JPS6227864B2 - - Google Patents

Description

[Detailed description of the invention]

Industrial Application Fields The present invention is obtained by electrostatic flocking using a polyester synthetic resin layer containing anti-rust pigments and a highly flexible reactive acrylic adhesive on a strong and workable steel plate. This invention relates to a flocked steel plate for forming processing that has excellent corrosion resistance and workability. BACKGROUND OF THE INVENTION 2. Description of the Related Art and Problems to be Solved by the Invention It has been known to perform electrostatic flocking on the surfaces of fabrics, papers, synthetic films, and the like. It is also known to apply electrostatic flocking to the surface of plywood. However, since the former cannot be used as a structure by itself, it is necessary to use it by pasting it on the surface of the base material of the molded product. In the latter case, although it is a structure itself, it cannot be formed into shapes such as drawing or bending, and is flammable, so its uses are limited. On the other hand, electrostatic flocking is often done to add beauty to cosmetic boxes, metal molded products, etc., but in the conventional method, metal, wood, etc. are formed into the desired shape in advance, and then glued together. This method involves a very complicated work process in which the agent is applied to the area to be flocked using a spray, brush, etc., and then electrostatic flocking is performed. Moreover, if the molding is irregular, the amount of adhesive applied will be thinner in the convex areas than in the concave areas, and when electrostatic flocking is applied, the pile density in the convex areas will be much smaller than in the concave areas, resulting in an uneven flocked surface. As a result, the finished appearance deteriorated. Therefore, applying electrostatic flocking to the surface after molding as in the conventional method has many problems from both a work and cost perspective. Further, even if electrostatic flocking is performed before the molding process, there are problems such as the adhesive layer being destroyed during the molding process, resulting in cracks on the flocked surface and peeling between the steel plate and the flocked layer. Means for Solving the Problems Therefore, the present inventors have developed a
In addition, we have developed a flocked steel sheet that has good corrosion resistance, adhesion, and abrasion resistance, as well as a soft feel. 2-20μ thick
A polyester synthetic resin layer containing 2 to 30 parts of anti-rust pigment is provided to 100 parts of polyester synthetic resin, and a dry film thickness of 50 to 500 μm is applied to a part or the entire surface of the polyester synthetic resin layer. This is a flocked steel sheet for molding with good corrosion resistance and workability, which is coated with a reactive acrylic adhesive having the following properties, and electrostatically flocked with synthetic resin piles on the adhesive. That is, the flocked steel plate according to the present invention is coated with a specific adhesive using a uniform coating method such as roll coating in a flat plate state, and then subjected to electrostatic flocking, resulting in a very uniform and beautiful surface finish. Furthermore, since it has excellent workability, it can be freely and easily subjected to advanced processing such as bending and drawing after flocking. Furthermore, it goes without saying that the strength of the steel plate itself allows it to be used in various types of equipment, building materials, etc. without reinforcing materials. The present invention is a flocked steel sheet produced by electrostatic flocking, which simultaneously has workability, adhesion, and corrosion resistance that have not been previously available. The steel plate used in the present invention generally has a plate thickness of 0.2
This includes steel sheets with workability and strength such as ~2.0 mm cold-rolled steel sheets, galvanized iron sheets, and aluminized steel sheets. The surface of the steel plate is degreased and further subjected to chromic acid chemical conversion treatment in order to increase the adhesion with the polyester synthetic resin layer. By performing the chromic acid-based chemical conversion treatment, the adhesion between the steel sheet and the polyester synthetic resin layer can be improved, and the corrosion resistance can be improved without impairing the workability of the flocked steel sheet. The flexible polyester synthetic resin layer coated on the steel plate is processable and can be used as a rust-preventing primer by adding about 2 to 30 parts of a rust-preventing pigment such as synchromate or strontium chromate to 100 parts of the synthetic resin. , the dry film thickness is 2 to 20μ. The reason why the amount of anti-rust pigment added is 2 to 30 parts per 100 parts is that less than 2 parts may make the steel plate immobile,
The effect of making the synthetic resin layer impermeable to prevent water from permeating can hardly be expected, and if it exceeds 30 parts, the flexibility of the synthetic resin layer will be reduced, which will have a negative effect on the workability of flocked steel sheets. It is for this purpose. Further, even if more than 30 parts of the rust-preventing pigment is added, the rust-preventing effect will not improve much. The reason why the dry film thickness range of the synthetic resin layer was limited to 2 to 20 μm is because if it is less than 2 μm, the processability of the flocked steel sheet is reduced due to the synthetic resin layer being provided between the steel sheet and the adhesive layer.
This is because no improvement in flexibility or corrosion resistance can be expected, and if the thickness exceeds 20μ, no further improvement in corrosion resistance can be expected, while workability deteriorates. On the other hand, by providing a synthetic resin layer between the steel plate and the adhesive, chemical properties such as emulsion adhesives that cause a decrease in adhesive strength, especially PH
It also has the effect of preventing oxidation-reduction reactions with the steel plate and maintaining stable adhesive strength. The adhesive used in the present invention is required to have water resistance, detergent resistance, abrasion resistance, flexibility, and adhesion due to the use of flocked steel sheets. Excellence is required. As a result of various studies, the present invention uses a reactive acrylic adhesive. Epoxy adhesives and urethane adhesives have high adhesive strength but are not flexible, so the adhesive layer may break during drawing or bending, causing cracks on the flocked surface, or the flocking layer may come off from the steel plate. It is difficult to use in applications that require severe processing due to the risk of separation. In the present invention, the desired effect is achieved by the combination of a polyester synthetic resin layer and a reactive acrylic adhesive. The thickness of the reactive acrylic adhesive layer varies depending on the shape (denier, length) of the synthetic resin pile to be flocked, but the appropriate dry film thickness is 50 to 500μ.
