KR102236249B1 - Manufacturing method of impregnating tubes for water and sewage pipes using eco-friendly odorless UME resin - Google Patents

Abstract

The present invention relates to a method for manufacturing impregnating tubes for water and sewage pipes using eco-friendly odorless UME resin, and more particularly, to a novel concept technology that solves the problems of curing the epoxy resin composition used in the impregnated tube for repair of water and sewer pipes, while ensuring high hardness and flexibility, and improving overall physical properties. The present invention relates to a method for manufacturing impregnated tubes for water and sewage pipes using eco-friendly odorless EMU resin, in which an epoxy resin composition is composed of a main agent part, a curing agent part, and an additive part, and the method has a first feature in which the main agent part includes three types of epoxy resins having different properties, and also has a second feature in which the curing agent part includes an acid anhydride, polypropylene glycol, and a curing accelerator unlike the related art.

Description

Manufacturing method of impregnating tubes for water and sewage pipes using eco-friendly odorless UME resin}

The present invention relates to a new concept of technology that has high hardness, secures flexibility, and improves overall physical properties while solving problems during curing of an epoxy resin composition used in a reinforcing tube for water and sewage pipe repair.

Water supply pipes that supply water or sewage pipes that discharge wastewater such as domestic sewage, livestock wastewater, and industrial wastewater are damaged or deteriorated when used for a long period of time due to cracks, damage, and poor connection, causing wastewater to be discharged to the outside. , It pollutes rivers, soil, living environment, or causes severe odor in urban roads.

If the water and sewage pipes are seriously deteriorated, the water and sewage pipes must be replaced with the excavation method, but the excavation method takes a lot of time and cost, causes traffic congestion, and damages nearby buildings due to ground subsidence. As problems arise, it is desirable to use a non-drilling method that can repair water and sewage pipes immediately.

The non-excavation type water and sewage pipe repair method is a technology that is performed for the purpose of preventing water intrusion or leakage from cracks, damage, etc., or lack of watertightness of water and sewage pipe facilities, and there are largely injection method, link method, and cooking method. Methods of reinforcing defects such as damage and cracks in existing pipes from the inner surface of the pipe are largely divided into a forming method, an inversion method, and a liner method.

In addition, when the strength of the existing pipe is extremely reduced due to damage, corrosion, abrasion, etc., or the water supply and sewage pipes are deformed and the water flow capacity of the water supply and sewage decreases due to lack of cross section, even if a new pipe is inserted and replaced, it acts as a water supply and sewage system. If this is insufficient, there are rehabilitation methods, reconstruction and maintenance methods, etc., which are performed for the purpose of restoring their functions.

The present invention is a non-drilling water and sewage pipe repair method using an inversion method, by inverting (inverting and entering) a reinforcing tube (impregnated tube) into the old or damaged water and sewage pipes with air pressure or water pressure. It relates to an epoxy resin composition impregnating a nonwoven fabric of a reinforcing tube to be cured after bonding a new composite tube.

In the non-digging reversing method, a reinforcing tube (impregnated tube) with a film such as polyethylene or polypropylene attached to the outside of a layer impregnated with an epoxy resin composition on a nonwoven fabric is reversely inserted by pneumatic or hydraulic pressure (reinforcing the reinforcing tube by pneumatic or hydraulic pressure). Turn over and forcibly insert into the old water and sewage pipes so that the surface of the nonwoven fabric impregnated with the epoxy resin composition comes into contact with the inner walls of the water and sewage pipes, and the polyethylin or polypropylene film comes into contact with water, that is, water or sewage), It is to harden after forming a new composite pipe (reinforcing tube) on the inner wall of water and sewage pipes. The schematic structure of the reinforcing tube using the non-drilling inversion method is shown in FIG. 1.

Most of the existing resin compositions for water and sewage pipe repairs mainly use a method of curing by mixing only one type of epoxy resin, urethane resin, and polyester resin as the main part, and mixing suitable curing agents and other additives thereto.

