JP3180076B2 - Accelerator for curing reaction of coating film lined on pipe inner surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a non-solvent type pipe after removing dirt such as rust and scale from existing pipes such as existing water supply pipes disposed in a building. The present invention relates to an apparatus used for forming a coating film by lining with a liquid epoxy resin paint and heating the coating film to accelerate curing, that is, to dry the coating film.

[0002]

2. Description of the Related Art As means for drying a coating film of this kind, after lining is performed using a solventless two-component epoxy resin, for example, in addition to heat energy generated when air is compressed by a compressor, A heating source is provided in the air supply path, and air heated to about 10 to 30 ° C. is supplied with a rubber hose,
Japanese Patent Application Laid-Open No. 4-358 describes a method of breeze drying in which the air is continuously blown into the pipe at a slight pressure with a slight pressure through a stainless steel flexible hose or the like to accelerate the curing of the coating film.
The method disclosed in Japanese Patent No. 568, that is, after the coating film has been cured and dried by supplying heated air, hot water of a required temperature is flowed into the tube to heat the coating film and accelerate the curing reaction. A method of reducing the time required for practical curing and drying, and the like, are known as conventional examples.

[0003]

In the above-mentioned conventional example, heat is generated when heated air passes through a rubber hose, a stainless steel flexible hose, or the like, and the temperature decreases before reaching the inside of the pipe to form on the inner surface of the pipe. Not only can the heated coating not be heated effectively, but also the air that has been heated must be continuously fed over several hours,
In the case of performing a multi-layer lining of two or more coatings, the waiting time for performing the next lining work becomes long, and the efficiency of the construction work becomes extremely poor. In particular, when the secondary coating is performed after semi-curing and drying, there is a problem that the lining process is a two-day process, which significantly increases the work schedule and the construction cost.

Further, in the above-mentioned conventional example, specifically, epichlorohydrin and bisphenol A, which are generally known as a lining paint for rehabilitation of an existing water supply pipe, are used.
A mixed curing agent resin of an epoxy resin and a modified aliphatic polyamine is used, and the curing reaction between the epoxy resin and the curing agent progresses by about 70 to 80%. The curing reaction is promoted by using warm water as the upper limit.

However, about 20 to 30% of functional groups containing soluble molecules remain even in the case of curing and drying, and when heated with warm water in this state, the functional groups and water rapidly react with each other, particularly with water. The highly reactive resin group polyamines are combined by reaction with warm water to form a carbonized film, which causes the balance between the main agent and the curing agent to be lost during the practical curing and drying stage, and the quality of the film to be completely cured. Is reduced.

In any case, in the above-mentioned conventional example, the temperature and the amount of air to be blown are controlled mechanically to promote the curing reaction and to improve the working efficiency, and the practical curing without lowering the coating film quality. There is a problem to be solved to obtain a means for accelerating the curing reaction that can shorten the time until drying.

[0007]

Means for Solving the Problems As a specific means for solving the problems of the prior art, the present invention provides a method of cleaning the inner surface of an existing water supply pipe and then lining it with a solventless two-component epoxy resin paint to form a coating film. A device for forming and drying by controlling the promotion of a curing reaction in the coating film, and having a lateral side on one end side.
A main body comprising a cylindrical tube provided with an air intake from the other direction and an air outlet provided at the other end, and is detachably inserted and disposed inside the main body from one end side. A heating means, and a control unit capable of controlling at least the temperature of the heating means to accelerate the curing reaction of the coating film. is there.

[0008] In the present invention, the air delivery port side, providing the connection part can be connected by one touch branch pipe end of the existing water supply pipe through the working tube or insulated pipe, heated hand
The steps are formed as a unit and a nut is attached to the end of the unit.
A mounting part with a handle is provided.
It has additional requirements that it can be attached to and detached from the main body, and that a temperature detection sensor is provided on the air outlet side of the main body, and that the control unit can control the amount and time of air supply in addition to temperature control. Including.

