JPS61222581A - Removal of paint from surface - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Jin's invention provides that the paint desirably contains an organic binder that is chemically soluble by a paint solvent;
It relates to a method for removing paint from a surface, such as a layer of paint on the wall surface of a building, which can be applied to the paint layer and act for the time necessary to dissolve it.

Removal of paints, especially organic paints such as oil-based or plastic-based paints, always presents significant difficulties. Old linseed oil int was removed only when the entire paint layer was thick. The scraper and blow lamp are
Although it is an effective method, it requires tedious work and is not completely risk-free. Lye was also used in some cases to dissolve the paint layer, which was then washed with water.

The difficulties have increased significantly as plastics have become commercially available in India. Various plastics are used as binders, and plastic paints are used to paint surfaces that are not suitable for certain paints. A well-known example is "tight" plastic paint on plaster.

The most common methods to date have been spraying, high pressure cleaning of the 8is type, and the use of paint removers, which are often washed away with the paint by means of high pressure liquids. For obvious reasons, none of these methods can be used indoors without taking very extensive protective measures.

It has been established that when all the above methods are used outdoors, large scratches occur on the surface. This is especially true when plastic is applied to plaster.

The three known methods give rise to several environmentally-related demands. Extensive conservation measures are taken to prevent the spread of dust and water or chemical droplets around the item in question, both for the people working in the method and for the environment generally. is necessary.

Moreover, in most of our social environments, flexible and inexpensive methods for paint removal are particularly required.

The social environment is subjected to large-scale scribble activities, where spray paint, spirit bombs, etc. are the most common tools for scribble. There are no flexible and inexpensive paint removal methods available today.

In the patent literature, paint removal by chemical mechanical methods is described in US Pat. No. 932,738. According to this method, a paint remover is applied to the painted surface and a nozzle is then used to remove the dissolved paint.

The nozzle is connected via a hose to an ejector, a vacuum source, and a container in which the dissolved paint and paint remover are collected. However, this method has not been used in practice long after the patent was granted. This is probably due to the fact that the paint and liquid mixture to be transported and removed from the surface is very difficult to handle and will not follow the air flow without other measures.

The object of the invention is to achieve a paint removal method that does not have the disadvantages of known methods. This objective is achieved by a method in which the paint solvent is applied to the paint layer on the surface and is allowed to act for a period of time until the paint layer is dissolved.

This method is characterized in that the cleaning agent is applied once or several times to the dissolved paint and immediately after this application is suctioned off together with the paint from the surface. It has been demonstrated that it is advantageous to combine chemical treatment with mechanical treatment of the surface, which assists in breaking up and loosening the paint from the surface. Mechanical treatment can be achieved, for example, by scraping means, brushes, etc., attached to the nozzle used to suction the mixture. When removing certain paints, the application of cleaning agent should preferably be directed to the nozzle location where the paint is collected prior to suction removal. The cleaning agent is selected depending on the type of paint. Plastic paints typically require a wide variety of chemicals;
Warm air can also be used in some cases. Water can also be used for alkalinity such as oil ind against India.

The temperature of the water must be above 40"C. At the same time as the dissolved paint layer is removed by suction, a post-treatment agent can be applied to the surface. Such a post-treatment agent removes the residue of the paint solvent and removes the paint. It is used to stabilize a surface after it has been removed so that a new layer of paint can be applied to a surface without being damaged by residual paint solvent.

The wash water is generally selected with respect to the properties of the surface, i.e. so that no damage to the surface occurs and that too much water is forced into any of the openings in the surface.
The dissolved paint applied at a relatively low pressure is transported to a separation unit in which the paint solvent is separated from the water together with the paint. The paint solvent is then separated and reactivated in an activation unit) so that it can be used again to dissolve the paint layer.