However, since the epoxy resin composition has a high hardness after curing, cracks occur, or due to shrinkage during curing, there is a problem in that workability is poor due to the occurrence of lift on the bonding site. To solve this problem, polypropylene glycol diglycidyl Although ether-modified synthetic products are sometimes added to the epoxy resin composition, it is not possible to obtain a reinforcing tube with satisfactory overall properties (refer to Korean Patent No. 1445259, Utility Model Registration No. 352875, etc.).

In addition, a composition containing a polyester resin as the main part has a strong odor, weak alkali resistance, and, like the epoxy resin composition, shrinkage problems occur during curing, resulting in poor adhesion, and the impregnation speed is slow and impregnation due to the need to use a high-viscosity resin. There is a problem in that the effect is weak, resulting in molding defects.

In addition, the composition containing the urethane resin as the main part is flexible, so the problem of shrinkage during curing is somewhat alleviated, but the problem of not maintaining the shape due to the viscoelasticity of the urethane occurs during long-term use. ·Sewage water is discharged back to the outside, resulting in a problem of polluting the environment (refer to Korean Patent No. 1530862, etc.).

[Patent Document 0001] Korean Patent Registration No. 1445259 (2014. 09. 22.) [Patent Document 0002] Korean Utility Model Registration No. 352875 (2004. 06. 01.) [Patent Document 0003] Korean Patent Registration No. 1530862 (2015. 06. 17.)

The present invention is to solve the problems of the existing resin composition, and without causing problems during curing, it is possible to secure high hardness and flexibility, and use an inversion method that has excellent overall physical properties such as workability and mechanical properties. It is intended to provide an epoxy resin composition used in the reinforcing tube of the non-drilling water and sewer pipe repair method.

It is an object of the present invention to provide an epoxy resin composition used for impregnating the non-woven fabric of a non-excavated water and sewage pipe reinforcing tube by a reversal method having excellent overall physical properties after curing.

The present invention relates to an epoxy resin composition used in a reinforcing tube for repairing non-drilling water and sewer pipes using an inversion method, wherein the epoxy resin composition is composed of a main part, a hardener part, and an additive part, and the main part is three types of different properties. The first feature is that it is composed of an epoxy resin, and the second feature is that the curing agent part is composed of an acid anhydride, polypropylene glycol, and a curing accelerator unlike the conventional one.

The present invention relates to an epoxy resin composition for impregnating a non-woven fabric of a reinforcing tube (impregnated tube) for repairing a non-drilling water and sewer pipe using an inversion method.

The reinforcing tube (impregnated tube) for repairing non-drilling water and sewer pipes using the inversion method of the present invention is obtained by laminating a film such as polyethylene or polypropylene on the outer surface of a cylindrical nonwoven fabric impregnated with an epoxy resin composition. Claims are made to include the epoxy resin composition, the reinforcing tube to which the same, and the construction method thereof.

In the present invention, by mixing and using three types of epoxy resins with different properties as an epoxy resin, the control range of mechanical properties (the window of properties) is significantly wider than in the prior art, and as a curing system, an acid anhydride, polypropylene glycol, and a curing accelerator are used. By changing to a curing system made of, it can be seen that the viscosity stability of the resin composition is remarkably increased, the pot life is extended, and the mechanical properties are also significantly improved compared to the conventional one.

1 is a schematic structure of a reinforcing tube using a non-drilling inversion method

Concrete components of the epoxy resin composition for impregnating the nonwoven fabric of the reinforcing tube of the water and sewage pipe repair method using the inversion method of the present invention are as follows.

The epoxy resin composition of the present invention is composed of a main part, a curing agent part, and an additive part.

The epoxy resin composition of the present invention includes a main part composed of all three types of epoxy resins having different properties, an acid anhydride, polypropylene glycol, and a curing agent part (curing system) composed of a curing accelerator, and an additive part, a defoamer, a dispersant, It is characterized by comprising an adhesion promoter, a colorant, and a filler.

