JP2003127897A - Automobile body structure reinforced by coat-type steel plate reinforcing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow easy mounting even at a manually-hard-to-mount position and achieve the reinforcement of an automobile body with a lighter material. SOLUTION: A room-temperature curing resin containing a mixture of main agent and curing agent is heated to 30-50 deg.C and applied to a position ion the automobile body to be reinforced in a certain range with a slit nozzle or a turning nozzle to form a reinforcing material. A second coating is applied on the coated film in a range narrower than a first range in such a manner that the edge of the reinforcing material is thinner than a central portion for a smaller level difference to prevent the deformation of a steel plate due to the hardening contraction of the reinforcing material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile body reinforced by applying a coating type reinforcing material.

[0002]

2. Description of the Related Art Reducing the weight of an automobile is an important issue,
Steel sheets used for automobiles have been thinned to the limit of safety and structural requirements. For this reason, in particular, a steel plate reinforcing material called a dent material is attached to the steel plate forming the outer shell of the automobile or heat-sealed to improve the rigidity.

[0003]

However, there are some places in the automobile manufacturing line where it is difficult for an operator to manually attach the molded reinforcing material. Further, for the purpose of reducing the vehicle weight, a lighter weight reinforcing material is required. INDUSTRIAL APPLICABILITY The present invention achieves reinforcement of an automobile body with a lightweight material, which enables easy attachment work even at a difficult place to attach.

[0004]

According to the present invention, a room temperature hardening type resin is used as a steel plate reinforcing material and is applied to the surface of the steel plate at a constant width to give rigidity to a steel plate which is thinned to the limit. .

The main component of the reinforcing material for steel sheet used is a room temperature curing two-component type coating material such as polyurethane resin or epoxy resin, but the type of resin is not particularly limited. Polyurethane resin is cured by a reaction between an isocyanate and an active hydrogen compound, and as the isocyanate, tolylene diisocyanate (TDI), methylene diphenyl diisocyanate (MDI), isophorone diisocyanate (IPDI), xylene diisocyanate (XDI), water addition For example, MDI (H ₁₂ MDI). The epoxy resin is bisphenol A type, bisphenol F type, urethane-modified epoxy resin, or the like.

As the curing agent, polyamines, polyamides, polyols and the like can be used, and examples of amines include aliphatic amines, aromatic amines, acid anhydrides, urea resins, melamine resins and phenol resins. Aliphatic amines include diethylenetriamine (DTA), triethylenetetramine (TETA) and the like, and adducts having an amino group at their ends, and aromatic amines include metaphenylenediamine (MPD) and diaminodiphenylmethane (DDM). , Diaminodiphenyl sulfone (DDS) can be used.

Fillers, which are well known as additives for paints, are added as necessary. Fillers include various extender pigments and coloring pigments such as calcium carbonate, barium sulfate, talc, clay, kaolin, zinc white, titanium oxide, silica, alumina, plastic balloons, glass balloons, ceramic balloons, silica balloons, shirasu. Lightweight and low specific gravity fillers such as balloons can be used. Other additives include a dehydrating agent, a hygroscopic agent, an anti-sagging agent, a thixotropic additive, a dispersant, an ultraviolet absorber, a high boiling point solvent for improving coating workability, a plasticizer, and an oil surface adhesion effect increasing effect. Powder rubber, acrylic resin for increasing the steel plate reinforcing effect, etc. are added as necessary. The addition amount of these additives is appropriately 0 to 10% by mass.

In order to improve the coating workability of the coating type steel plate reinforcing material, it is necessary to reduce the viscosity of the epoxy resin coating material, and for this purpose, it is desirable to add an epoxy reactive diluent. Various diluents are known, and the diluent is not limited to a specific diluent.

The coating type steel plate reinforcing material is manufactured by using a conventionally known disperser for paints, and a disperser such as a dissolver, a planetary mixer, an open kneader, a vacuum kneader, a roll mill, a ball mill or a Glen mill can be used. . The mixing method of the main component of the room temperature curable paint and the curing agent is
There is a method of mixing these two in an equivalent ratio in advance, and feeding this by pressure and applying it with a coating machine. In this case, there is no problem if the application work is continuously performed, but during lunch break or other If there is a line stop for some reason, the curing reaction may proceed in the pipe and plug the pipe. The main agent and the curing agent are pressure-fed by separate pipes, a well-known two-liquid mixer such as a collision type mixer (static mixer) is placed immediately before the coating machine, and the reinforcing material mixed at the reaction equivalence ratio is applied. There is a way. In this case,
Only the part ahead of the mixer needs to be washed, and plugs in the pipes and coating machine can be prevented.

The reinforcing material composed of the room temperature curable paint has a problem that it has high viscosity and poor workability in coating. Further, as shown in the graph of the film thickness of the reinforcing material and the reinforcing performance, the room temperature curable resin reinforcing material needs to be applied to a certain thickness or more in order to exert the reinforcing function. In order to apply a coating film having a constant thickness on the surface of a steel sheet, extrusion coating is used, which is disclosed in JP-A-11-179257 and JP-A-11-235.
A known swirl nozzle or the like that moves while drawing a known swirl orbit disclosed in Japanese Patent No.

Further, the piping and the coating nozzle are set at 30 to 50 ° C.
By heating and coating on the reinforcing material, it is possible to reduce the viscosity of the reinforcing material, form a uniform and smooth coated surface of the reinforcing material, and obtain stable quality and reinforcing effect. When the heating temperature is lower than 30 ° C., the viscosity is not sufficiently lowered, and when the heating temperature is higher than 50 ° C., the curing reaction is promoted and the reinforcing material may gel before coating.