It is. If the thickness of the reactive acrylic adhesive layer becomes thinner than this range, the strength of the adhesive with the synthetic resin pile will be low, and the flocking density will also be low, resulting in poor appearance of the flocked surface and reduced abrasion resistance. do.
For this reason, during deep drawing, hair loss occurs in the area where the flocked surface contacts the die. If the reactive acrylic adhesive layer is thicker than this range, the synthetic resin pile will be embedded in the adhesive layer, impairing the appearance and feel of the flocked surface and increasing the cost, making it uneconomical. The synthetic resin pile referred to in the present invention mainly has a thickness of 1
It refers to short fibers of cellulose fibers such as nylon, acrylic, and rayon with a denier of ~20 denier and a length of 0.5 to 5 mm, and is appropriately selected and used depending on the purpose and usage conditions of the flocked steel plate. Examples Examples of the present invention will be described below along with comparative examples. A cross-sectional structure of an embodiment of the present invention is shown in FIG. In the figure, 1 is a cold rolled steel plate, 2 is a polyester synthetic resin layer,
3 is an adhesive layer, and 4 is a synthetic resin pile. Example 1 A polyester resin solution (manufactured by Nippon Paint Co., Ltd., product name: Nippon Paint Co., Ltd., product name: SPDIF
p. 49) was applied to a dry film thickness of 10 μm and cured by heating to form a polyester synthetic resin layer. On top of this polyester synthetic resin layer, the dry film thickness is 100 μm.
Apply a reactive acrylic acid adhesive (manufactured by Cemedine Co., Ltd., product name: MC-3) so that the adhesive is 3 denier in thickness and 0.8 mm in length. Flocking was performed using a flocking machine, and then the adhesive was cured under drying conditions of 150° C. for 4 minutes to obtain a flocked steel plate. Its structure, manufacturing conditions, characteristics, etc. are shown in Tables 1 and 2. Example 2 After degreasing the surface of an aluminized steel plate with a thickness of 0.6 mm, a chromic acid treatment was performed, and a polyester resin solution (manufactured by Nippon Paint Co., Ltd., trade name: Nippon Paint Co., Ltd., product name : SP DIF p.185) was applied to a dry film thickness of 15 μm and cured by heating to form a polyester synthetic resin layer. Dry film thickness on this synthetic resin layer
Apply a reactive acrylic acid adhesive (manufactured by Cemedine Co., Ltd., product name: MC-3) to a thickness of 300μ, and immediately attach a nylon pile (manufactured by Toyo Rayon Co., Ltd.) with a thickness of 4 denier and a length of 2.0 mm. The fibers were flocked using an electrostatic flocking machine, and the adhesive was cured under drying conditions at 150°C for 4 minutes to obtain a flocked steel plate. Its structure, manufacturing conditions, characteristics, etc. are shown in Tables 1 and 2. Comparative Example 1 Acrylic acid resin (manufactured by Nippon Paint Co., Ltd., product name: Nippon Paint Co., Ltd., product name: SP DIF A55) was applied to a dry film thickness of 10 μm and cured by heating to form a synthetic resin layer. On top of this synthetic resin layer, dry film thickness
Apply urethane adhesive (manufactured by Konishi Co., Ltd., product name: KU662) to a thickness of 20μ and immediately
Acrylic pile (manufactured by Toyo Rayon Co., Ltd.) with a denier and length of 0.8 mm was flocked using an electrostatic flocking machine, and the adhesive was cured under drying conditions of 180°C for 2 minutes to obtain a flocked steel plate. Its structure, manufacturing conditions, characteristics, etc. are shown in Tables 1 and 2. Comparative Example 2 The surface of a cold-rolled steel plate with a thickness of 0.5 mm was degreased and then treated with phosphoric acid, and then an epoxy resin solution (manufactured by Nippon Paint Co., Ltd., product name: SP) was prepared by adding 5 parts of strontium chromate to 100 parts of resin. DIF
p. 155) was applied to a dry film thickness of 5 μm and cured by heating to form a synthetic resin layer. On top of this synthetic resin layer, apply epoxy adhesive (manufactured by Cemedine Co., Ltd., product name: U-130GL) to a dry film thickness of 100μ.
Immediately, a nylon pile (manufactured by Toyo Rayon Co., Ltd.) with a thickness of 3 denier and a length of 0.8 mm was flocked using an electrostatic flocking machine, and the adhesive was dried at 180℃ for 2 minutes to cure the flocked steel plate. Obtained. Its structure, manufacturing conditions, characteristics, etc. are shown in Tables 1 and 2. Comparative Example 3 After degreasing the surface of a galvanized iron plate with a thickness of 1.0 mm, vinyl acetate adhesive (manufactured by Konishi Co., Ltd., product name: CP516) was applied to the surface to a dry film thickness of 500 μm, and then immediately glued to a thickness of 3 denier, Acrylic piles with a length of 0.8 mm (manufactured by Toyo Rayon Co., Ltd.) were flocked using an electrostatic flocking machine, and the adhesive was cured under drying conditions at 150°C for 10 minutes to obtain flocked steel plates. Its structure, manufacturing conditions, characteristics, etc. are shown in Tables 1 and 2. Comparative Example 4 After degreasing the surface of a galvanized iron plate with a thickness of 0.8 mm, it was further treated with phosphoric acid, and an epoxy adhesive (manufactured by Cemedine Co., Ltd., product name: U-130GL) was applied so that the dry film thickness was 30μ. Immediately, a nylon pile (manufactured by Toyo Rayon Co., Ltd.) with a thickness of 5 denier and a length of 2.5 mm was flocked using an electrostatic flocking machine, and the adhesive was dried at 180℃ for 5 minutes to cure the flocked steel plate. Obtained. Its structure, manufacturing conditions, characteristics, etc. are shown in Tables 1 and 2. Comparative Example 5 After degreasing the surface of an aluminized steel plate with a thickness of 1.2 mm, epoxy adhesive (manufactured by Cemedine Co., Ltd., product name: U-) was applied so that the dry film thickness was 40μ.
130GL) and immediately reduce the thickness to 5 denier and length.
2.5mm nylon pile (manufactured by Toyo Rayon Co., Ltd.) was flocked using an electrostatic flocking machine, and adhesive was applied to
A flocked steel plate was obtained by hardening under drying conditions at ℃ for 10 minutes. Its manufacturing, structural conditions and characteristics are shown in Tables 1 and 2.
Shown in the table.

