JPS6116971A - Anticorrosive coating for lining inner surfaces of pipings - Google Patents

Abstract

PURPOSE:The titled coating that is obtained by adding fine hollow balls to a liquid epoxy resin, thus being suitable for regeneration of existing pipings for water supply and drainage and for anticorrosive lining without sagging in high operation efficiency. CONSTITUTION:A liquid epoxy resin containing an inorganic powder is combined with an appropriate amount of fine hollow shperical particles of glass to give the objective coating.

Description

[Detailed Description of the Invention] [Industrial Application Field] The industrial field to which this invention is applied is the treatment of existing water pipes where the water quality has become abnormal or the flow has been obstructed due to rust or dirt. , sewer pipe.

This is an industry that rejuvenates and regenerates oil pipes and the like, and an industry that manufactures corrosion-resistant lined pipes.

[Conventional technology]

Technology to rejuvenate and regenerate existing water pipes, sewer pipes, oil pipes, etc. involves mixing liquid epoxy resin with inorganic powders such as talc, silica, and asbestos to increase the consistency of the coating. Solvent-free epoxy paints have been used to thicken the film and prevent sagging.

[Problem that the invention seeks to solve]

In conventional solvent-free epoxy paints, which are made by mixing inorganic powder with liquid epoxy resin to increase the viscosity, the inorganic powder directly impairs the fluidity of the paint. The maximum thickness of the coating film obtained with such a material is about 0.3 nm, and repeated steps were required to achieve the thickness of 1+ nm DJ, which is the standard. If you increase the amount of inorganic powder in an attempt to obtain a thickness of 0.3cm or more in multiple coats, the surface of the paint film will become rough, and the wettability of the paint will become worse, or fluidity will be impaired and it will not be blown away by air currents. There were drawbacks such as the fact that the coating became difficult to paint.

[Means for solving problems]

This invention was achieved through repeated experiments in order to give a single paint two contradictory properties: the ability to easily flow with air currents and the ability to not sag even when applied thickly. That is, liquid epoxy resin mixed with inorganic powder,
This is a paint made by adding an appropriate amount of glassy microscopic hollow spheres, which improves the flow and properties of the paint and reduces its specific gravity. Therefore, it was easily fluidized by air currents, a coating film of more than one gourd was obtained in one coat, and there was no sagging, increasing work efficiency.

[Effect]

An aggregation of spherical particles in the air is characterized by better fluidity than an aggregation of non-spherical particles. This characteristic is maintained even when mixed with resin such as epoxy resin. Therefore, a paint obtained by mixing microscopic hollow spheres into an epoxy resin or the like has good fluidity. Further, since the micro hollow spheres 2 are light, the specific gravity of the paint 9 is small, about two-thirds that of conventional paints.

Due to this change in specific gravity and the good fluidity of the paint 9, despite the rough inner wall of the pipe]-1, it moves smoothly on the airflow and forms a uniform paint film with a thickness of 1 m or more. ,
Moreover, it does not cause sag.

[Example] Abrasive particles 5 are sent into existing piping 3 that is buried in the ground or in a building using compressed air flow 4 from an air conditioner, etc. to remove rust that has adhered to the inner surface of piping 3. and filth 7,
Furthermore, air flow is introduced to completely remove coarse sand and the like remaining in the pipe 3.

Next, the paint 9 is sent into the pipe 3 by the air flow 8 and is deposited on the inner surface of the pipe 3 to form a coating film 6. Paint 9 is a mixture of liquid epoxy resin and powders such as talc, silica, and asbestos.
Furthermore, vitreous micro hollow spheres 2 were added at a ratio of 50 cc to 100 cc and stirred. Paint 9 was cured at room temperature, and good results were obtained at temperatures of 5°C to 30°C. It was confirmed that the thickness of the coating film 6 remained thick for one day after one coat, and was uniform and did not sag.

〔Effect of the invention〕

This invention has the following effects.

■ By mixing inorganic powder with liquid epoxy resin, etc., and adding an appropriate amount of micro hollow spheres, the fluidity of the paint becomes good, and the specific gravity of the paint becomes small, so it can be carried by airflow. Moves smoothly through the pipes.

■ Since the fluidity is good and the specific gravity of the paint is small, the paint forms a coating film of uniform thickness and does not sag despite the rough inner walls of the piping.

■ Being able to obtain a coating film of 1m or more with one coat eliminates the need for repeated painting processes, shortens construction time, reduces construction costs, and prevents corrosion of pipes, making them durable for long-term use. There is an effect.

[Brief explanation of the drawing]

The drawings are according to an embodiment of the present invention; Fig. 1 is a partially enlarged sectional view showing the state of coating film formation on the inner surface of the pipe, and Fig. 2 is a partially enlarged sectional view showing the state of existing pipes being cleaned and polished. figure,
FIG. 3 is a partially enlarged sectional view showing the state during lining work. In the figure: To → Shu, 2-... Microscopic hollow sphere, 3... Piping, 6... Paint film, 8... Air flow, 9... Paint.

Claims (1)

[Claims] (1) A corrosion-resistant lining paint for the inner surface of piping, which is characterized by adding microscopic hollow spheres to liquid epoxy resin or the like.