JP2000061385A - Base tank for preparing pipe renewal coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base tank which is equipped with means for proper temperature control and uniform agitation to respond to a problem that epoxy resin coating is deteriorated unless thixotropic properties are given, prepared, and maintained properly and houses the coating and sends it to an agitation/ mixing mechanism while the previous regulation and maintenance of the coating materials being performed. SOLUTION: A driving shaft 15 which is fitted freely attachably/detachably to a blade shaft 14 which rotates by being supported by a horizontal beam 12 stretched in a base tank main body 1 and a bearing 13 on the bottom surface is installed on the back side of a lid body 11 which is constituted to be openable/closable with the main body 1, an agitation blade 2 having a slide end fringe part 21 which slides over the entire width of a smoothing-processed main body inner wall surface is fitted to the bade shaft, a temperature control mechanism 3 is installed on a main body wall surface, a material circulating port 16 is formed on the upper side of the main body 1, a material delivery opening 17 is formed in the bottom part, and as required, a gas sealing port 18 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a state suitable for mixing when a solventless pipe rehabilitating paint is prepared by separately accommodating a base of an epoxy resin paint before mixing and a paint base such as a curing agent. The present invention relates to a base tank for preparing a pipe rehabilitation paint for preserving materials while preliminarily adjusting.

[0002]

The epoxy resin paint is
Curing is started by mixing the two liquids of the base and the curing agent, and the predetermined work must be performed within the working time from the crosslinking reaction due to the mixing to the gelation.

When the pot life is too short, the pipe rehabilitation paint will be cured before the paint film is formed, and the pipe rehabilitation work will be impossible, and the viscosity difference within the pot life will be 20000 cps or more. , A uniform coating film cannot be formed. On the other hand, if the pot life is too long, the paint blown into the rehabilitating pipe will hang down from the inner wall of the rehabilitating pipe once adhered, making it difficult to form a uniform paint film. It can't be maintained.

Conventionally, in the preparation of pipe rehabilitation paint, both liquid agents have been put in one container and stirred by hand to mix them by the intuition of a working engineer. However, since the base material and the curing agent have completely different specific gravities and viscosities, If the amount of paint is large, it cannot be done manually, and there is no guarantee that a homogeneous mixture can be obtained.

Therefore, mechanical mixing of the base material and the curing agent has come to be performed, but only quantitative mixing becomes a problem, and attention has not been paid to the thixotropic property of the coating material at the time of mixing.

Epoxy resin paints have thixotropic properties that reduce the apparent viscosity of the paints by frictional heat and shearing force acting on the paints when agitated, and these properties are adjusted by the shearing force and temperature applied to the paints. In Although,
In particular, a problem remains in stirring the coating material in the base tank.

That is, if the preparation and maintenance of the thixotropic property imparting by stirring in the base tank are not properly carried out, not only the thixotropic property imparting at the mixing stage will be excessive and deficient, but also the material of the paint will deteriorate. have.

The compounding characteristics of the epoxy resin coating are extremely delicate. Especially when the curing agent for the solventless two-component epoxy resin used for water pipe rehabilitation is an aliphatically modified amine, the coating material in the base tank, Especially on the curing agent side, the liquid agent reacts with water in the air and carbon dioxide to carbonize (whiten) the liquid surface, and at the same time, the aliphatic modified amine that binds to the paint base and exerts curing characteristics decreases. As a result, the intended curing characteristics cannot be obtained.

[0009]

[Means for Solving the Problems] In order to solve the above-mentioned problems and to solve them, while adjusting the material and maintaining the material in advance for each of the base and the curing agent of the pipe rehabilitation paint, For the purpose of providing a base tank that stores this and sends it to the stirring and mixing mechanism, in particular, it is systematic to impart thixotropic properties to the retreading paint when stirring and mixing the base that is the paint base of the epoxy resin paint and the curing agent. It is something that can be done.

That is, on the back side of the base tank body and the lid body which is constructed so as to be openable and closable, there is provided a drive shaft which is detachably fitted to a transverse beam spanned in the body and a wing shaft which is supported and rotated by a bearing on the bottom surface. Along with the blade shaft, a stirring blade having a sliding edge portion that slides over the inner wall surface of the main body that has been subjected to a smooth surface treatment over substantially the entire width is attached to the main body wall surface, a temperature adjusting mechanism, and a material circulation port on the upper side of the main body A material delivery port was provided at the bottom, and a gas inlet port was provided if necessary.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a base tank according to the present invention will be described below with reference to the drawings together with a flow of an apparatus for preparing a pipe retreading paint using the base and a curing agent of an epoxy resin paint. 1a and 1b are a pair of base tanks serving as base stations for the two liquids before mixing, and serve as bases for filling one of them with a base and the other with a curing agent and carrying the mixture to a mixing mechanism.