In particular, the present invention is characterized by applying a curing agent portion (curing system) consisting of an acid anhydride, polypropylene glycol and a curing accelerator without using a conventional amine curing agent, and impregnating the nonwoven fabric of the reinforcing tube for water and sewage pipes. The use of such a curing agent part (curing system) for the purpose was found by the present inventors from a long construction experience. In the case of employing such a curing agent part, the viscosity of the curing agent generated when an amine curing agent is used as a curing agent for conventional epoxy resins. It is characterized in that it is possible to solve the problem of curing during storage and increase of.

), 비스페놀 A형 에폭시 수지(When explaining the present invention in detail, the main part composed of three types of epoxy resins having different properties of the present invention is a phenol noblock type epoxy resin (

), bisphenol A type epoxy resin (

), 우레탄 마더파이드(modified) 에폭시 수지(UME 수지,

)를 모두 포함하여 구성되는데, 1종류의 에폭시 수지만을 사용하는 것에 비해 3종류의 수지를 모두 포함함으로 인해, 경화 후 다양한 물성의 발휘가 가능해지고, 또한 경도도 적절히 낮출 수 있으며, 계절이나 시공지역의 온도나 습도에 따라 3종류의 함량비를 달리 함에 의해 시공성이 현저히 향상될 수 있는 것으로서, 종래 1종류의 에폭시 수지, 폴리에스테르 수지 또는 우레탄 수지만을 주제부로 사용하는 경우에는 달성하기 어려운 다양한 물성 및 유연한 시공성을 달성할 수 있는 것이다.

), urethane modified epoxy resin (UME resin,

), but since it contains all three types of resins compared to using only one type of epoxy resin, various physical properties can be exhibited after curing, and hardness can be appropriately lowered, and season or construction Workability can be remarkably improved by varying the three types of content ratio depending on the temperature or humidity of the region, and it is difficult to achieve when only one type of epoxy resin, polyester resin, or urethane resin is used as the main part. It is possible to achieve physical properties and flexible constructability.

The main part including all three types of epoxy resins of the present invention is 40 to 60% by weight relative to the total solid content of the epoxy resin composition, and there is no sudden change in physical properties when it is outside the above range, but the nonwoven fabric of the reinforcing tube is impregnated with the resin composition. When the concentration is less than 40% by weight, the impregnation property (impregnation rate) is lowered, and when it exceeds 60% by weight, the viscosity becomes excessively high, so that the impregnation property (impregnation rate) decreases.

The weight average molecular weight of the novolak type epoxy resin, bisphenol A type epoxy resin, and urethane-modified epoxy resin of the main part is appropriate in the range of 15,000 to 30,000, but the weight average molecular weight is in the above range depending on the content ratio, solid content, and composition of the curing agent part. It can be appropriately adjusted within the range that does not deviate significantly. If the weight average molecular weight of the epoxy resin is less than 15,000 or exceeds 30,000, it becomes difficult to control the mechanical properties of the reinforcing tube after curing.

As described above, the first feature is that the main part of the epoxy resin composition of the present invention includes all three types of epoxies with different physical properties. On the contrary, when only phenol novolac-type epoxy resin is used as the main part, it is cured. After the reinforcing tube's tensile strength and flexural strength are excessively increased, the elongation rate is significantly lowered, resulting in shrinkage during curing.In addition, shrinkage of the reinforcing tube occurs in winter, increasing the risk of lifting or breakage, and bisphenol A type epoxy When only the resin is used as the main part, similar problems to the case of using only the phenol novolak type epoxy resin occur, and in the case of using only the urethane modified epoxy resin as the main part, on the contrary, the tensile strength and flexural strength are significantly lower. As it loses, the elongation rate rises rapidly, and if a long period of time has elapsed after repair work, a problem occurs in that the shape cannot be maintained due to the viscoelasticity of the reinforcing tube.

Therefore, the present invention is characterized by employing a main part including all three types of epoxy resins having different physical properties, so that the range of adjustment for controlling the physical properties of the reinforcing tube is remarkably wide, excellent workability, tensile strength, and flexural strength. And by showing an appropriate range of elongation, it is possible to provide an epoxy resin composition for use in a non-drilling water and sewage reinforcing tube using an inversion method capable of achieving overall excellent physical properties.

