JPH01186483A - Method of reinforcing car outside plating - Google Patents

Abstract

PURPOSE: To improve the workability for reinforcing a vehicle outside plate by attracting and sticking a magnetized molded reinforcing material to the inside of the outside plate, then heating and hardening the reinforcing material. CONSTITUTION: A reinforcing material includes a main component selected from a group of a synthetic resin and synthetic rubber, and it contains one or two or more kinds of components selected from a group of a hardening agent, a vulcanizing agent, an accelerator, a foaming agent, a filler and an additive. One or two or more kinds of magnet materials of about 5-80 wt.% selected from a group of a ferrite magnet, a rare earth magnet and an Alnico magnet are mixed in the reinforcing material to magnetize the reinforcing material. This is molded into a sheet shape, and the reinforcing material is magnetized under the existence of magnetic field. A magnetized molded reinforcing material 20 is molded into a desired shape for a vehicle outside plate 10, and it is attracted and stuck to the inside of the vehicle outside plate 10. The molded reinforcing material 20 is fixed to the inside of the vehicle outside plate 10 by heating and hardening the molded reinforcing material 20.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for reinforcing vehicle outer panels, such as vehicle doors, bonnets, trunk lids, fenders, and roofs.

<Conventional technology and its problems> Conventionally, as a reinforcement method for reinforcing the outer panel of a vehicle, when assembling the vehicle, the outer panel of the vehicle is treated with anti-rust oil and then molded reinforcing material is applied. The reinforcing material is crimped onto the vehicle outer panel, and the molded reinforcing material is subjected to surface treatments such as degreasing and chemical conversion in an uncured state. Next, the molded reinforcing material is heated and hardened during baking of the electrodeposition paint,
There are ways to reinforce the outer skin of a vehicle. However, in the conventional method, the molded reinforcing material is only crimped onto the vehicle outer panel that has been treated with anti-corrosion oil, so it is impossible to temporarily fix the molded reinforcing material until it hardens. etc., the molded reinforcing material may shift from its predetermined position or fall off. In addition, the hot water shower used during surface treatment hits the molded reinforcing material, causing it to shift and fall off due to hydraulic force.Furthermore, during heat curing, the oil level The reinforcing material does not adhere to the surface of the material, and may shift or fall off due to its own weight.

Furthermore, when the reinforcing material is crimped onto the outer steel plate of a vehicle, its adhesion to the oil surface becomes extremely poor in the winter, so it cannot be affixed unless it is kept warm, reducing work efficiency.

Furthermore, since the reinforcing materials for vehicle steel outer panels are hidden inside, it is difficult to detect misalignment or falling off, and repair methods are difficult. Therefore, a method for reinforcing the outer vehicle panels that has excellent adhesion and adhesion properties is desired. It is rare.

<Object of the Invention> An object of the present invention is to provide a method for reinforcing a vehicle outer panel with good workability.

Another object of the present invention is to provide a method for reinforcing a vehicle outer panel that significantly improves the adhesion between the vehicle outer panel and a molded reinforcing material.

Means for Solving the Problems> According to the present invention, there is provided a method for reinforcing a vehicle outer panel, which comprises: adhering and pasting a magnetized molded reinforcing material to the inside of the outer panel;
A method is provided which comprises then heating and curing the reinforcing material.

The present invention will be explained in more detail below.

In the present invention, a magnetized molded reinforcing material is used to reinforce a vehicle skin. The reinforcing material used in the present invention preferably contains a main component selected from the group consisting of synthetic resins and synthetic rubbers. For example, the synthetic resins include epoxy resins, acrylic resins, urethane resins, phenolic resins, and diallyl phthalate resins. , urea, melamine resin, polyamide resin, vinyl chloride resin, polyethylene resin, polycarbonate resin, fluororesin, polypropylene resin, silicon resin, polyester resin, styrene resin, polyacetal resin, vinyl acetate resin, phenoxy resin and their copolymer resins, etc. , Synthetic rubbers include butyl rubber, butadiene rubber, isoprene rubber, chloroprene rubber, acrylic rubber, isobutyne-isoprene rubber, nitrile-
Butadiene rubber, nitrile-chloroprene rubber, pyridine-butadiene rubber, styrene-butadiene rubber, styrene-chloroprene rubber, styrene-isoprene rubber,
Preferred examples include urethane rubber, silicon rubber, chlorosulfonated polyethylene, natural rubber, ethylene-propylene rubber, nitrile rubber, polyether rubber, fluororubber, and polysulfide synthetic rubber.

Furthermore, one or two selected from the group consisting of a curing agent, a vulcanizing agent, an accelerator, a foaming agent, a filler, and an additive is added to the reinforcing material.
It is preferable to contain at least one component, and as the curing agent, a known agent for curing synthetic resins can be used, and it is preferable to select it appropriately depending on the functional group of the synthetic resin. For example, dicyandiamide, imidazole derivatives,
Examples include dihydrands, ureas, guanidines, polyamines such as hexamethylenetetramine, organic acids, organic peroxides, etc. As the vulcanizing agent, a known agent that vulcanizes synthetic rubber can be used. Examples of accelerators include sulfur, organic sulfur-containing compounds, metal oxides, organic peroxides, oxidative vulcanizing agents, and alkylphenol resins. Examples of accelerators include aldehyde ammonia, thiazole, and aldehyde amine. , sulfenamide series, thiourea series, thiuram series, guanidine series,
Examples of foaming agents include dithiocarbamate-based and xanthate-based foaming agents, and examples of foaming agents include azo compounds (e.g., azodicarbonamide, azodihexahydrobenzodinitrile, etc.) and hydrazide compounds (e.g., benzenesulfohydrazide, etc.). Examples of fillers include calcium carbonate, clay, talc, slaked gypsum, metal powder, zinc white, titanium oxide, silicon oxide, carbon, etc., and additives include Examples include activators, diluents, anti-inflammatory agents, moisture absorbers, and the like.

