JPS6247591B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of coating an object to be coated using a two-component, non-mixable, cold-setting coating agent.

Generally, in industrial painting, it is necessary to use a crosslinking reaction type paint in order to achieve a coating that exhibits excellent film performance, but in this case, energy such as heat is required to cause the reaction. It was necessary to apply it to the painted surface. Furthermore, in order to increase the efficiency of painting operations, it is necessary to use methods such as heating at high temperatures, which poses problems such as increased energy consumption and increased size of painting equipment.

This invention was made in view of the above-mentioned problems, and provides a coating method that enables energy-saving and high-productivity coating by overcoating a two-component, non-mixable room temperature curing type coating agent. be. In addition, ordinary room-temperature curing type paints have poor storage stability and gel and solidify within a short period of time, making them unusable. The purpose of the present invention is to provide a coating method that improves the storage stability of the coating material and easily obtains a constant and high-performance coating film.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a galvanized iron plate which is an object to be painted, 2 and 2 support this galvanized iron plate, and
Backup rolls 3 and 4 to be moved in the direction of arrow A in the figure are arranged above the galvanized iron plate 1,
Containers 7 and 8 each containing coating liquids 5 and 6 constituting a two-component non-mixable room temperature curing type coating agent;
9 and 10 rotate in contact with the pick-up rolls, and apply the coating liquids 5 and 6 attached to the pick-up rolls to the painted surface of the galvanized iron plate 1. The coating roll is disposed at a position opposite to the back-up rolls 2, 2 so as to sandwich the galvanized iron plate 1 therebetween.

The two-component non-mixable room temperature curing type coating agent includes a mixture of composition (a) whose main component is an unvulcanized rubber acrylate resin and an organic peroxide, and a liquid and radical-curing coating agent. It is a mixture of a composition (b) whose main component is a synthetic resin containing unsaturated double bonds that can cause a reaction, and a compound (c) that facilitates the generation of radicals when it comes into contact with an organic peroxide. The compound (c) includes any one of organometallic soaps, mercaptans, thiourea and its derivatives, amines, aniline derivatives, toluidine derivatives, organic acids, and the like. Further, as a two-component non-mixable room temperature curing type coating agent, a mixture of the above composition (a) and the compound (c), and a mixture of the above composition (b) and an organic peroxide may be used.

The above-mentioned two-component, non-mixable room-temperature curing coating agent is a basic colorless resin composition, but in order to distinguish it, it can be colored by adding pigments, dyes, etc. to at least one of the two components. is also good.

Next, in the coating device configured in this way,
To explain how to do this, first, the back up rolls 2, 2, the pick up rolls 7, 8, and the coating rolls 9, 10 are rotated in a desired direction. Then, when the galvanized iron plate 1 is carried in so as to be sandwiched between the back-up roll 2 and the coating roll 9, the coated surface of the galvanized iron plate 1 is coated with the coating roll 9, while forming a two-component non-mixable room temperature curing agent. Further, the galvanized iron plate 1 is moved in the direction A in the drawing by the back-up roll 2, and the other coating liquid 6 constituting a two-component non-mixable room temperature curing agent is applied by the coating roll 10. , the painting is completed.

In addition, in the painting according to the above embodiment, the painted object can be handled within about 5 minutes after painting, but
It takes about an hour for the curing reaction to complete and the final coating performance to appear, but if you want to obtain the final coating performance within a short time, you can heat it after applying the two components. Well, after applying the two liquids, heat at 70 to 80℃ for 4~
If kept for 5 minutes, the final coating performance can be obtained.

In addition, although a galvanized iron plate was used as the object to be painted in the above example, the material may be either metal or non-metal, and the coating agent may be applied to optimize the paintability and adhesion of the coating film depending on the material. It may be selected as desired, and may be applied to any stage of painting, such as undercoat, intermediate coat, top coat, etc. Furthermore, excellent coating is possible when the shape of the object to be coated is a flat plate or a strip, but it can also be applied to a certain degree of curved or uneven surface, and the coating film can also be applied to curved or uneven surfaces. The general properties such as strength characteristics and adhesion are the same as those of flat plates and strip-shaped surfaces.
Furthermore, in the above embodiments, a coating roll was used as the coating equipment, but a brush, spatula, roller brush, roll coater, flow coater, etc. may also be used, and a roll coater is used in the case of a flat or strip-shaped object to be coated. This method is optimal for increasing the coating speed and improving the appearance of the coating, and brush or spatula application is sufficient when performing simple coating on curved surfaces or objects with small areas.

