JP2009183916A - Assembly method of car body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembly method of car body in which a body assembly is performed by applying a sealing material on a step of a sub-assembly before the body assembly and, thereafter, performing chemical conversion treatment and electrodeposition. <P>SOLUTION: In the assembly method of car body, the body assembly is performed by applying the sealing material on the step of the sub-assembly before the body assembly and, thereafter, performing chemical conversion treatment and electrodeposition, wherein a plastisol sealing material composition containing a conductive metal oxide in a main component is used as the sealing material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for assembling a vehicle body, and in particular, relates to a method for assembling a vehicle body in which a sealing material is applied at a stage of sub-assembly before body assembly, and thereafter, chemical conversion treatment and electrodeposition coating are performed.

Regarding the assembly of the vehicle body, it is generally known that a steel sheet used in a vehicle forms a chemical conversion film and an electrodeposition coating film on the surface of the steel sheet through a chemical conversion treatment step, and prevents deterioration due to rust, FIG. As shown in Fig. 4, the parts are manufactured by pressing, sub-assembled, and then the body is assembled using the sub-assembled parts to assemble the vehicle body, then chemical conversion treatment and electrodeposition coating are performed, and then the sealing material is applied. It is common to apply (Patent Document 1).
In addition, as a sealing material for vehicles, there exists a sealing material composition using a vinyl chloride resin, an acrylic resin, an acrylate resin, a urethane resin, an epoxy resin, rubber, a crosslinked polyether resin, or the like as a main component.
Japanese Patent Laid-Open No. 08-010694

  Most plastisol sealing materials are generally applied after electrodeposition coating. There is also a sealing material that is applied before chemical conversion treatment, but in this case, the surface of the plastisol sealing material and the boundary between the plastisol sealing material and the steel plate are not formed with a chemical conversion film or electrodeposition coating, so rusted steel plate This is because there is a problem that the corrosion deterioration of the steel occurs. For this reason, it is inevitable to apply the sealing material after the assembly of the vehicle body, it is difficult to perform the sealing work, the working efficiency is poor, and there is a problem in its reliability.

The present inventors apply a sealing material at the stage of sub-assembly before body assembly, then perform chemical conversion treatment and electrodeposition coating, and realize a method for assembling the vehicle body that performs body assembly before steel plate treatment. As a result of intensive investigations on plastisol sealing materials that do not cause corrosion deterioration of the steel sheet due to rust even when applied to rust, conductive metal oxides are included in the main component of the sealing material, which is not possible with conventional sealing materials. It has been found that a chemical conversion film can be formed on the surface of the sealing material that has been made possible and on the boundary between the sealing material and the steel plate.
The method of assembling the vehicle body of the present invention is based on such knowledge. As described in claim 1, a sealing material is applied at the stage of sub-assembly before body assembly, and then chemical conversion treatment and electrodeposition coating are performed. A method of assembling a vehicle body for performing body assembly, wherein a plastisol sealing material composition containing a conductive metal oxide in a main component is used as the sealing material.
The vehicle body assembly method according to claim 2 is the vehicle body assembly method according to claim 1, wherein the main component is vinyl chloride resin, acrylic resin, acrylate resin, urethane resin, epoxy resin, rubber, cross-linking. It comprises at least one kind of polyether resin.
A method for assembling a vehicle body according to claim 3 is the method for assembling a vehicle body according to claim 1 or 2, wherein the conductive metal oxide is conductive zinc oxide.
The method for assembling the vehicle body according to claim 4 is the method for assembling the vehicle body according to any one of claims 1 to 3, wherein the conductive metal oxide is contained in 100 parts by weight of the plastisol sealing material composition. 3 to 20 parts by weight.

  According to the method for assembling a vehicle body of the present invention, a chemical conversion film can be formed on the surface of the sealing material, which has been impossible with conventional sealing materials, or on the boundary between the sealing material and the steel plate. After coating, chemical conversion treatment is possible, and it is possible to realize a vehicle body assembly method in which a sealing material is applied at the sub-assembly stage before body assembly, and then chemical conversion treatment and electrodeposition coating are performed to perform body assembly. . In addition, since a chemical conversion film is formed on the sealing material composition, an electrodeposition coating can be easily placed, so that the problem of adhesion between the sealing material composition and the intermediate coating and top coating can be solved.

Below, the assembly method of the vehicle body of this invention is demonstrated in detail.
According to the present invention, as shown in FIG. 1, parts are manufactured by pressing, sub-assemblies are performed, and when this sub-assembly is completed, a sealing material is applied to each part, and then chemical conversion treatment, electrodeposition is performed. After painting, body assembly is then performed to assemble the car body.
The plastisol sealing material composition used in the method for assembling a vehicle body of the present invention is characterized in that the main component contains a conductive metal oxide, and the main component includes a vinyl chloride resin, an acrylic resin, and an acrylate. Resins, urethane resins, epoxy resins, rubbers, cross-linked polyether resins and the like can be mentioned.