On the other hand, when high tensile strength is required, such as a reinforcing tube used in the non-drilling method of large water and sewage pipes, a polyamide resin having an aromatic ring in the main chain is used as a polyamide resin having a weight average molecular weight of 10,000 to 20,000. It may contain an additional ~2%. In the case of having an aromatic ring such as a benzene ring in the main chain of the polyamide resin, the tensile strength is remarkably high, and the tensile strength can be increased by directly reacting the primary amine groups at both ends of the polyamide resin with the epoxy resin.

It is not necessary to include polyamide resin in the reinforcing tube of small water and sewer pipes.

Next, as described above, the curing agent part of the present invention is capable of solving the problem of a curing system using an amine curing agent as a curing agent for a conventional epoxy resin, and an acid anhydride, polypropylene glycol instead of an amine curing agent for curing the epoxy resin. And a curing agent part (curing system) made of a curing accelerator.

The inventors of the present invention developed an epoxy resin composition for reinforcing tubes used in water and sewer pipe reinforcement tubes, the cause of which is not known exactly, but if the curing accelerator in use is mixed with an amine curing agent and stored (usually, the curing agent is It was mixed and stored with the curing accelerator), the curing of the curing agent and the increase in viscosity occurred, and it was not possible to solve the problem, but the curing agent part (curing system) of the present invention was employed without using an amine curing agent. This completely solved the problem of the conventional amine curing agent.

For reference, the curing reaction between the conventional epoxy resin and the amine curing agent is as follows.

In addition, the curing reaction of the epoxy resin, acid anhydride, and polypropylene glycol of the present invention proceeds in approximately the following curing mechanism.

As described above, the first feature of the present invention is that the curing system composed of an amine curing agent and a curing accelerator, which is a curing system for an epoxy resin, is changed to a curing system composed of an acid anhydride, a low molecular weight polypropylene glycol, and a curing accelerator. And, although such a curing system may be applied to other technical fields, it is revealed that the present invention is the first to be used for impregnating the non-woven fabric of a reinforcing tube for repairing water and sewer pipes using an inversion method.

As the acid anhydride of the curing agent part of the present invention, there is no particular limitation if it is an acid anhydride such as maleic anhydride (molecular weight 96.06) or MTHPA (methyl tetrahydrophthalic anhydride, molecular weight 166.2), but maleic anhydride is usually used.

The content of the acid anhydride is 10 to 30% by weight relative to the total solid content of the resin composition, based on maleic anhydride, and if it is less than 10% by weight, the curing degree is lowered and the physical properties of the coating film become weak, and if it exceeds 30% by weight, curing is performed. As it progresses excessively, the hardness becomes excessively high, and the pot life (time to work before curing) is shortened, resulting in a sharp weakness in workability and mechanical properties.

In general, room temperature curing of epoxy resins usually requires a temperature of 15℃ or higher, and curing time requires 24 hours or more, so when quick curing or low temperature curing is required, a curing accelerator is used. In some cases, it may be necessary to delay the delay.

The terminal groups with the effect of accelerating hardening that are commonly used are as follows.

End groups with hardening accelerating effect: -OH, -COOH, SO ₃ H, -CONH ₂ , -CONHR, -SO ₃ NH ₂ , SO ₃ NHR

On the other hand, the curing accelerator of the curing agent part of the present invention is characterized by using a curing accelerator containing a urea group substituted with a tertiary amine and an indazole group. Specifically, Kukdo Chemical's KH-3001 is mainly used.

The content of the curing accelerator of the present invention is characterized by containing 1 to 3% by weight relative to the total solid content of the epoxy resin composition, and if the content of the curing accelerator is less than 1% by weight, curing does not proceed sufficiently, resulting in poor mechanical properties, 3 If the weight% is exceeded, hardening proceeds excessively, resulting in excessive and high hardness, shortening the pot life (time to work before hardening), resulting in poor workability. In addition, in the present invention, the ratio of the conventional epoxy resin: amine curing agent was 1 to 5: 1, and by introducing a curing accelerator, the ratio of the epoxy resin: curing accelerator may be a mixing ratio of 20 to 80: 1. The stability over time during the period is dramatically improved.