According to the present invention, there is provided a curing reaction accelerating device which is used after lining the inner surface of an existing water supply pipe with a solvent-free two-component epoxy resin paint, and having a control unit capable of controlling at least the temperature of the heating means. The lined coating can be heated at an appropriate temperature before the paint reaches the gel point, and the heating accelerates the curing reaction of the resin, and the curing reaction is the initial reaction of polymerization. Yes, by forming a chain polymer with a large molecular weight at the initial reaction stage, the three-dimensional molecules formed by the crosslinking reaction after the gel point become insoluble molecules with a large molecular weight, shortening the curing time until practical curing Thus, a coating film of good quality can be obtained, and the workability is remarkably improved by using a dedicated curing reaction accelerating device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in more detail with reference to the illustrated embodiment. The curing reaction accelerating apparatus according to the present invention has a main body 1 formed of a cylindrical tube having a predetermined length as a whole. An air inlet 2 is provided at one end of the main body 1.
And an air outlet 3 is provided at the other end. When the diameter of the pipe to be treated is, for example, 20A to 25A, the main body 1 has a length of about 35A.
It is about 0 mm. When the diameter of the pipe to be treated is large, it goes without saying that the diameter of the main body 1 is large and the length is long.

The air intake 2 is formed so as to protrude in a direction (preferably upward) orthogonal to the main body 1 at one end side, and has a structure to which an appropriate air supply means such as a compressor can be connected. . A rod-shaped or rod-shaped heating means 4 is provided so as to be freely inserted into and removed from the main body 1 from one end side.

A socket 6 to which the temperature detecting sensor 5 is removably attached is provided at the other end of the main body 1, and the socket 6 also extends in a direction perpendicular to the main body 1 (preferably upward). The projection is formed. Further, a gantry 7 is formed substantially at the center of the main body 1, and a control unit 8 is attached to the gantry 7.

The gantry 7 has a pair of legs 7a and 7b attached to the main body 1 at a predetermined interval, and a base plate 7c is attached to the legs in a bridging manner. The controller 8 is mounted on the base plate 7c. Then, the gantry unit 7 and the control unit 8
2 are located in the same direction (upward) as the air intake port 2 and the socket 6 as shown in FIG.

As shown in FIG. 3, the rod-shaped or rod-shaped heating means 4 disposed inside the main body 1
Is supported by the support member 9 at the tip end side. The support member 9 is a plurality of projections radially provided inside the main body 1, and the outer surfaces of the heating means 4 are supported at the tips of the projections. Is located inside the main body 1 and the heating means 4
The space formed between the outside and the outside becomes the air supply passage 10 for air.

The control unit 8 controls the temperature by controlling the amount of electricity supplied to the heating means 4 based on the temperature detected by the temperature detection sensor 5 and also controls the amount of supplied air. The control is performed so that the temperature of the air sent from 3 becomes a set temperature or the air flow rate becomes a set value. In this case, the air supply temperature and the air supply air volume are set in advance, for example,
The temperature and the amount of supplied air can be selectively set by a knob or the like provided in the control unit. In addition, in the control unit 8, the air supply time can be arbitrarily set.

For controlling the air flow, for example, an air flow meter and an air flow adjustment valve are used. The air flow meter is provided on the air outlet 3 side, and the air flow adjustment valve is provided on the air intake 2 side. The air flow meter can be provided via the socket 6.

The heating means 4 is electrically heated, and is formed as one unit as shown in FIG. That is, a heating element 12 is provided inside a sheath 11 having a predetermined length, and a lead wire 13 is connected to the heating element 12. Power can be supplied.

At the end of the sheath 11 where the lead wire 13 is attached, an attachment member 14 with a nut is attached.
Are provided integrally, and the mounting member 14 is attached to the main body 1.
The heating means 4 can be attached to one end of the heating means 4 in a stable state, for example, by being screwed, and can be easily replaced when the function of the heating means 4 is deteriorated. Note that the sheath 11 may be provided with a corrugated portion or the like at least on the surface side in order to improve heat exchange.

Further, as shown in FIG. 5, a connecting portion (cam lock) for connecting to an end of an existing pipe or the like to be constructed is provided on the other end side of the main body 1, that is, on the air outlet 3 side. )
15 are provided. Actually, there are few cases in which the main body 1 is directly connected to the end of an existing pipe or the like. For example, the main body 1 is connected via a heat-radiation-preventive working pipe or a heat insulating pipe 16. Connection 15 to tube
Can be connected with one touch. The working tube or the heat retaining tube 16 is flexible or non-flexible, the outside of which is entirely heat-insulated, and is prevented from radiating heat so that the internal temperature does not easily radiate heat to the outside. And each branch pipe of the existing pipe to be constructed, for example, the branch pipe 2
1a.