Each of the base tanks 1a and 1b is, on the back side of the tank body and a lid 11 which can be opened and closed, a wing shaft 14 which is supported and supported by a cross beam 12 and a bearing 13 on the bottom. The stirring shaft 2 is provided with a drive shaft 15 that is detachably attached to the stirring blade 2 having a sliding edge portion 21 that slides on the inner wall surface of the tank main body that has been subjected to a smooth surface treatment over substantially the entire width.
The temperature adjusting mechanism 3 is provided on the wall surface of the tank body, the material circulation port 16 and the gas charging port 18 are provided on the upper side of the tank body, and the material delivery port 17 is provided on the bottom.

The stirring blade 2 has a sliding edge 21 at both ends as an outer frame, and is a stirring blade 22 which is slanted in the direction of rotation and is planted in a cauldron shape.
And a screw-shaped spiral blade 23, each driven by a drive motor 24, a sliding edge 21 is attached to the inner wall of the base tank so that the sliding edge 21 slides on the inner wall over substantially the entire width. Along with scraping off, the paint is uniformly stirred and shearing force is applied to impart thixotropic properties, and temperature unevenness is eliminated to prepare a uniform crosslinking reaction.

The temperature adjusting mechanism 3 is provided with a heating / cooling mechanism for applying heat to or removing heat from the coating material filled in the tank, and a temperature sensor 31 for adjusting the temperature, and the inside of the base tanks 1a, 1b. The temperature of the coating material is kept at a predetermined temperature by applying heat or removing heat according to a predetermined calculation for each of the base material and the curing agent filled in.

The coating material to be filled in the tank is a base material and a curing agent, which prevents the reaction of a liquid material such as an aliphatic modified amine with water in the air and carbon dioxide and carbonization (whitening) of the liquid surface. In order to maintain the equivalence balance of
An inert gas such as nitrogen gas is added and sealed, and the inside of the base tank is pressurized by the inert gas.

From the bottom of each of the base tanks 1a and 1b, a circulation flow path is provided by a circulation line a and b provided with a paint temperature holding means that circulates to the upper portion of the base tank via the respective metering pumps 4a and 4b, and by switching the The paint mixing mechanism 6 from the metering pump 4 through the discharge / cleaning switching valve 5
The routes of the transfer lines A and B leading to are set to be switchable by operating the circulation valve 51.

Regarding the discharge of the prepared paint from the mixing mechanism 6, the paint discharge drive is automatically started at every predetermined time interval set by the auto cycle start switch and the cycle timer set on the setting operation panel, and automatically. An auto cycle mechanism that repeats the operation to stop is provided,
It corresponds to prevention of paint curing in the mixing mechanism when it is expected that curing of the mixing part will occur between each operation of intermittent discharge of the paint.

In the mixing and preparing apparatus configured as described above, when the base tanks 1a and 1b are respectively filled with the base material and the curing agent, the nitrogen pressurizing valve first operates to pass through the regulator to the base tanks 1a and 1b. Nitrogen gas is sent to pressurize the inside of the tank to add an inert gas, and the base material and the hardening agent filled in the base tanks 1a and 1b are heated in the base tanks 1a and 1b, respectively. The temperature is adjusted to each predetermined temperature by the stirring operation by the stirring blade 2.

Further, when pressurized, the nitrogen gas is dissolved in each of the base material and the curing agent to impart the characteristic of preventing carbonization, and the back pressure and the driving of the metering pumps 4a, 4b cause the respective base tanks 1a, 1b to be removed. A stable conveying force from the to the circulation lines a and b is added.

The first temperature adjustment is to impart fluidity to each coating material so that an appropriate stirring operation can be added, and in the winter, it is heated to a predetermined temperature by preheating,
When the paint temperature exceeds a predetermined temperature in the summer, the heat is removed to a predetermined temperature by cooling.

Each stirring blade 2 is rotated at a speed of about 10 to 20 rpm, and a sliding edge portion 21 at the tip of the stirring blade 2 slides on the inner walls of the base tanks 1a and 1b and is attached to the inner walls. Rotate so as to scrape off the etc. and uniformly stir the filled paint to give a thixotropic property by applying a shearing force, and at the same time, eliminate the temperature unevenness and create a preliminary structure with uniform physical properties.

Furthermore, since the respective coating raw materials have different degrees of coating dispersion, after the temperature adjustment in the base tanks 1a and 1b, further stirring by the stirring blades 2 is added to the coating raw materials at the bottom of the base tank. Are circulated to the upper part of the base tank through the circulation lines a and b, and the paint is dispersed uniformly by a circulation to bring them into a suitable mixing state.

The transport lines A and B and the circulation lines a and b are provided with line temperature adjusting mechanisms and temperature sensors for adjusting the temperatures on the peripheral surfaces, and the temperature in each line is used as a base and a curing agent, respectively. Is adjusted or kept constant according to a predetermined calculated value of.

When the predetermined temperature and apparent viscosity are reached, the conveying path is switched from the circulating lines a and b to the conveying lines A and B by the operation of the circulation valve 51, and the merging portions of the paint mixing mechanism 6 are respectively connected by the routes. Be transported to. The base material and the curing agent are first combined in the paint mixing mechanism 6, and are mixed and agitated in an equivalent amount corresponding to the paint balance.