)은 종래 에폭시 수지의 경화제로 주로 사용되던 아민 경화제의 문제점을 해결하기 위해 본 발명에서 산무수물을 포함하는 경화 시스템으로 변경하면서 최초로 첨가하는 성분으로서 경화 메커니즘은 앞서 도시한 바와 같다.Low molecular weight polypropylene glycol of the curing agent part of the present invention (

) Is a component first added while changing to a curing system containing an acid anhydride in the present invention in order to solve the problem of the amine curing agent, which was mainly used as a curing agent for conventional epoxy resins, and the curing mechanism is as shown above.

The weight average molecular weight of the low molecular weight polypropylene glycol is preferably 800 to 1,200, and the content is appropriate to include 15 to 30% by weight based on the total solid content of the epoxy resin composition. When the content of polypropylene glycol is less than 15% by weight, the hardness is excessively high, and when it exceeds 30% by weight, the viscoelasticity is increased and mechanical properties are deteriorated, so that the shape of the reinforcing tube cannot be maintained during long-term use.

In order to solve the problem of excessively high hardness of an epoxy resin composition comprising an epoxy resin and an amine curing agent, the present invention introduces flexible polypropylene glycol into the curing system. It is possible to provide a reinforcing tube that can respond to all changes.

On the other hand, the weight average molecular weight of the polypropylene glycol is preferably 800 to 1,200, but the weight average molecular weight may vary somewhat depending on the content of the polypropylene glycol is apparent to those skilled in the art.

In other words, the curing agent portion of the present invention does not use an amine curing agent, but employs a curing agent portion (curing system) composed of an acid anhydride, polypropylene glycol and a curing accelerator, which is used to impregnate the nonwoven fabric of the reinforcing tube of water and sewage pipes. The use of such a curing agent part (curing system) was first discovered by the present inventors from a long construction experience, and the present invention increases the viscosity of the curing agent, which occurs when an amine curing agent is used as a curing agent for conventional epoxy resins, and cures during storage. It is characterized in that it can solve the problem that becomes.

Hereinafter, the components of the additive part of the present invention will be described in detail.

Among the components of the additive part of the present invention, the defoaming agent (antifoaming agent) is one that removes bubbles generated inside the resin composition during dispersion or curing, and has an effect of improving some dispersibility, and a fluorine-modified polysiloxane solution is mainly used, the content of which is 0.5 to 3% by weight of the total solid content of the epoxy resin composition is appropriate.

If the content is less than 0.5% by weight, bubbles are generated inside the reinforcing tube after curing, and if the content is more than 3% by weight, there is no increase in the defoaming effect and only the manufacturing cost increases.

Specific examples of the defoaming agent include BYK's BYK-063, BYK-066N, BYK-088, BYK-A 530, and the like, and one or two or more of them may be used in combination, but the present invention is not limited thereto.

In addition, a wetting and dispersing agent is used as the dispersant of the additive part, and relatively high molecular weight anionic compounds, cationic compounds, and electrical neutral compounds are widely used as non-aqueous wetting-dispersing agents, aliphatic carboxylic acids and salts, and higher alcohol-sulfuric acid esters. , Alkyl sulfonates, alkyl phosphate esters, polyester-carboxylic acid salts, polyamine salts of polymer polyester carboxylic acids, aliphatic amine salts, quaternary ammonium salts, long chain polyaminoamides and their phosphates, long chain polyaminoamides Various compounds such as neutral salts of and polymeric polyester acids may be used.

The dispersant is not particularly limited, but it can be used by selecting an appropriate type according to temperature, humidity, and seasonal climate change, and its content is 0.5 to 2% by weight relative to the total solid content of the epoxy resin composition, and if it is less than 0.5% by weight, the dispersing effect There is no increase in the fine aggregation of inorganic components, and if it exceeds 2% by weight, the manufacturing cost only increases without increasing the dispersing effect as in the case of the defoaming agent.