The state of use of the curing reaction accelerating device thus configured will be described with reference to FIG. 6. The existing piping 21 such as a water supply pipe to be constructed is connected to a plurality of branch pipes 21a via appropriate joint members. , 21b, 21c,... Are branched and connected, and a discharge member such as a faucet is generally attached to an end of each branch pipe.

When lining is performed in such an existing pipe 21 for regeneration, as shown in the figure, after removing a discharge member such as a faucet, a coupling member and branch pipes 21a, 21b, 21c,. The inside of the existing pipe 21 including,... Is cleaned in advance by a suitable cleaning means to remove rust, scale, and other stains, and the inside is dried and cleaned before lining.

In this case, the working pipe or the heat retaining pipe 16 is
Each of the branch pipes 21a, 21b, 21c,... Is attached in advance, and a predetermined lining device is connected through the working pipe or the heat retaining pipe 16, and an appropriate paint, for example, a solventless two-component epoxy resin paint. The lining is supplied.

As one method of lining, in the existing pipe 21 in which the inside is cleaned, a base end side (the other end) where the meter mounting end 21f is mounted from the distal end side (referred to as one end side) of the pipe. Lining from each branch pipe. In this case, the operation is performed in a state where the branch pipes are branched for each branch. For example, the section from the branch pipe 21a to the branch point of the branch pipe 21b is defined as a section A, and the section from the branch pipe 21b to the branch point of the branch pipe 21c is defined as a section B. In the following, there is a so-called relay type lining method in which the sections are sequentially divided into sections C,..., The coating is supplied collectively for each section, and the lining is successively lined by blowing means with air of a predetermined pressure.

The amount of paint to be supplied is calculated in advance for the pipe diameter and length for each section, and the amount of paint for forming a coating film of a predetermined thickness is calculated for the pipe diameter and length. ,
The amount of the paint substantially corresponding to the amount is collectively supplied, and an example of the paint used is, for example, 300c
c / Pot life is about 15 to 40 minutes at an environmental temperature of 20 ° C., viscosity during flowing is about 3,000 to 15,000 cps, and thixotropic property is a solventless two-part epoxy resin having a Ti value of 4.5 or less. Paint. In addition, as a lining means, there is a method by continuous feeding, etc. In other words, it is sufficient that the inner surface of the pipe is coated with a suitable lining means.

After the completion of the lining process, a drying process of the paint inside the existing pipe is performed by using the curing reaction accelerating device of the present invention. In this case, the working pipe or the heat insulation pipe 1 from which the lining device has been removed
6 and the connecting portion 15 at the other end of the main body 1 is connected and mounted, and a drying step is started. For example, in FIG. 6, in the case of the coating, the section A is from the branch pipe 21a to the branch point of the branch pipe 21b.
As indicated by the broken line, the section from the branch pipe 21a to the distal end of the branch pipe 21b is defined as a section A, and thereafter, similarly, from the branch pipe 21b to the branch pipe 2
The area up to the tip of 1c is dried as section B.

In this case, the curing reaction accelerating device is connected to the branch pipe 21.
a, the branch pipe 21b is released, the other branch pipes 21c,... and the meter mounting end 21f are closed, and heated air is sent from the branch pipe 21a to the branch pipe 21b.
The coating film in section A is dried so as to escape from the section. Further, the heated air may be sent not only from one side of the branch pipe 21a but also alternately from the side of the branch pipe 21b to perform reciprocating drying. Then, the same procedure is sequentially performed for the other sections.

That is, in the case of drying in the section B, a curing reaction accelerating device is attached to the branch pipe 21b, the branch pipe 21c is released, the other branch pipes 21a, 21d,... And the meter mounting end 21f are closed, and the branch pipe 21b is closed. Then, the heated air is circulated through the branch pipe 21c to dry the coating film in the section B. In addition, it is also possible to leave the meter mounting end 21f open, and to simultaneously supply heated air from a plurality of branch pipes. In this case, the operation is performed in a range where the total flow rate of the air does not exceed the set value.