Furthermore, in order to magnetize the reinforcing material, it is particularly preferable to add 5 to 80% by weight of one or more magnet materials selected from the group consisting of ferrite magnets, rare earth magnets, and alnico magnets to the reinforcing material. It is desirable to mix the ferromagnetic powder as a fine powder using a roll mill, mixer, etc. until it becomes homogeneous.

In this case, it is preferable to mix a surfactant such as oleic acid or linoleic acid, so that the reinforcing material and the ferromagnetic fine powder can be easily mixed.

Thereafter, it is formed into a sheet, and the reinforcing material is magnetized in the presence of a magnetic field. Magnetization can be performed using a commercially available magnetizer. At this time, if the content of the magnetic material is less than 5% by weight with respect to the reinforcing material, adsorption and adhesion to the vehicle outer panel cannot be improved, and the content of the magnetic material is 80% by weight. If the amount exceeds % by weight, there is a risk that the performance as a reinforcing material may be lost. Further, when the reinforcing material made magnetic by heat-treating the vehicle outer panel is cured, the large amount of magnetic material makes the cured product brittle and reduces its durability against vibrations, which is undesirable.

The method of the present invention can be applied to reinforcing the outer panels of all types of vehicles such as automobiles and trains. For example, Figure 1 shows a front view of a vehicle outer panel with reinforcing material adsorbed and pasted on the vehicle outer panel,
FIG. 2 shows a side view of a vehicle outer panel with a reinforcing material adsorbed and attached to the vehicle outer panel. Next, the present invention will be explained in detail using FIGS. 1 and 2.

As a method for reinforcing a vehicle outer panel according to the present invention, for example, a magnetized molded reinforcing material 20 is molded into a desired shape on the vehicle outer panel 10, and then the molded reinforcing material 20 is attached to the vehicle outer panel 10.
Adsorb and paste on the inside of.

At this time, any method can be used for adsorption and attachment as long as the vehicle outer panel and the molded reinforcing material are adsorbed and attached. After that, it is preferable to perform surface treatments such as degreasing, chemical conversion, electrodeposition coating, and hot water shower spraying. Then, the molded reinforcement material is preferably heated to 110°C to 2°C.
The molded reinforcing material is fixed to the inside of the vehicle outer panel by heating and curing in a range of 20°C.

The above FIGS. 1 and 2 are, of course, only one example, and the method of the present invention is not limited to FIGS. 1 and 2.

<Effects of the Invention> According to the present invention, a magnetized molded reinforcing material can be adsorbed and attached to a predetermined position of a vehicle outer panel with good workability, and the vehicle outer panel can be reinforced.

<Example> The effects of the present invention will be explained in more detail with reference to Examples and Comparative Examples.

(Example 1) 100 parts of epoxy resin, 10 parts of dicyandiamide, 5 parts of curing catalyst, 5 parts of nitrile-butadiene rubber, and 10 parts of carbon were added to a vehicle outer panel of 200 mm x 300 nm x 0.8 mm.
A magnetized reinforcing material obtained by homogeneously mixing 130 parts of ferrite magnet powder, and 0.5 parts of oleic acid in a roll mill was molded into a size of 50 mm x 100 rrtn x 2 mm, and then applied to the outer panel of the vehicle at 5°C and 20°C. .

Test piece 1 was produced by adsorption and attachment under conditions of 30°C. Next, using test piece 1, an impact test, a vertical drop test, a hot water shower resistance test, and a displacement test during heat curing were conducted. Impact test is JASOM323-7
7 (Car body sealant) Performed according to 9-26, and the vertical drop test was performed by dropping test piece 1 vertically for 10 minutes from a height of 100 m.
It was dropped several times to check for shedding.

In the hot water shower resistance test, a shower nozzle was installed so that the hot water shower hit test piece 1 vertically, and the conditions were as follows: hot water temperature: 50°C, water pressure: 1.0 kg/cnY, shower time: 60 seconds, distance: 30 m or 60 cm I went downstairs. In the displacement test during heating and curing, the test piece 1 was fixed in a vertical position, heated and cured at 170° C. for 30 minutes, and the displacement of the reinforcing material was measured.

The results are shown in Table 1.

(Comparative Example 1) Instead of the magnetized reinforcing material used in Example 1, a molded sheet reinforcing material with the trade name "CEMEDINE TK" was used.
Everything was carried out in the same manner as in Example 1 except that 902J (manufactured by Cemedine Co., Ltd.) was used. The results are shown in Table 1.

As is clear from Table 1, Test Piece 1 using the vehicle outer panel reinforcing method of the present invention performed well in all tests.

[Brief explanation of the drawing]

FIG. 1 is a front view of a vehicle outer panel with a reinforcing material adsorbed and attached to the vehicle outer panel, and FIG. 2 is a side view of a vehicle outer panel with a reinforcing material adsorbed and attached to the vehicle outer panel. 10...Vehicle outer plate, 20...Magnetized molded reinforcement material. Patent applicant: Cemedine Co., Ltd., Cem Corporation, patent attorney
Kanesaka Ido Sakai
- Shigeru Kanesaka 1o
- Outer edge of the pedestal 20 parts 1 stone prisoner award 4 - I shigore r hino ♂ C Akishi h'zu (1 [Fig. 1 Fig. 2

Claims (1)

[Claims] A method for reinforcing a vehicle outer panel, characterized by adhering and pasting a magnetized molded reinforcing material to the inside of the outer panel, and then heating and hardening the reinforcing material. Method.