In the present invention, the dispersant mainly uses BYK 110, which is BYK's wet dispersant.

In addition, the adhesion promoter of the additive part includes a silane-based, an inorganic substance-based, and the like. In the present invention, the silane-based Momentive's Silquest A-187 is mainly used.

For reference, non-asbestos-type talc may be used as the inorganic system. In the present invention, since a filler is separately added, an organic silane type is more suitable than an inorganic type adhesion promoter.

The content of the adhesion promoter is appropriate in 0.5 to 2% by weight relative to the total solid content of the epoxy resin composition.If it is less than 0.5% by weight, the viscosity of the epoxy resin composition decreases and the adhesive strength decreases, thereby weakening the adhesion between the reinforcing tube and the old water and sewer pipe acids, If it exceeds 2% by weight, not only the viscosity increases excessively, but also the manufacturing cost increases without increasing the adhesion promoting effect.

In addition, as for the colorant (coloring agent, coloring tonner) of the additive, commonly used titanium dioxide, carbon black, iron oxide pigments include one or more of cadmium red, shining green, carbon black, chrome green, chrome yellow, navigator blue, and shining blue. It can be used in combination of two or more.

The content of the colorant is 3 to 5% by weight relative to the total solid content of the epoxy resin.The colorant also functions as a filler. If it is less than 3% by weight, the coloring effect and physical properties are slightly weakened, and if it exceeds 5% by weight, the effect is increased. Without, only the coating becomes fragile.

In addition, as the filler of the additive part, most commonly used fillers can be used, but calcium carbonate is mainly used in the present invention.

Commonly used fillers are inorganic fillers such as talc, sand, silica, talc, calcium carbonate, etc., reinforcing fillers such as mica, quartz, and glass fiber, and quartz powder, graphite, alumina, and Aerosil. For special purposes such as aluminum, aluminum oxide, iron, iron oxide, copper, etc. or antimony oxide as a metal system, and fine plastic particles (phenolic resin, urea resin, etc.) The same filler can be used.

The content of the filler is appropriate in the range of 5 to 20% by weight relative to the total solid content of the epoxy resin composition.If it is less than 5% by weight, mechanical properties such as strength are weakened, and if it exceeds 20% by weight, the cohesive force of the coating film is rapidly weakened.

Usually, in order to save raw materials, there are many cases of excessive addition of fillers.However, if the filler is excessively added, the coating film becomes brittle and cracks occur in the reinforcing tube due to water pressure in the water supply and sewer pipes, so care should be taken.

In addition, it is obvious that additives that can be additionally included within the scope of the technical common knowledge of a person skilled in the art, such as antioxidants, corrosion inhibitors, biocides, chemical resistant components, etc., can naturally be added to the epoxy resin composition of the present invention, if necessary. Do.

The components of the main part, the hardener part, and the additive part of the present invention were described in detail above, and the storage properties of the epoxy resin composition of the present invention were checked over several months, and the storage stability was remarkably excellent compared to the prior art, and mechanical properties. Also, it was confirmed that it is remarkably superior to the prior art.

Physical properties were implemented in accordance with KSM 3550, etc., and passed the standard.

Hereinafter, a summary of the components of the epoxy resin composition of the present invention is shown in Table 1 below, and the total concentration of the epoxy resin composition is adjusted in the range of 30 to 50% by weight, and the solvent is usually ketones (MEK, Acetone, MIBK, etc.), toluenes, acetates, etc. are used to adjust the total concentration to the above range.

The total concentration of the resin composition can be adjusted in an appropriate range depending on temperature, humidity, seasonal factors, and the environment of the construction site.At low temperatures, the content of the curing agent is increased instead of lowering the total concentration, and at high temperatures, the total concentration is increased. By increasing the content of the curing agent part, the total concentration can be adjusted within the technical common knowledge of a person skilled in the art.