  When vinyl chloride resin is the main component, polyvinyl chloride, vinyl chloride vinyl acetate copolymer and other copolymers, vinyl chloride resins such as vinylidene chloride resin, phthalates such as DINP and DOP, mineral oil, Phosphate esters such as alkyl diphenyl phosphate, chlorinated paraffin, low molecular weight epoxy, low molecular weight polyester, plasticizers such as alkyl alcohol, calcium carbonate, magnesium carbonate, magnesium silicate, calcium silicate, mica, calcined clay, barium sulfate, calcium sulfate If necessary, a diluent, a stabilizer, a colorant, a moisture absorbent, etc. are added to an adhesive such as an epoxy resin and a urethane resin.

  When acrylic resin is a main component, acrylic resin such as alkyl acrylate ester (alkyl is, for example, methyl, ethyl, butyl, 2-ethylhexyl), methacrylic acid alkyl ester (alkyl is, for example, methyl, ethyl, butyl, lauryl stearyl) Phthalates such as DINP and DOP, mineral oil, phosphate esters such as alkyl diphenyl phosphate, chlorinated paraffin, low molecular weight epoxy, low molecular weight polyester, plasticizers such as alkyl alcohol, calcium carbonate, magnesium carbonate, magnesium silicate Add diluents, stabilizers, colorants, moisture absorbers, etc., as necessary, to fillers such as calcium silicate, mica, calcined clay, barium sulfate, calcium sulfate, and adhesives such as epoxy resin and urethane resin. To do.

  When acrylate resin is the main component, acrylate resin such as glycidyl (meth) acrylate, peroxide polymerization initiator, polymerization initiator such as azo polymerization initiator, calcium carbonate, magnesium carbonate, magnesium silicate, calcium silicate, mica If necessary, a diluent, a stabilizer, a colorant, a moisture absorbent, etc. are added to a filler such as calcined clay, barium sulfate, calcium sulfate and the like.

  When urethane resin is the main component, urethane resin such as blocked monodiisocyanate, blocked tolylene diisocyanate, blocked hexamethylene diisocyanate, etc., phthalates such as DINP and DOP, mineral oil, phosphorus such as alkyldiphenyl phosphate, etc. Plasticizers such as acid esters, chlorinated paraffins, low molecular weight epoxies, low molecular weight polyesters, alkyl alcohols, hydrazines such as adipic dihydrazide, amines such as dicyandiamide, calcium carbonate, magnesium carbonate, magnesium silicate, silicic acid If necessary, a diluent, a stabilizer, a colorant, a moisture absorbent, etc. are added to fillers such as calcium, mica, calcined clay, barium sulfate, and calcium sulfate.

  When rubber is the main component, diene rubbers such as butadiene rubber and isoprene rubber, rubbers such as modified rubber obtained by modifying them with maleic acid, epoxy, etc., crosslinking agents such as sulfur, peroxide, calcium carbonate, magnesium carbonate, If necessary, a diluent, a stabilizer, a colorant, a moisture absorbent, etc. are added to fillers such as magnesium silicate, calcium silicate, mica, calcined clay, barium sulfate, and calcium sulfate.

  When the main component is a cross-linked polyether, an alkoxyl functional polyether, a cross-linked polyether such as an acrylic modified type thereof, a catalyst such as a tin-based catalyst, calcium carbonate, magnesium carbonate, magnesium silicate, calcium silicate, mica, calcined clay, Diluents, stabilizers, colorants, moisture absorbers, and the like are added to adhesives such as barium sulfate and calcium sulfate, and adhesives such as epoxy resins, urethane resins, and silane coupling agents, as necessary.

  When epoxy resin is the main component, glycidyl ether type epoxy resin such as bisphenol A type epoxy resin and bisphenol F type epoxy resin, aliphatic epoxy resin, alicyclic epoxy resin, and modified epoxy resins such as NBR, CTBN, ATBN, etc. Epoxy resins such as adipic acid dihydrazide and other hydrazine-based, dicyandiamide and other amine-based curing agents, calcium carbonate, magnesium carbonate, magnesium silicate, calcium silicate, mica, calcined clay, barium sulfate, calcium sulfate and other fillers If necessary, a diluent, a stabilizer, a colorant, a moisture absorbent and the like are added.

