JPH0218903B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method for pre-painting treatment when painting the surface of a face plate of a Sandersch adhesive structure, and more specifically, to improve work efficiency by simplifying the pre-painting treatment of the painted surface of the face plate. The present invention also relates to a method for pre-painting a sanderch panel that improves the adhesion of the paint. [Prior art] Conventionally, when a face plate is bonded to the upper and lower surfaces of a honeycomb core via an adhesive and the surface of this face plate is painted,
After sanderch panels are glued to the top and bottom surfaces of the honeycomb core, pretreatment for painting is performed. By the way, in the case of the above-mentioned method of pre-treatment for painting after bonding the sanderch panel, nylon is generally used because it has a negative effect on the adhesion performance between the upper and lower surfaces of the honeycomb core and the sanderch panel. Brushes (e.g. 3M product name:
After polishing the surface with Scotch Bright) or a wire brush, a chemical film treatment is applied by brushing with alodine solution, etc., and the touch-up method is performed by washing with water and drying. However, such conventional painting pretreatment methods require a lot of effort and time, are not economical, and are inefficient. [Purpose of the Invention] This invention was devised by paying attention to the problems of the conventional art, and its purpose is to save a lot of time and effort by simplifying the pre-painting treatment of the painted surface of the face plate. To provide a method for pre-painting a sanderch panel, which enables the pre-painting treatment to be carried out inexpensively and efficiently without the need for painting, and further improves the adhesion of the paint on the sanderch panel. [Structure of the Invention] In order to achieve the above object, the present invention provides a method for pre-painting a sanderch panel, in which a face plate is adhered to the upper and lower surfaces of a honeycomb core via an adhesive, and the surface of the face plate is painted. In the pre-process of adhering the face plate to the core, the surface of the face plate is acid-etched, masking tape is pasted on the painted side of the acid-etched face plate to protect the treated surface, and then the upper and lower surfaces of the honeycomb core are bonded. The gist of this method is to attach and fix a face plate to the rear plate using an adhesive, peel off the masking tape stuck to the painted side of the rear plate, and paint the surface of the face plate. [Embodiments of the Invention] Examples of the invention will be described below with reference to the accompanying drawings. FIG. 1 shows an overall perspective view of a finished product in which the sandwich adhesive structure of the present invention is implemented, in which 1 is a honeycomb core, and 2a and 2b are adhesives 3 on the upper and lower surfaces of the honeycomb core 1, as shown in FIG. The face plate is shown adhesively fixed through the base plate. Next, the method for pre-painting the sanderch panel will be explained in accordance with the process order. First, in the pre-process of bonding the face plates 2a, 2b to the honeycomb core 1, a pre-adhesion process for the face plates 2a, 2b is performed. This pre-adhesion treatment method is carried out using a surface treatment device in which a chemical solution is placed in a tank (not shown).Generally, the surface plates 2a, 2b are immersed in the chemical solution in the tank using a dipping method.
Soak and treat the entire surface. The type of chemical solution varies depending on the material of the face plates 2a, 2b. For example, if the material of the face plates 2a, 2b is aluminum, an aqueous solution method of sodium dichromate and sulfuric acid, a phosphoric acid anodization method, a chromic acid anodization method, etc. are used. . When the material of the face plates 2a and 2b is stainless steel, the step is carried out using an aqueous solution method of sodium dichromate and sulfuric acid, an aqueous solution method of hydrogen fluoride and nitric acid, or the like. Next, after the acid etching process on the surfaces of the face plates 2a and 2b is completed, the face plates 2a and 2b are etched as shown in FIG. 3a.
Masking tape 4 is pasted on the painted surfaces X side of a and 2b to protect the treated surfaces from staining. As the masking tape 4, a commercially available product such as a wide-width vinyl chloride film with a pressure-sensitive adhesive is used. Next, the face plate 2 with masking tape 4 pasted
A liquid adhesive 3 or a film adhesive 3 is applied to the surface opposite to a and 2b, that is, the side opposite to the painted surface X, as shown in FIG. 3b. When such preliminary preparation is completed, as shown in FIG. 3c, using a jig (not shown), the face plates 2a and 2b are attached to the upper and lower surfaces of the honeycomb core 1 via the adhesive 3, respectively, and The face plates 2a and 2b are pressed onto the upper and lower surfaces of the honeycomb core 1 using a press or an autoclave, and heated and hardened. Then, peel off the masking tape 4 stuck to the painted side of the rear plates 2a and 2b, and
The work is completed by painting the painted surfaces a and 2b with a spray or brush (see Figure 3 d). In this way, in the present invention, after the acid etching treatment on the surfaces of the face plates 2a and 2b is completed, the coated surfaces are cleaned with a nylon brush (for example, Scotch Bright, manufactured by 3M) or a wire brush, as in the conventional method. After polishing, there is no need to perform a chemical film treatment by brushing with alodine solution, etc., and then perform a touch-up method, which involves drying after washing with water, which shortens the work process and improves work efficiency. Next, as a result of adhesion testing of coating films using the present invention and the conventional method, the following results were obtained. (a) Paint film adhesion test method (1) Perform an adhesion test to confirm the adhesion between the painted surface and the metal plate. (2) Test method: Federal Test Method
Standard141 Method 6301 Wet Adhesion
(Tepe Test). (b) Outline of test method (1) Adhesive tape 25.4mm wide flat tape, average 80OZ/25.4
Use adhesive tape with mm width. (3M Scotch Tape No. 250 is applicable) (2) Roller Use a roller that weighs 2.0 kg and is covered with rubber with a hardness of 70 to 80, and has an outer diameter of 89 mm and a width of 44 mm. (3) Test method 1 Soak the painted test piece in water for 24 hours. 2 Remove the test piece and wipe it with a soft cloth. 3. Within 1 minute after taking it out, make two parallel marking lines with a gap of 25.4 mm deep, reaching the metal surface. 4 Use a roller to apply the adhesive tape across the marking line. 5. Quickly peel off the adhesive tape and check whether the paint film peels off. (c) Test results