【table】

【table】

[Table] As described above, it was proved that the flocked steel sheet obtained by the present invention has excellent adhesion and workability, and is also excellent in corrosion resistance. It is clear from the results of various tests that various performances such as adhesive strength, workability, and corrosion resistance have been significantly improved by providing a polyester synthetic resin layer with adhesion and corrosion resistance between the steel plate and the adhesive. It is. The flocked steel sheet obtained by the present invention as described above is
It has performance such as deep drawing, forming processing, and bending processing that cannot be obtained with flocked products made by electrostatic flocking on plywood, etc., and can be used in a wide range of complex processing applications such as kitchen equipment, office equipment, toys, and casing materials. It is an excellent composite material that can be used, and the value of its invention is great.

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional structure of an example of the flocked steel plate of the present invention. 1...Cold rolled steel plate, 2...Polyester synthetic resin layer, 3...Adhesive layer, 4...Synthetic resin pile.

Claims (1)

[Claims] 1. A polyester synthetic resin layer containing 2 to 30 parts of a rust-preventing pigment to 100 parts of a polyester synthetic resin with a dry film thickness of 2 to 20 μm is provided on the surface of a steel plate that has been subjected to a chromic acid-based chemical conversion treatment. Dry film thickness of 50 to 500μ on part or the entire surface of the resin layer
1. A flocked steel sheet for molding with good corrosion resistance and workability, which is coated with a reactive acrylic adhesive having a flexibility of 100%, and electrostatically flocked with synthetic resin piles on the adhesive.