KR102390333B1 - spray type high strength lining method for water supply pipe - Google Patents

Abstract

A spray-type high-strength lining method for a water supply pipe according to the present invention comprises: a high-pressure water pipe washing and surface treatment step of removing an existing a coating layer on the inner circumference surface of an existing water supply pipe and washing the same using high-pressure water; a step of forming an anticorrosive coating layer by spraying and applying an anticorrosive coating agent as a primer to the inner circumference surface of the existing water supply pipe after the high-pressure pipe washing and surface treatment step of the existing water supply pipe; and a step of forming a lining by spraying and applying polymers so that a polymeric lining inner pipe can be formed on top of the anticorrosive coating layer after the corrosive coating layer spray formation step. Accordingly, a long section of the existing water supply pipe can be constructed in a short period in a non-drilling manner using a spray method and using a pipe regeneration method, thereby strengthening corrosion resistance and reinforcing the water supply pipe structurally. A new concept in anticorrosive coating agents with excellent adhesion even on a wet surface can be sprayed and applied to form an anticorrosive coating layer independently, thereby simplifying construction and reducing construction costs. The lining formation of high-toughness polymers is performed on the site on top of the anticorrosive coating layer using a spray application method to form an independent inner pipe, thereby reinforcing the existing water supply pipe structurally. The inner pipe can be formed easily as one body without any joint at branching points, bent pipe parts, etc., thereby dispensing with the operation of reconnecting branching pipes and reducing the construction period.

Description

Spray type high strength lining method for water supply pipe}

The present invention relates to a spray-type water supply pipe high-strength lining method, and more specifically, by constructing a long section with a pipe regeneration method within a short period of time in a non-excavating type through a spray method, an existing water supply pipe with enhanced corrosion resistance can be structurally reinforced, and excellent adhesion even on wet surfaces can make construction easier and reduce construction costs. It relates to a spray-type water supply pipe high-strength lining method that can be easily formed in one piece, can make reconnection of branch pipes unnecessary, and can shorten construction period.

In general, pipes for transporting fluids, such as water supply pipes, sewage pipes, oil pipes, and gas pipes, are mainly cast iron pipes, steel pipes, synthetic resin pipes, and concrete pipes.

Among these, large-sized pipes mainly use cast iron pipes or steel pipes. When cast iron pipes or steel pipes are used for a long time, they are deteriorated due to fluids or other foreign substances passing through the inside, resulting in corrosion or damage.

In particular, in the case of a water supply pipe made of a cast iron pipe or a steel pipe, the inside is coated to prevent oxidation for safer drinking water supply, but when used for a long time, problems such as corrosion or peeling of the coating inside occur.

As a way to solve this problem, there is a method to replace the entire pipeline, but excavation work to replace the entire pipeline causes traffic congestion, takes a lot of time and money to replace, and may cause leakage of the joint of the replaced pipe again. As this causes economic loss and shortens the lifespan, non-excavation rehabilitation methods are being applied to improve the pipeline while leaving it as it is.

An example of an old pipe rehabilitation method according to the prior art is disclosed in Korean Patent Registration No. 10-1084062 (registered on November 10, 2011, hereinafter referred to as 'Patent Document 1') and the like.

However, according to the old pipe rehabilitation method according to the prior art, the coating film removal equipment is put inside the old pipe and the rolling cutter cuts and removes the coating film while rotatingly contacting the inner surface of the pipe, but it takes a long time to remove the coating film, The coating film strongly adhered to the inner surface does not fall off from the inner surface even after being cut, and a part of it does not fall off the inner surface, so the removal effect of the film is lowered. There is a risk that the coating film may be peeled off from the inner surface of the

Republic of Korea Patent Registration No. 10-1084062 (registered on November 10, 2011)

An object of the present invention is to construct a long section in a short period of time by a pipe regeneration method in a non-excavating type through a spray method to structurally reinforce an existing water supply pipe with reinforcement of corrosion resistance, and to attach it even on a wet surface Excellent performance makes construction easier and reduces construction costs It is to provide a high-strength lining method for a spray-type water supply pipe that can make reconnection unnecessary and shorten the construction period.

In order to achieve the above object, the spray-type water supply pipe high-strength lining method according to the present invention includes: a high-pressure water tube and surface treatment step of removing the existing coating layer on the inner peripheral surface of the existing water supply pipe and washing with high-pressure water; After the high-pressure water tube and the surface treatment step of the existing water supply pipe, spraying an anticorrosive coating agent as a primer on the inner peripheral surface of the existing water supply pipe to form an anticorrosive coating layer; and, after the spray-forming step of the anti-corrosive coating layer, spray-coating a polymer to form an inner tube lined with a polymer on the anti-corrosive coating layer to form the lining.