The temperature of the heated air sent from the curing reaction accelerating device is in the range of 25 to 70 ° C., preferably 30 to 65 ° C.
° C. Since the curing agent of the two-part epoxy resin paint used for lining is a mixed curing agent of aliphatic polyamine, when the heating temperature exceeds 70 ° C, the amine component evaporates, and the reaction balance is lost, and the water quality is deteriorated. In addition, there is a possibility that a problem in the upper layer and the strength of the coating film may occur. On the other hand, when the air supply temperature is 25 ° C. or lower, the molecules of the initial polymer of the resin coating do not grow significantly, and do not contribute much to the promotion of the curing reaction.

The time for feeding the heated air depends on the length of the pipe to be heated, the environmental temperature, the characteristics of the paint, and the like. Generally, when the pipe length is within about 5 m, it is in the range of 2 to 15 minutes. The air may be continuously set and set appropriately. In particular, during periods of poor environmental conditions such as winter, air may be continuously supplied for more than 15 minutes and about 30 minutes.

Further, depending on the characteristics of the coating material, continuous gelling of heated air may cause a local gelling phenomenon due to continuous supply of warmed air. The reaction may return and become insufficient, or the viscosity of the formed coating film may be too low to cause sagging. In such a case,
After the heating air is supplied for about 10 minutes, for example, the power of the heating means 4 in the curing reaction accelerating device is turned off, and the non-heating air is supplied for a predetermined time (about 2 to 10 minutes), and this operation is repeated. You can do it. The repetitive operation in this case can be selectively set as appropriate by a setting unit provided in the control unit 8.

With respect to the amount of heated air, for example,
In the case of a tube diameter 20~25A, air supply air volume 0.3m ³ ~
It is set appropriately within the range of 0.7 m ³ . Inlet air volume is 0.3m
^When it is ³ or less, heat transfer to the inside of the pipe is not sufficiently performed, and when the air flow rate is 0.7 m ³ or more, the surface of the formed coating film flows and the uniformity of the coating film is impaired. In the case of performing a double coating or a double coating, warm air is supplied after the primary coating and after the secondary coating to dry the coating.

In any case, the curing reaction accelerating device of the present invention supplies heated air before the paint reaches the gel point after the existing pipe is lined with a two-part epoxy resin paint. Is used to heat and dry by heating the resin to a controlled and appropriate temperature at the stage when the initial polymer is formed before the gel point, thereby promoting the reaction and increasing the molecular weight of the chain. A polymer is formed. The chain polymer formed by heating in this way is formed larger than the polymer molecule formed without heating.

As described above, when the initial polymer becomes a large molecule, the reaction proceeds thereafter to reach a gel point, and a cross-linking reaction having a larger molecular weight is performed even at the stage when a three-dimensional molecule is formed, and the curing reaction when curing and drying is performed. The coating film has stronger mechanical strength as compared with the case without heating, and a coating film excellent in strength can be formed.

In short, in order to form a molecule having a higher molecular weight after the gel point, it is necessary to increase the size of the initial polymer by heating in the previous reaction step. Even if it is performed after the formation of the polymer molecule, the expected effect cannot be obtained.

[0035]

As described above, the apparatus for accelerating the curing reaction of the coating film lined on the inner surface of the pipe according to the present invention is characterized in that the inner surface of the existing water pipe is cleaned and then lined with a solventless two-component epoxy resin paint. An apparatus for drying a film by controlling the acceleration of the curing reaction in the film by forming a coating film by drying, wherein one end side is provided with an air intake from the lateral direction , and the other end is provided with air supply. A main body consisting of a cylindrical tube provided with an outlet, and detachable from one end side inside the main body
By adopting a configuration comprising a heating means freely inserted and disposed and a control unit capable of controlling at least the temperature of the heating means to promote the curing reaction of the coating film, it can be easily attached to the end of the branch pipe of the existing water supply pipe. In particular, by having a control unit capable of controlling the temperature of the heating means, the coated film can be heated before the paint reaches the gel point by an appropriate temperature, and the heating can be performed. Accelerates the curing reaction of the resin, and the curing reaction is an initial reaction of polymerization, and is formed by a cross-linking reaction after the gel point by forming a chain polymer having a large molecular weight at the stage of the initial reaction. Three-dimensional molecules become insoluble molecules with high molecular weight,
It reduces the curing time to reach the practical curing that good coating quality is obtained, and heating means detachable from one end side
Because it is freely inserted and arranged inside the main unit,
The heated air is directly heated to increase the heating efficiency, and
If the function of the means deteriorates, replace it easily and
It has an excellent effect that it can be operated in a state .