A specific embodiment of this invention will be described below.

Hardrock C is a non-solvent type modified acrylate composition as a two-component non-mixable room temperature curing type coating agent.
-320 (manufactured by Denki Kagaku Kogyo KK), and a galvanized iron plate having a thickness of 1.2 mm and a width of 200 mm as the object 1 to be coated was coated with the coating apparatus shown in the figure. first,
Coating liquid 5 consisting of Part A of Hardrock C-320 is applied to a thickness of 0.1 mm on the painted surface of the galvanized iron plate 1, and 0.5 minutes after application of Part A with Backup Roll 2, it is coated with Part B of Hardrock C-320. Coating liquid 6 to 0.1
Coating was carried out by overlaying the coating film of agent A to a thickness of mm. As a result, when the coated surface was touched with a finger 5 minutes after application of agent B, a dense and smooth coated surface was obtained. Moreover, the shore hardness was 55, 65, 68, and 70 at 5, 10, 30, and 60 minutes after the completion of coating. Furthermore, the Shore hardness was 70 when heat treated at 80°C for 5 minutes immediately after painting was completed.

Next, when we reversed the application order of Part A and Part B of Hardlock C-320, the shore hardness was 50, 62, and 67 at 5, 10, and 60 minutes after finishing painting.
Although it was slightly lower than the above, there was no difference at all in the appearance of the coating film.

In addition, after applying Hardlock C-320 A agent, B
When we changed the roller speed of Backup Roll 2 and applied the agent after 1 minute, 2 minutes, and 5 minutes, we found that the appearance of the painted surface was different from that after 0.5 minutes. , and the shore hardness after painting were completely the same.

As described above, this invention uses a mixture of organic peroxide and a composition mainly composed of unvulcanized rubber and acrylate resin, and the other is a mixture of a composition containing unvulcanized rubber and acrylate resin as main components, and the other is a mixture of a composition that is liquid and can cause a curing reaction by radicals. A two-component, non-mixable room-temperature curing coating agent that is a mixture of a composition whose main component is a synthetic resin containing saturated double bonds and a compound that facilitates the generation of radicals when it comes into contact with an organic peroxide. After applying one of the two to the painted surface of the object to be painted, the other layer is applied, which significantly improves the storage stability of the paint and ensures that the physical properties of the coating agent in each layer are exhibited in each layer. Because of this, there is no interference between layers due to overcoating, and the expected coating effect can be obtained, making it possible to easily obtain a consistent and high-performance coating film, and there is no need to apply heat to the painted surface. , it is possible to suppress an increase in energy consumption and an increase in the size of painting equipment, and it is possible to perform painting with a simple painting operation, which has the effect of improving work efficiency and reducing costs.

[Brief explanation of the drawing]

The figure is a simplified diagram showing a coating device for explaining one embodiment of the present invention. In the figure, 1 is an object to be coated, 2 is a back-up roll, 5 and 6 are coating liquids constituting a two-component non-mixable room temperature curing type coating agent, and 9 and 10 are coating rolls.

Claims (1)

[Scope of Claims] 1. One is a mixture of a composition mainly composed of unvulcanized rubber and acrylate resin, and an organic peroxide, and the other is a mixture of an unsaturated dihydride that is liquid and capable of causing a curing reaction with radicals. Any two-component, non-mixable room-temperature curing coating agent that is a mixture of a composition whose main component is a synthetic resin containing a double bond and a compound that facilitates the generation of radicals when it comes into contact with an organic peroxide. A method of painting an object to be painted, characterized in that one of the two is applied to the painted surface of the object to be painted, and then the other is overcoated. 2. As a two-component, non-mixable, room-temperature curing coating agent, one is liquid, and one is a mixture of a composition whose main component is a synthetic resin containing an unsaturated double bond that can cause a curing reaction by radicals, and an organic peroxide. A patent claim characterized in that the other is a mixture of a composition whose main components are unvulcanized rubber and an acrylate resin, and a compound that facilitates the generation of radicals when it comes into contact with an organic peroxide. The coating method described in item 1 of the scope. 3. The coating method according to claim 1 or 2, wherein at least one of the two-component, cold-curing type coating agent is a colored composition.