Here, the main subject of the anticorrosion coating agent used in the spray forming step of the anticorrosive coating layer is 10 to 15% by weight of bisphenol A type epoxy resin, 6 to 7% by weight of bisphenol F type epoxy resin, and 6 to alkyl glycidyl ether 7% by weight, 0.25 to 0.28% by weight of propylene glycol monomethyl ether acetic acid, 64 to 66% by weight of mica iron oxide, and 6 to 7% by weight of titanium dioxide,

The curing agent for the anticorrosion coating agent used in the spray forming step of the anticorrosive coating layer is preferably composed of benzyl alcohol, isophorone diamine, meta-xylene-alpha, alpha-diamine, and salicylic acid.

And, the main polymer used in the spray molding step of the polymer lined inner tube consists of 90 to 95% by weight of MDI-polypropylene glycol copolymer and 5 to 10% by weight of propylene carbonate,

The polymer curing agent used in the spray molding step of the polymer lining inner pipe is 50 to 60 wt% of polydiamine, 5 to 15 wt% of glycerol tris ether, 20 to 30 wt% of diethyltoluenediamine, and 1 to titanium dioxide It is preferable that it consists of 5 weight%.

According to the present invention, the existing water supply pipe can be structurally reinforced with corrosion resistance by constructing a long section with a pipe regeneration method within a short period of time in a non-excavating type through a spray method, and adhesion is also achieved on a wet surface. By spray-applying this excellent new concept anti-corrosion coating agent, the anticorrosive film layer can be formed independently, making construction easier and reducing construction costs. It can be molded to form an independent inner pipe, structurally reinforcing the existing water supply pipe, and it is possible to easily form the inner pipe in one piece without any seams even at branch points and curved pipe parts, and reconnection of branch pipes is unnecessary. It is possible to provide a spray-type water supply pipe high-strength lining method that can reduce the cost and shorten the construction period.

1 is a process flow diagram of a spray-type water supply pipe high-strength lining method according to the present invention;
Figure 2 is a cross-sectional view of the water supply pipe construction is completed by the high-strength lining method of the spray-type water supply pipe according to the present invention;
3 is a perspective view of a partial area of the water supply pipe of FIG. 2;
4 is a photograph of an existing water supply pipe before the spray-type water supply pipe high-strength lining method according to the present invention is performed;
5 is a photograph showing a state in which the welding line short-circuited part of the existing water supply pipe in the conventional water supply pipe high-pressure water tube and surface treatment step of FIG. 1 has been grown with a resin for putty;
6 is a photograph showing an example in which the high-pressure water washing operation is performed in the conventional water supply pipe high-pressure water tubing and surface treatment step of FIG. 1;
7 is a photograph showing a state in which the anticorrosive coating layer spray forming step of FIG. 1 is completed;
Figure 8 is a photo showing an example of the operation in which the polymer lining inner tube spray molding step of Figure 1 is made,
9 is a coating film performance evaluation sheet of the anticorrosive coating layer by the anticorrosion coating agent according to the present invention;
10 is an official test report regarding the mutual adhesion performance between the inner tube of the polymer lined with the high toughness polymer and the anticorrosive film layer according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The spray-type water supply pipe high-strength lining method according to the present invention, as shown in FIG. 1, removes the existing coating layer on the inner circumferential surface of the existing water supply pipe 10 and washes it with high-pressure water, a high-pressure water tube and surface treatment step (S10) ) and spraying an anticorrosive coating agent as a primer on the inner peripheral surface of the existing water supply pipe 10 after the high-pressure water tube and surface treatment step (S10) of the existing water supply pipe to form an anticorrosive coating layer 100 (S20) ) and, after the anticorrosive coating layer spray forming step (S20), spray coating a high toughness polymer so that the polymer lining inner tube 200 is molded over the anticorrosive coating layer 100 to form the lining (S30). .