Examples of the diluent include hydrocarbons such as solvent naphtha, esters such as ethyl acetate, and ketones such as methyl ethyl ketone.
Examples of the stabilizer include bis-2,2,6,6-tetramethyl-4-piperidyl sebacate and phenols such as 2,6-di-t-butyl-4-methylphenol.
Examples of the colorant include organic pigments such as azo pigments, carbon, and metal salts.
Examples of the moisture absorbent include calcium oxide, molecular sieve, and silica.

  As the conductive metal oxide, at least one of zinc, zirconium, titanium, nickel, platinum, magnesium, molybdenum, tin, antimony, indium, aluminum, and gallium oxide can be used. In consideration of environmental load, zinc oxide as the main component is desirable.

  It is preferable to add 3 to 20 parts by weight, preferably 10 to 16 parts by weight of the conductive metal oxide with respect to 100 parts by weight of the sealing material composition. This is because when the amount of the conductive metal oxide is less than 3 parts by weight, the chemical conversion film is not sufficiently formed, and when it exceeds 20 parts by weight, it is not easy to discharge from the gun.

Next, although an Example and a comparative example are shown and the assembly method of the vehicle body of this invention is demonstrated concretely, the range of this invention is not restrict | limited to the following Example.
<Adjustment of composition>
Each component shown in the section of A liquid and B liquid in Table 1 is blended in the number of parts shown in Table 1, stirred and mixed with a mixer for 30 minutes, and then degassed and stirred under reduced pressure for 30 minutes. Get each. The obtained liquid A and liquid B are filled in a two-liquid cartridge (CD200-01-PP, manufactured by MIXPAC), respectively, and the sealing material compositions of Examples 1 to 3 and Comparative Examples 1 and 2 are obtained.

<Performance test>
Next, the sealing material compositions of Examples 1 to 3 and Comparative Examples 1 and 2 were tested for coating properties and chemical film forming properties as performance tests.

1) Applicability: As for applicability, the two-component cartridge filled with solution A and solution B was discharged with a static mixer in a 23 ° C atmosphere using a two-component hand gun (DMPAC DM200), and the state Was observed.
The results are indicated by ○ in the table when it can be easily applied with a hand gun, and × when it is difficult to apply with a hand gun.

2) Chemical conversion film formability: For chemical conversion film formation, a two-component cartridge (CD200-01-PP manufactured by MIXPAC) in which A solution and B solution are filled on a SPCC steel plate having a thickness of 25 mm × 30 mm × 0.8 mm is used. Using a two-component hand gun (DMPAC, DM200) and applying with a static mixer, and using a spatula to a thickness of 15 mm x 20 mm x 50 μm, the test piece is 1) degreasing liquid (strong alkaline liquid), 2) water, 3) Surface conditioning solution (solution in which titanium hydroxide is dispersed in sodium phosphate), 4) Chemical conversion solution (zinc phosphate system), 5) After dipping in order of water, drying at 120 ° C. for 10 minutes, The presence / absence of formation of a chemical conversion film was observed.
The result is indicated by ○ when the chemical film is formed and by × when the chemical film is not formed.

As is clear from Table 1, in the case of Examples 1 to 3, it is clear that both the coating property and the chemical film forming property are excellent, and in the case of Comparative Example 1 where the amount of conductive metal oxide is small. In the case of Comparative Example 2, which has excellent coating properties but is inferior in chemical film formation and contains too many conductive metal oxides, the chemical film formation is excellent, but the coating properties are inferior.
As is clear from this example, by using the plastisol sealing material composition, a sealing material is applied at the stage of sub-assembly before body assembly, and then chemical conversion treatment and electrodeposition coating are performed to perform body assembly. It is clear that a vehicle body assembly method can be realized.

  The present invention realizes a method for assembling a vehicle body in a production line of an automobile or the like by applying a sealing material at a stage of sub-assembly before body assembly, and then performing chemical conversion treatment and electrodeposition coating to perform body assembly. Since it can, it has industrial applicability.

Process explanatory drawing of the assembling method of the vehicle body of the present invention Process explanatory diagram of conventional car body assembly method

Claims (4)

A method for assembling a vehicle body in which a sealing material is applied at a sub-assembly stage prior to body assembly, followed by chemical conversion treatment and electrodeposition coating, and body assembly is performed. A method for assembling a vehicle body comprising using a plastisol sealant composition containing an oxide. 2. The method of assembling a vehicle body according to claim 1, wherein the main component comprises at least one of vinyl chloride resin, acrylic resin, acrylate resin, urethane resin, epoxy resin, rubber, and cross-linked polyether resin. 3. The method for assembling a vehicle body according to claim 1, wherein the conductive metal oxide is conductive zinc oxide. The method for assembling a vehicle body according to any one of claims 1 to 3, wherein the conductive metal oxide is 3 to 20 parts by weight with respect to 100 parts by weight of the plastisol sealing material composition.

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