〔Effect of the invention〕

This invention provides a method for pre-painting a sanderch panel in which a face plate is adhered to the upper and lower surfaces of a honeycomb core via an adhesive and the surface of the face plate is painted, as described above. In the process, the surface of the face plate is acid-etched, masking tape is pasted on the painted side of the acid-etched face plate to protect the treated surface, and then adhesive is applied to the upper and lower surfaces of the honeycomb core, respectively. When the face plate is attached, the masking tape attached to the painted surface of the rear face plate is peeled off and the surface of the face plate is painted. This simplifies the pre-painting process for the painted surface of the face plate, saving a lot of time and effort. It is possible to carry out pre-painting treatment inexpensively and efficiently without the need for paint, and also has the effect of improving the adhesion of the paint on the sanderch panel.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view of a completed product with a sandwich adhesive structure according to the present invention, and Fig. 2 is an A of Fig. 1.
The enlarged sectional views in FIGS. 3a to 3d are explanatory diagrams showing the process sequence of a method for pre-painting a sanderch panel. 1...honeycomb core, 2a, 2b...face plate, 3
...Adhesive, 4...Masking tape.

Claims (1)

[Claims] 1. In a method for pre-painting a sanderch panel in which a face plate is adhered to the upper and lower surfaces of a honeycomb core via an adhesive and the surface of this face plate is painted, in the pre-process of adhering the face plate to the honeycomb core, the surface of the face plate is After applying an acid etching treatment to the painted surface of the acid-etched face plate to protect the treated surface, the face plates are attached and fixed to the upper and lower surfaces of the honeycomb core using an adhesive, respectively. A method for pre-painting a sanderch panel, characterized in that the surface of the face plate is painted by peeling off the masking tape attached to the painted side of the rear face plate.