Accordingly, the existing water supply pipe 10 can be structurally reinforced with corrosion resistance by constructing a long section with a pipe regeneration method in a short period of time in a non-excavating type through a spray method, and the wet water supply pipe 10 can be structurally reinforced The anticorrosive coating layer 100 can be formed independently by spraying a new concept anti-corrosion coating agent with excellent adhesion in terms of surface, thereby simplifying construction and reducing construction costs. It is possible to form an independent polymer-lined inner pipe 200 by lining the tough polymer in the field by spray coating, so that the existing water supply pipe 10 is structurally reinforced, and the polymer lining is seamless even at branch points and curved pipe parts. It is possible to provide a spray-type water supply pipe high-strength lining method that can make the inner pipe 200 easy to be formed integrally, make reconnection of the branch pipe unnecessary, and shorten the construction period.

The existing water pipe high-pressure water pipe and surface treatment step (S10) is a step of first examining the pipe line of the existing water supply pipe 10, such as an intake or water purification plant, where the lining method is to be performed, and a work tool through which a worker or equipment passes It is preferable to be made after the step of building and cutting the existing water supply pipe (10).

At this time, the existing water supply pipe high-pressure water pipe and surface treatment step (S10) is to drive the hoist and other equipment by introducing electricity from the outside to the generator into the inside of the existing water supply pipe 10 when electricity is not supplied to the work site. It is preferred to include a step.

Here, the generator is preferably a 50 kW, 220 V, three-phase system.

4 is a photograph showing the state of the existing water supply pipe 10 before the spray-type water supply pipe high-strength lining method according to the present invention is performed.

The spray-type water pipe high-strength lining method according to the present invention can be applied to any existing water pipe 10 with a diameter of 700 mm or more.

On the other hand, in the conventional water pipe high-pressure water tube and surface treatment step (S10), as shown in FIG. 5, the old coating layer of the existing water supply pipe 10 is removed with a power brush, etc., After completing the growth of the welding line short circuit in (10) with a resin for putty such as epoxy, as shown in FIG. 6, a plurality of spray nozzles extending radially toward the inner peripheral surface of the existing water supply pipe 10 and washing the high-pressure water with a high-pressure water injection device having a

Accordingly, it is possible to facilitate the processing of the branch pipe.

Here, it is preferable to use a jet injector having a capacity of 250 ℓ/min and 500 bar as the high-pressure water injector.

In the anticorrosive coating layer spray forming step (S20), as shown in FIGS. 2 and 3, a solvent-free type anticorrosion coating agent is sprayed on the inner peripheral surface of the existing water supply pipe 10 to form an anticorrosive coating layer having a thickness of 150 μm ( 100) is formed.

Accordingly, as shown in FIG. 7, a new anticorrosive film layer 100 with excellent adhesion to rust and moisture is independently formed on the existing water supply pipe 10, so that conditions such as humidity and dew point are separately managed. (For example, since conventional paint is opposite to moisture, the inside of the pipe must have a humidity of 80% or less and the surface temperature must be 3°C higher than the dew point temperature.) Even if step 20 is performed immediately after the existing water pipe high-pressure water pipe and surface treatment step (S10) performed, it is performed immediately without a separate drying process or humidity management process, so that the construction can be facilitated and the construction period can be shortened. .

The subject matter of the anticorrosion coating agent used in the anticorrosive coating layer spray forming step (S20) is 10 to 15% by weight of bisphenol A type epoxy resin, 6 to 7% by weight of bisphenol F type epoxy resin, and alkyl glycidyl ether 6 ~ 7% by weight, 0.25 ~ 0.28% by weight of propylene glycol monomethyl ether acetic acid, 64 ~ 66% by weight of mica iron oxide, and 6 ~ 7% by weight of titanium dioxide, the anticorrosive coating layer spray forming step (S20) The curing agent of the anticorrosive coating agent used in the present invention is preferably composed of benzyl alcohol, isophorone diamine, meta-xylene-alpha, alpha-diamine, and salicylic acid.

Accordingly, as shown in FIG. 9 , a new concept eco-friendly anti-corrosion coating agent that goes beyond the limits of the climatic environment is prepared and sprayed on the inner peripheral surface of the existing water supply pipe 10 as a primer to prevent moisture and rust. It is possible to overcome the limitations of the existing construction by allowing the anticorrosive coating layer 100 to be independently formed even on a wet surface with excellent adhesion.

More specifically, the curing agent of the anticorrosive coating agent includes 35 to 45% by weight of benzyl alcohol, 20 to 30% by weight of isophorone diamine, 20 to 30% by weight of meta-xylene-alpha, alpha-diamine, and 5 to 15% by weight of salicylic acid It is preferably made up of % by weight.

Accordingly, when performing step 20, workability is further improved by the anti-corrosion coating agent according to the present invention, curing can be performed quickly, and chemical resistance can be excellent.

