asphalt is used alone, or prone asphalt and straight asphalt are used in combination.

Synthetic rubbers or petroleum resins may be added to these bituminous materials. Examples of natural or synthetic rubber include natural rubber, butyl rubber, recycled butyl rubber, styrene-butadiene rubber, neoprene rubber, and the like.

Mineral fillers include asbestos, calcium carbonate,
There are talc, clay, etc. Furthermore, if hollow pigments are mixed in, the heat insulation properties will be significantly improved. The method for producing composition B is as follows:
Any conventionally known method may be used, which is a method in which a heated and molten binder and filler are kneaded, then extruded, cooled with water and rolled to a desired thickness, and the final step is formed into an arbitrary shape. However, the water used for cooling in this step is released as water vapor when the composition is placed on a sheet metal member and heat-fused, causing a blistering phenomenon.

However, when the composition B is used as a single layer sheet, the rate at which blistering occurs is low, and even if blistering occurs, it is unlikely to return to its original shape while the sheet metal member is left to cool, resulting in a problem. On the other hand, when the composition B is used as a lower layer in combination with an upper layer, blistering occurs frequently, and when the upper layer is a thermosetting material, the upper layer hardens while remaining blistered, which remains as an undesirable phenomenon. Therefore, in the present invention, in order to effectively volatilize water vapor into the atmosphere, a sheet made of the composition B is provided with convex portions of an arbitrary shape, and concave portions that are created by bringing the convex portions and the upper layer into contact are formed. This is a water vapor volatilization path. In the present invention, it is an essential condition that the convex portion and the upper layer are in contact with each other,
Convex portions may be provided on both sides of the sheet, and the base and the convex portions may be in contact with each other. The method for providing the convex portions on the sheet is simple; in the manufacturing process described above, a roll called an embossing roll is provided after the rolling roll, and the sheet is passed between the rolls. The total plan view area of the convex portions provided on the sheet made of composition B may be about 95 to 10% of the total plan view area of the sheet.

Further, the height of the convex portion is preferably about 10% or more of the thickness of the portion of the sheet that includes the convex portion. Furthermore, the capacity of the hollow part created in the concave part by contacting the convex part of the sheet with the upper layer is approximately 3, based on the capacity of the sheet including the hollow part.
% or more is fine. In cases other than the above-mentioned conditions, the recess may be closed during heat fusion, resulting in a bulging phenomenon. When placing a damping material consisting of two layers, an upper layer made of composition A and a lower layer made of composition B, it is sufficient to simply place it. There is no problem in temporarily fixing the upper and lower layers using an adhesive or mechanical operation. The heating temperature for heat-sealing the two-layer vibration damping material according to the present invention placed on a sheet metal member may be in the range of about 100 to 1800C, and if the line conditions of the automobile manufacturer are considered, it may be 130 to 150C. All you have to do is heat it up to about 3 degrees.

The vibration damping treatment method of the present invention is suitable for use in areas such as the side surfaces of floors where exhaust vibrators, which heat up during driving, are installed.

Embodiments of the present invention will be described in more detail with reference to Examples below. Naturally, the present invention is not limited to the following examples. Example Straight asphalt (60-80) 24 parts by weight, Prone asphalt (5 parts by weight)
~10) Heat and melt 65 parts by weight and mix thoroughly.

8 parts by weight of styrene-butadiene rubber latex and 3 parts by weight of petroleum resin are gradually added to the mixed asphalt, followed by sufficient heating and mixing to obtain a binder. To 100 parts by weight of the binder, 3 parts by weight of asbestos slag-5 (manufactured by Canada Lake Asbestos Co., Ltd.) and 4 parts by weight of talcum powder were added, and the mixture was extruded onto an endless belt rotating at a constant width using a heat-retaining kneader. Air blower,
2 by calender roll while cooling with water sprinkling or other means.
After rolling to rT1/m thickness, it is processed with an embossing roll, and the depth of the concave part made on the damping material is 0.8wn1 area is 45%
Embossed composition B with increased thickness to 2.3wn
A lower layer damping material was obtained. If you look at the shape of the lower layer damping material from the side where the convex part is, you can see that the independent cylindrical convex part with a diameter of 10 m is 2T vertically and horizontally! r! They are arranged in parallel at n intervals. 100 g of polyvinyl butyral (BL-2, manufactured by Sekisui Chemical Co., Ltd.) was mixed with 150 g of diallyl phthalate monomer (manufactured by Datpu Monomer Osaka Soda Co., Ltd.), and 45
The mixture was heated to °C and stirred. Next, 30 g of asbestos slag-5 (manufactured by Canadian Lake Asbestos Co., Ltd.) and 30 g of quicklime were mixed and stirred. Further, transfer this stirred mixture to a mixing roll, and add mica powder M-30 (manufactured by Takara Sangyo Co., Ltd.) while being careful not to let the temperature of the mixture rise above 50°C.
100 g and 585 g of barium sulfate were successively mixed. Finally, 5g of t-butyl peroxybenzoate is added and mixed until the thickness is 2mm. An upper layer damping material consisting of Composition A was obtained.
0.8? Composition B layer (lower layer) was placed on the uneven steel plate with the surface without the embossed convex portions in contact with each other, and then Composition A was placed on the uneven steel plate.
When the layer (upper layer) was placed so as to be in contact with the embossed convex portions of the lower layer and heated at 140'C for 5 minutes, it conformed to the irregularities of the steel plate and fused, and no blistering phenomenon was observed.

Claims (1)

[Claims] 1 Composition A comprising a filler in a binder mainly composed of polyvinyl butyral and diallyl phthalate monomers, wherein the mixing ratio of polyvinyl butyral and diallyl phthalate monomers is 1:0 by weight.
5 to 1:2.5, and a mixture ratio of the binder and the filler is 1:2 to 1:4 by weight. a lower layer consisting of a composition B containing a composition B and having a plurality of convex portions of an arbitrary shape on one or both sides of the sheet-like composition B; A damping material made by laminating a plurality of arbitrarily shaped convex surfaces formed on at least one side of the sheet metal member is placed on an automobile sheet metal member and heated to 100 to 180°C. A heat-resistant, heat-insulating, vibration-damping treatment method for automobile sheet metal parts, characterized by heat-sealing them.