This invention has the advantage that the bed or surface on which the paint is applied is saved. Also, sensitive beds, such as poor-quality plaster, can be easily cleaned without damage.Furthermore, this method is extremely quick, dries, and produces a stabilized bed that can be immediately used for repainting. give. The invention also achieves maximum cleanliness and stability. It should be pointed out that this method also effectively cleans the external porosity of the surface.

This method is extremely suitable for removing paint indoors.
When repainting hallways, stairwells, and other vacant rooms, scribbles are easily removed, and so is fireproof partition paint. (The refractory partition is considered one of the largest paint layers.) This method allows for convenient use in controlled environments. Additionally, it is possible to reactivate and reuse the paint remover, which makes the process economically competitive.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the reference numeral 10 designates a surface coated with a layer of paint, for example an Indian layer 1.1. A paint solvent is sprayed onto the paint layer 11 and is allowed to act for a period of time. A nozzle 12 with a fixed or movable brush for mechanical treatment of the surface is then moved over the surface.

The nozzle 12 is connected by a hose 13 to a container 14, which in turn is connected to a vacuum source 15. The nozzle is also connected by a hose 16 to a cleaning agent container 17 from which cleaning agent is transported through the hose 16 to the nozzle. The cleaning agent container has a means for heating the cleaning agent (
(Illustrative representation). If the cleaning agent is water, this should be above 40'C, preferably 70-90'C.
It should have a temperature of C. The cleaning agent is mixed with dissolved paint residue and paint remover and drawn through hose 13 into container 14 where it is collected. By selecting the amount of cleaning agent delivered relative to the capacity of the suction nozzle, paint and liquids can be removed with minimal spillage.

The mixture of paint solvent and cleaning agent in container 14 (D) can be transported to a purification plant 18 from where the cleaning agent is separated and
It is removed through outlet 19 and optionally returned to cleaning agent container 17 . The paint solvent and dissolved paint can also be transported to a separation unit 20, where the paint remover is separated from the residual paint. The residue of jin is exit 21
and then processed in a separation plant to destroy waste products that are hazardous to the environment. The paint remover is transported to the activation unit 22, and at ζ
Once reactivated and removed through outlet 23, this paint remover can be used again to remove paint.

The cleaning agent container 17 is connected via a hose to a container 24 for aftertreatment agent. This post-treatment agent is added to the wash water during the final treatment of the walls in order to give the surface a value of approximately 7.

[Brief explanation of drawings]

Figure 1 shows the entire plant for removing paint by suction, applying post-treatment agents, and transporting and separating the dissolved paint.
Shown diagrammatically. In the drawing, 10 is the surface, and 11 is the paint layer. 12 is a nozzle, 14 is a container, and 15 is a vacuum source. 17 is a cleaning agent container, 18 is a purification plant. 20 represents a separation unit, and 22 represents an activation unit.

Claims (1)

[Scope of Claims] 1. The surface where the paint layer especially has an organic binder and has previously been applied to the surface, and the paint solvent can be applied to the paint layer and act for a certain period of time. A method for removing paint from surfaces, characterized in that a cleaning agent is applied once or several times to the dissolved paint, and immediately after this application, the cleaning agent is removed together with the paint from the surface by suction. 2. The method according to claim 1, wherein the cleaning agent is water. 3. A method according to claim 1 or 2, in which chemical removal of the paint is combined with mechanical removal. 4. The temperature of the cleaning agent at the time of application is 40°C or higher,
A method according to any one of claims 1 to 3. 5. Applying a post-treatment agent along with a cleaning agent to provide the surface with a pH value of about 7 and/or to remove paint solvent residues. 4. The method according to any one of paragraphs 4 to 4. 6. The dissolved paint is then transported to a purification plant where the paint solvent and paint are separated from the cleaning agent.
The method described in section. 7. The method of claim 6, wherein the paint solvent is separated and reactivated in an activation unit for reuse. 8. The method of claim 3, wherein the mechanical device used for the treatment is provided with a solvent near the point where the dissolved paint is collected.