Epoxy resin (bisphenol A type epoxy resin; bisphenol F type epoxy resin)

Epoxy is defined as a cross-linked polymer having cross-links resulting from the reaction of epoxy groups. A thermosetting resin produced by polymerization of a resinous substance having two or more epoxy groups in a molecule and an epoxy group. Epoxy resin has a specific gravity of 1.230 ~ 1.189, and has excellent mechanical properties such as bending strength and hardness. There is no generation of volatile substances and no shrinkage of volume during curing, and it has great adhesion to the material surface when cured. It has great flammability and chemical resistance, but is slightly corroded by strong acids and strong bases. By adding a pigment (顔料), it can be colored freely, and the light resistance is also great. The maximum operating temperature of the product is as low as 80 degrees Celsius. It shows excellent workability such as molding, embedding, and encapsulation.

- Bisphenol A type epoxy resin

Bisphenol A type epoxy resin is used for general electrical, electrical and electronic, adhesive, civil and building paints and heavy corrosion resistant materials. Bisphenol A type epoxy resin can i) obtain various physical properties depending on the type of curing agent and modifier, ii) different heat Less curing shrinkage compared to curable resins, iii) excellent toughness and high temperature characteristics, iv) excellent chemical and water resistance, v) Ether bonding is rotatable and has plasticity, vi) rules of hydroxyl groups and hydrocarbons It has a great advantage of adhesiveness. Bisphenol A type epoxy resin can contribute to exhibit superior adhesive performance of the functional coating agent at 10 to 15 wt % of the content in the main ingredient, and if it is contained too much or too little outside this, the adhesive performance of the functional coating agent can be reduced. .

- Bisphenol F type epoxy resin

The bisphenol F-type epoxy resin exhibits low viscosity and high adhesive properties compared to the bisphenol A-type epoxy resin. Therefore, bisphenol F-type epoxy resins are generally used in places where low viscosity or impregnation properties are required. The cargo properties, crystallinity, compatibility, curing rate, and thermal stability of bisphenol F-type epoxy resin are similar to those of bisphenol A-type epoxy resins, and there are advantages of low viscosity, high reactivity, plasticity and excellent compatibility with other resins.

The bisphenol A type epoxy resin and the bisphenol F type epoxy resin according to an embodiment of the present invention are all made of a 100% solids solvent-free type (VOC's Free) resin, which is environmentally friendly and has the effect of improving work safety. Bisphenol F-type epoxy resin can contribute to exhibit superior adhesive performance of the functional coating agent when the content in the main ingredient is 6 to 7 wt%, and if it is contained too much or too little outside this, the adhesive performance of the functional coating agent can be reduced. .

alkyl glycidyl ether

C12-C14 alkyl glycidyl ether is a reactive (reaction with curing agent) diluent that lowers the viscosity of diglycidyl ether of bisphenol A type epoxy resin, and has a similar effect to benzene and methanol. Alkyl glycidyl ether may contribute to exhibit superior adhesive performance of the functional coating agent at an amount of 6 to 7 wt% in the main ingredient, and if it is contained too much or too little outside this, the adhesive performance of the functional coating agent may be reduced. .

propylene glycol monomethyl ether acetic acid

Propylene Glycol Monomethyl Ether Acetate (PMA) is an eco-friendly solvent used in electronic solvents such as photoresists, semiconductors and LCDs, industrial cleaners, paints, ink solvents, adhesives, and various resins. Methyl ether acetic acid may contribute to exhibiting superior adhesive performance of the functional coating agent at a content of 0.25 to 0.28% by weight in the main ingredient, and if it is contained too much or too little outside this, the adhesive performance of the functional coating agent may be deteriorated.

mica statue iron oxide ( MIO , Micaceous Iron Oxide )

According to an embodiment of the present invention, an inorganic mica-like iron oxide is impregnated into the main material. The mica-like iron oxide pigment MIO, which provides rust prevention properties by shielding the penetration of moisture in heavy-duty coatings, is a natural mineral obtained from hematite with a high Fe203 content. ) of flakes with a metallic luster. Such Flaky lamella particles are arranged parallel to the surface and have a barrier effect that not only strengthens the coating film but also blocks environmental harmful factors such as moisture, salt, and ultraviolet rays. In the example of the present invention, mica-like iron oxide powder having an average particle size of 100 μm was selected. MIO paint using MIO as a pigment increases water resistance by lining up in the paint film because the pigment is flaky. It has characteristics such as no concern about delamination, thick coating, high light reflection effect, and high weather resistance. The mica-like iron oxide may contribute to exhibit superior adhesive performance of the functional coating agent at an amount of 64 to 66% by weight in the base material, and if too much or too little is contained outside this, the adhesive performance of the functional coating agent may be deteriorated.