When a series of adjustment operations are completed, the discharge /
By operating the cleaning switching valve 5, the cleaning agent supply path is opened and the cleaning agent supply mechanism 8 is operated to supply the cleaning agent into the mixing mechanism 6 to clean the mixing mechanism.

In the cleaning of the mixing mechanism 6 by the cleaning agent supply mechanism 8, when the discharge / cleaning switching valve 5 is switched, the air blow valve electromagnetic valve is activated and the dry air is pressure-fed through the filter by opening the air blow valve. On the other hand, the solvent blow valve solenoid valve also operates to open the solvent blow valve, the solvent pressure feed valve also operates, and the solvent is also pressure fed from the solvent tank to flow into the mixing mechanism 6 as an agitated flow in a mixed state for cleaning. Done.

Next, the solvent is filled in the mixing portion with the discharge valve closed, and the rotary drive body is rotated by the drive motor 7 of the rotary drive body in the immersed state for cleaning, and then the cleaning agent is discharged.

The coating material prepared as described above has a base viscosity of 30,000 to 40,000 cps and a curing agent viscosity of 3500 at a coating temperature of 30 ° C. without imparting thixotropic properties.
When the actual viscosity of 0 to 45000 cps is given the primary thixotropic property by stirring in the base tank and temperature adjustment, the apparent viscosity of the base is about 60 to 70% of the actual viscosity, and the curing agent is almost The apparent viscosity is about 70-80%.

Further, the stirring and mixing viscosity imparted with the secondary thixotropic characteristic by the stirring and kneading of the rotary driving member in the mixing mechanism 6 becomes an apparent viscosity of about 40 to 50% of the actual mixing viscosity.

When a paint prepared by imparting thixotropic properties is used to blow into a rehabilitating pipe, the apparent viscosity at the time the paint is blown is greatly reduced from the actual viscosity, and Shearing force is easily applied by the air flow passing through the paint, the paint progresses while maintaining extremely stable stretchability, and the viscosity changes within the pot life.
Stable within 1000 to 3000 cps.

Next, the coating material adheres to the inner wall of the rehabilitating pipe to stop the flow, and the viscosity of the coating material rapidly loses its thixotropic property due to the difference in temperature environment in the rehabilitating pipe to increase the viscosity to be converted into the actual viscosity. Therefore, the stable drying of the paint film is promoted while offsetting the decrease in viscosity within the pot life.

Further, by constructing so that an equivalent amount of the coating material base material corresponding to the coating material balance is supplied to the mixing mechanism, a durable coating film can be formed with an accurate blending ratio.

Therefore, the coating material formed on the inner wall of the rehabilitation pipe by the mixed coating material has a high viscosity by containing the coating material in the base tank according to the present invention and adjusting the material and maintaining the material in advance. Even if it is a solvent-free two-component epoxy resin that has a short pot life and a large viscosity change, it can maintain a high stretchability during the blowing operation, and a thick, uniform coating that does not sag It can be formed.

[0034]

[Brief description of drawings]

FIG. 1 is a cutaway side view of a base tank showing a structure of a stirring blade and a main part of the tank, with an outer shell of the base tank according to an embodiment of the present invention as a cross section.

FIG. 2 is a schematic system diagram of the entire paint mixing and preparing apparatus showing the position of the base tank as seen from the entire paint mixing and preparing apparatus.

[Explanation of symbols]

1 Base tank body 1a, 1b Base tank 11 Base tank lid 12 Horizontal beams 13 Bearings on the bottom of the tank 14 wing axis 15 Drive shaft mating with blade axis 16 Material outlet at the top of the tank body 17 Material outlet at the bottom of the tank 18 Inert gas inlet 2 stirring blades 21 Stirring blade sliding edge 22 Stirrer blades that are planted in a staggered pattern on the stirring blades 23 screw-shaped spiral wing 24 Stirrer blade drive motor 3 Temperature control mechanism on the wall of the tank body 31 Temperature sensor 4a, 4b metering pump 5 Discharge / cleaning switching valve 5 51 Circulation valve 6 Paint mixing mechanism 61 Preparation paint outlet 7 Drive motor for rotary drive 8 Cleaning agent supply mechanism Conveyor line to A / B paint mixing mechanism a ・ b paint circulation line

Claims (2)

[Claims] 1. A drive shaft is provided on the back side of a lid body configured to be openable and closable with the main body, the drive shaft being detachably attached to a transverse beam spanned in the main body and a wing shaft supported by a bearing on the bottom surface to rotate. A stirring blade having a sliding edge portion that slides over the inner wall surface of the main body that has been subjected to a smooth surface treatment is attached to the blade shaft,
Base tank for pipe renovation paint preparation with temperature control mechanism on the main body wall, material circulation port on the top of the main body, and material delivery port on the bottom 2. A gas charging port is provided on the upper side of the main body to pressurize the contained coating raw material to prevent air from entering, or to prevent deterioration of the coating raw material due to the characteristics of the filled gas. Base tank for pipe refurbishment paint preparation according to 1.