An example of the coating pattern when the swirl nozzle is used is, as shown in FIG. 4, that the swirl width and the moving speed of the swirl nozzle are appropriately determined so that a coating film having a predetermined film thickness can be obtained. , The nozzle is swiveled to apply a uniform width. The next coating film is applied side by side on the formed coating film, and is applied again to the central portion of the formed coating film with a swirling nozzle. The cross-sectional shape of the coating film is shown in FIG. The step 3 is gentle. A thicker coating film in the central portion of the upper layer is more effective in relaxing the occurrence of strain than the coating film thickness in the lower layer. The change of the coating pattern can be freely set by the coating robot. When applying using a slit nozzle, the coating thickness is determined and the coating material is ejected from the nozzle and moved at a constant speed to form a strip-shaped coating film on the steel plate surface.

[0013]

Example 1 100 parts by mass of a bisphenol F type epoxy resin having an epoxy equivalent of about 300, 50 parts by mass of an epoxy reactive diluent having an epoxy equivalent of about 250 as a main agent, and an amine adduct of diethylenetriamine (DTA) as a curing agent. 50 parts by mass of curing agent, calcium carbonate 300
30 parts by mass of the additive and 30 parts by mass of the additive are mixed and dispersed by a planetary mixer, the main agent and the curing agent are pressure-fed by an airless pump, and the main agent and the curing agent are mixed at a reaction equivalence ratio by a mixer arranged immediately before the nozzle, and piping and When the nozzle was heated to about 50 ° C. and applied to the rear gate panel 40, the trunk lid 41, and the rear fender panel 42 of the automobile body shown in FIGS. 1 and 2, sufficient rigidity was obtained, and the corrugated surface of the steel sheet, etc. was obtained. No deformation was observed.

[0014]

[Example 2] Coating was carried out in the same manner as in Example 1, and the coating film thickness was 0.5.
mm, coating with a swirl width of 40 mm, with the same coating film thickness and swivel width, with an overlapping portion of 20 mm, total width 60 mm
The first layer coating film, the first layer coating film is applied to the inner center portion of the first layer coating film with a coating thickness of 1.0 mm and a swirl width of 40 mm to obtain the second layer coating film on both sides 10 mm inside the first layer coating film. The same effect was obtained with the ones. Since the edge portion of the reinforcing material is thin, there is less risk of pulling and deforming the steel sheet when the reinforcing material cures and shrinks.

[0015]

Example 3 100 parts by weight of a bisphenol F type epoxy resin having an epoxy equivalent of about 300 as a main component, 50 parts by weight of an epoxy reactive diluent having an epoxy equivalent of about 250, and an amine adduct of diethylenetriamine (DTA) as a curing agent. 50 parts by mass of the curing agent, 300 parts by mass of calcium carbonate, 30 parts by mass of the additive are mixed by a planetary mixer, the main component and the curing agent and the additive are pressure-fed by an airless pump, and the main component is prepared by a mixer arranged immediately before the nozzle.
Mix the curing agent in the reaction equivalence ratio, and use about 50
When heated to 0 ° C. and applied to the door panel 43 shown in FIG. 1, sufficient rigidity was obtained.

[0016]

EFFECTS OF THE INVENTION The reinforcing structure of the present invention is applied with a room temperature curing type reinforcing material, and can be efficiently processed into a reinforcing structure even in a place where it is difficult to attach manually. The weight can be reduced as compared with the conventional molded reinforcing material.

[Brief description of drawings]

FIG. 1 is a side view of an automobile having a reinforced body.

FIG. 2 is a perspective view showing a reinforcing portion at a rear portion of an automobile.

FIG. 3 is a graph showing the relationship between the film thickness of the reinforcing material and the reinforcing property.

FIG. 4 is an explanatory diagram of a coating pattern.

FIG. 5 is a cross-sectional view of a reinforcing material.

[Explanation of symbols]

1 steel plate 2 Reinforcement material 3 steps

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B62D 25/16 B62D 25/20 G 25/20 C09D 201/00 C09D 201/00 B62D 25/10 D (72 ) Inventor Masamitsu Kawazoe 4-4-16 Isoyama, Suzuka-shi, Mie (72) Inventor Yoshiaki Watanabe 8-16-15 Toyoshima, Kita-ku, Tokyo Japan Special Paint Co., Ltd. Development Center (72) Inventor Akio Sato Tokyo 8-16-15 Toyoshima, Kita-ku Japan Special Paints Co., Ltd. Development Center (72) Inventor Hirofumi Kondo 8-16-15 Toyoshima, Kita-ku, Tokyo Japan Special Paints Co., Ltd. Development Center F-term (reference) 3D003 AA01 BB02 CA14 CA36 CA45 CA55 3D004 AA01 BA01 CA01 4J038 DA042 DA142 DA162 DB061 DB481 DG001 DH002 DJ012 JA21 JA42 KA03 KA08 PA18 PB07 PC02

Claims (3)

[Claims] 1. An automobile body structure in which a room temperature curable coating material is applied in a strip shape on an outer panel of an automobile and is cured and reinforced. 2. The automobile body structure according to claim 1, wherein an edge portion of the strip-shaped reinforcing material is thinner than a peripheral portion thereof. 3. The application part according to claim 1 or 2, which is a door panel, a floor panel, a front fender panel, a rear fender panel, an engine hood panel, a trunk lid, a rear gate panel, or a combination thereof. Car body structure.