titanium dioxide ( TiO2 )

According to an embodiment of the present invention, titanium dioxide, an inorganic material, is impregnated into the base material. Titanium dioxide has a large hiding power, so it is insoluble in almost all solvents, exhibits a very large refractive index, and exhibits high scattering properties. Being a very stable material, it improves hiding power, weather resistance, and discoloration resistance to heat or light. In this example, titanium dioxide powder having an average particle size of 0.36 μm was selected. Titanium dioxide may contribute to exhibiting superior adhesive performance of the functional coating agent at a content of 6 to 7 wt % in the main ingredient, and if too much or too little is contained outside this, the adhesive performance of the functional coating agent may be deteriorated.

benzyl alcohol ( Benzyl alcohol )

Benzyl alcohol is an aromatic alcohol with a molecular weight of 108.14 with the formula C6H5CH2OH. It is a colorless and transparent liquid with a soft, sweet smell. Due to its low water solubility, it is almost decomposed in water and easily soluble in alcohol and ether. It reacts with an acid such as acetic acid to form an ester compound. Benzyl alcohol may contribute to exhibiting superior adhesive performance of the functional coating agent when the content in the curing agent is 35 to 45 wt %, and when too much or too little is contained outside this, the adhesive performance of the functional coating agent may be reduced.

isophorone diamine

Isophorone diamine is used as a curing agent for epoxy paints to improve workability because it is a modified alicyclic amine and has a low viscosity. In particular, it reacts with an epoxy resin to form a glossy coating, so it has excellent gloss stability and is strong against chemical components such as acids and alkalis, so it is widely applied to places requiring chemical resistance and has excellent physical and mechanical performance. Isophorone diamine may contribute to exhibit superior adhesive performance of the functional coating agent at an amount of 20 to 30 wt % in the curing agent, and if too much or too little is contained outside this, the adhesive performance of the functional coating agent may be reduced.

meta -xylene-alpha, alpha- diamine

Meta-xylene-alpha and alpha-diamine have excellent water resistance and chemical resistance, and have a fast curing rate. For detailed uses, it is used for epoxy flooring, epoxy heavy-duty paint, and the wing side of wind power generators, and it is also used by adduction or mixing with other hardeners. Meta-xylene-alpha, alpha-diamine can contribute to exhibiting superior adhesive performance of the functional coating agent when the content in the curing agent is 20 to 30% by weight. can lower it

salicylic acid

Salicylic acid corresponds to o-oxybenzoic acid and has the formula C7H603. It has a molecular weight of 138.12, a melting point of 159 degrees Celsius, a specific gravity of 1.443, and is sublimable, and is soluble in organic solvents such as ether and ethanol. Salicylic acid may contribute to exhibiting superior adhesive performance of the functional coating agent when the content of the curing agent is 5 to 15% by weight, and if too much or too little is contained outside of this, the adhesive performance of the functional coating agent may be deteriorated.

mixing equipment

According to an embodiment of the present invention, a main component consisting of bisphenol A type epoxy resin, bisphenol F type epoxy resin, alkyl glycidyl ether, propylene glycol monomethyl ether acetic acid, mica-like iron oxide, and titanium dioxide constituting the functional coating agent, and benzyl alcohol A paste mixer was used to mix the curing agent composed of , isophorone diamine, meta-xylene-alpha, alpha-diamine, and salicylic acid while evenly dispersed. It is a high-viscosity mixing and degassing device that operates both revolution and rotation at the same time and uses centrifugal force, centripetal force, and friction force to enable mixing and bubble removal without the internal impeller in existing mixing equipment.

Measure each material according to a pre-determined mixing ratio and mix it in a container dedicated to the paste mixer. At this time, since salicylic acid does not dissolve well, it is preferable to mix it with benzyl alcohol in advance (Pre-Mix) and then mix it in the dedicated container of the paste mixer.

On the other hand, as shown in Figures 2 and 3, the polymer lining inner tube spray molding step (S30) prepares a high toughness lining material based on polyurea and polymer lining it over the anticorrosive coating layer 100 and spray-applying a solvent-free high toughness polymer using a high toughness polymer supply device and a high toughness polymer injection device so that the inner tube 200 is molded.