Further, by using the curing reaction accelerating device of the present invention, the curing and drying time can be remarkably shortened, and when the lining of the existing water supply pipe is performed by multi-layer coating, the drying according to the characteristics of each coating material is performed. The state quickly arrives, and even when the secondary lining is carried out on the same day after the touch drying, the waiting time can be shortened, and the working efficiency is improved and the productivity is remarkably improved.

Further, the control unit controls the temperature, the air volume and the air volume.
By controlling the air time and heating the coated film after lining in a state where the temperature and the air volume are adjusted intermittently,
Heat-curing and drying at the initial polymer formation stage produces a polymer with a high molecular weight, and the coating film formed on the inner surface of the tube has a short time to reach the inflection point of the viscosity and temperature of the paint and the gel addition point, so that dripping is small and uniform. And an excellent effect of forming a coating film having high orientation and high mechanical strength and good quality can be formed.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a curing reaction accelerating device according to the present invention.

FIG. 2 is a schematic sectional view taken along the line AA of FIG.

FIG. 3 is a schematic enlarged sectional view taken along the line BB of FIG. 1;

FIG. 4 is a side view schematically showing a heating means of the curing reaction accelerating device according to the present invention, with a part cut away and enlarged.

FIG. 5 is a schematic side view for explaining a connection state of the curing reaction accelerating device to an existing water supply pipe.

FIG. 6 is an explanatory diagram for explaining a lining step and a drying step of an existing water supply pipe to which the curing reaction accelerating device is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body part 2 Air intake port 3 Air outlet 4 Heating means 5 Temperature sensor 6 Socket 7 Mounting part 7a, 7b Leg part 7c Base plate 8 Control part 9 Support member 10 Air supply passage 11 Sheath 12 Heat element 13 Lead wire 14 Mounting Member 15 Connecting part 16 Working pipe or heat insulating pipe 21 Existing pipe 21a, 21b, 21c, 21d Branch pipe 21f Meter mounting end A, B, C, D, E

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Asahiro Ishizawa 2-4-1 Nishi-Shimbashi, Minato-ku, Tokyo Inside Nippon Kikai Kogyo Co., Ltd. (56) References JP-A-9-299878 (JP, A) JP-A 56-38162 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05D 7/22 B05C ⁷ /00-9/08 B05B 13/06

Claims (5)

(57) [Claims] 1. An apparatus for cleaning an inner surface of an existing water supply pipe, lining it with a solventless two-component epoxy resin paint to form a coating film, and drying the coating film by controlling the acceleration of the curing reaction in the coating film. A main body comprising a cylindrical tube provided with an air intake port from one side at one end and an air outlet at the other end; and one end side inside the main body. A heating means detachably inserted from the coating means, and a control unit capable of controlling at least the temperature of the heating means for accelerating the curing reaction of the coating film. Curing reaction accelerator. 2. The pipe inner surface according to claim 1, wherein a connection portion is provided on an air outlet side so as to be able to be connected to a branch pipe end of an existing water supply pipe with a one-touch operation via a working pipe or a heat retaining pipe. A curing reaction accelerator for lined coatings. 3. The heating means is formed as a unit , and a mounting portion with a nut is provided at an end of the unit , and is detachably mounted in the main body portion via the mounting portion.
Curing reaction promoting device of the coating film lining pipe inner surface according to claim 1, characterized in. 4. The device according to claim 1, wherein a temperature detection sensor is provided on the air outlet side of the main body. 5. The apparatus according to claim 1, wherein the control unit is capable of controlling the amount of supplied air and the time of supplied air in addition to controlling the temperature.