Here, the polyurea-based high toughness polymer preferably has a tensile strength of 28 MPa or more.

Accordingly, as shown in FIG. 8, the high toughness polymer is rapidly cured on the top of the anticorrosive film layer 100 by the step 30 so that the polymer-lined inner tube 200 is formed independently and integrally directly at the job site. By doing (for example, in the prior art, it was necessary to insert a separate PE material-shaped pipe into the inside of the existing pipe), the existing water supply pipe 10 can be structurally reinforced, and the polymer lining is seamless even at branch points and curved pipe parts. By making the inner pipe 200 easy to form, the reconnection work of the branch pipe can be made unnecessary, and the construction period can be shortened.

At this time, if the high toughness polymer forming the polymer-lined inner pipe 200 according to step 30 is directly sprayed on the inner circumferential surface of the existing water supply pipe 10 without going through step 20, the high toughness polymer is a water surface, a melt surface and Since it cannot be properly attached to the same wet surface, through step 20, a solvent-free type anti-corrosion coating with excellent adhesion even on the wet surface is first sprayed on the inner peripheral surface of the existing water supply pipe 10, and then the anticorrosive film layer 100 is It is to be formed so that the high toughness polymer is spray-applied through the anticorrosive film layer 100 .

It is preferable to use the high toughness polymer injection device having a capacity of 7.8 ℓ/min.

On the other hand, the subject of the polymer used in the spray molding step (S30) of the polymer lining inner pipe is 90 to 95 wt% of MDI-polypropylene glycol copolymer, and 5 to 10 wt% of propylene carbonate, and the polymer lining inside The curing agent of the polymer used in the pipe spray molding step (S30) is 50 to 60 wt% of polydiamine, 5 to 15 wt% of glycerol tris ether, 20 to 30 wt% of diethyltoluenediamine, and 1 to 5 wt% of titanium dioxide It is preferably made up of % by weight.

Accordingly, as shown in FIG. 10, by preparing a new concept eco-friendly high toughness polymer and spraying it on the top of the anticorrosive coating layer 100, the existing water supply pipe 10 inside the existing water supply pipe 10. The high-strength polymer-lined inner tube 200, which achieves structural reinforcement and the method of

Although the technical aspects have been described above and in the accompanying drawings, the technical idea of the present invention is for the description, and does not limit the invention, and those of ordinary skill in the art It will be understood that various modifications and changes of the present invention can be made without departing from the technical scope of the present invention as set forth in the claims to be described below.

100: anticorrosive film layer 200: polymer lining inner tube

Claims (3)

A high-pressure water tube and surface treatment step of removing the existing coating layer on the inner peripheral surface of the existing water supply pipe 10 and washing with high-pressure water (S10);
After the high-pressure water tube and surface treatment step (S10) of the existing water supply pipe, spraying an anticorrosive coating agent as a primer on the inner peripheral surface of the existing water supply pipe 10 to form an anticorrosive coating layer 100 (S20); and
After the anticorrosive coating layer spray forming step (S20), the polymer lining inner tube 200 is formed on the anticorrosive coating layer 100 by spray coating and lining molding (S30);
including,
The polymer used in the spray molding step (S30) of the polymer lining inner tube consists of 90 to 95% by weight of MDI-polypropylene glycol copolymer and 5 to 10% by weight of propylene carbonate,
The polymer curing agent used in the spray molding step (S30) of the polymer lining inner pipe is 50 to 60 wt% of polydiamine, 5 to 15 wt% of glycerol tris ether, 20 to 30 wt% of diethyltoluenediamine, and dioxide High-strength lining method for spray-type water supply pipe, characterized in that it consists of 1 to 5% by weight of titanium. The method of claim 1,
The subject matter of the anticorrosion coating agent used in the anticorrosive coating layer spray forming step (S20) is 10 to 15% by weight of bisphenol A type epoxy resin, 6 to 7% by weight of bisphenol F type epoxy resin, and alkyl glycidyl ether 6 -7% by weight, 0.25-0.28% by weight of propylene glycol monomethyl ether acetic acid, 64-66% by weight of mica iron oxide, and 6-7% by weight of titanium dioxide,
The curing agent of the anticorrosive coating agent used in the anticorrosive coating layer spray forming step (S20) is a spray type, characterized in that it consists of benzyl alcohol, isophorone diamine, meta-xylene-alpha, alpha-diamine, and salicylic acid. Water pipe high-strength lining method. delete

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