Ingredients content
(Compared to total solids) Subject part

)Novolac-type epoxy resin (

) 40-60% by weight Bisphenol A type epoxy resin
(

) Urethane modified epoxy resin
(

) Hardener part Male anhydride (MA) 10 to 30% by weight Polypropylene glycol (

) 15-30% by weight Hardening accelerator 1 to 3% by weight Additive Defoaming agent 0.5 to 3% by weight Dispersant 0.5-2% by weight Adhesion enhancer 0.5-2% by weight coloring agent 3 to 5% by weight Filler 5-20% by weight ※ (Reference) The resins of the main part of the present invention and the components of the curing agent part may be in liquid or solid form, and it is preferable to use the same as supplied from the raw material supplier for the purpose of storage or dispersibility.

Hereinafter, the first and second characteristic configurations of the present invention will be described in detail through examples and comparative examples, and the scope of the present invention is not limited to the scope of the embodiments.

In addition, the scope of the present invention will naturally include a range of constituents that can be recognized as equivalents to those skilled in the art.

Hereinafter, examples and comparative examples of the present invention will be described in detail.

[ Example ]

The main part of the epoxy resin composition is a phenol novolak type epoxy resin (Kukdo Chemical, YPDN 630), a bisphenol A type epoxy resin (Kukdo Chemical, YD 128), and a urethane modified epoxy resin (Kukdo Chemical, UME 305 resin). Each was made into 17 parts by weight, and the total was made into 51 parts by weight.

The curing agent part consisted of 20 parts by weight of male anhydride (Kukdo Chemical, HJ220M), 20 parts by weight of polypropylene glycol (Kumho Petrochemical, PPG-1000), and 2 parts by weight of a curing accelerator (Kukdo Chemical, KH3001).

The additive part is a defoamer (BYK, BYK 066N) 2 parts by weight, a dispersant (BYK, BYK 110) 1.5 parts by weight, an adhesion promoter (Momentive, SiRequest A-187) 1.5 parts by weight, a coloring agent (titanium dioxide, TiO) ₂ ) 4 parts by weight, and 15 parts by weight of the filler (calcium carbonate, CaCO _{3 ).}

As a solvent for adjusting the concentration of the epoxy resin composition to 40% by weight, a mixed solvent in which MEK (methyl ethyl ketone): toluene: ethyl acetate was mixed in a ratio of 1:1: 1 (weight ratio) was used.

The order of preparation of the epoxy resin composition is to add three types of epoxy resins (liquid) as the main part to the impeller mixer, add an appropriate amount of the above mixed solvent, if necessary, and then add a pre-prepared curing agent part (three components of the curing agent part in the same way. (Prepared by mixing in advance) is added, and the constituents of the total prerequisite are sequentially added while adding an appropriate amount of mixed solvent, followed by mixing and dispersing to prepare.

An impeller mixer is sufficient as the disperser, and if necessary, it may be prepared by mixing and dispersing using a highly dispersing dispersing machine such as a sand mill or a dyno mill.

Curing for evaluation of mechanical properties was ^{performed at 100 o} C for 4 hours.

[ Comparative example One]

It evaluated in comparison with the prior art described in the background art of the present invention (Korean Patent No. 1445259). For reference, in the prior art, the epoxy resin composition has a high hardness after curing, which causes cracks. The ether-modified synthetic product was added to the epoxy resin composition.

The physical properties of the epoxy resin composition are as shown in Table 2 below. The viscosity after 2 days is the viscosity after leaving the epoxy resin composition at room temperature for 2 days.

[ Comparative example 2]

As in Example 1, except that 51 parts by weight of a phenol novolak type epoxy resin (Kukdo Chemical, YPDN 630) was used as the main part in Example 1.

[ Comparative example 3]

The same as in Example 1, except that 51 parts by weight of bisphenol A epoxy resin (Kukdo Chemical, YD 128) was used as the main part in Example 1.

[ Comparative example 4]

In Example 1, the same as in Example 1, except that 51 parts by weight of a urethane motherfied epoxy resin (Kukdo Chemical UME 305) was used as the main part.

Test result Evaluation item unit Comparative Example 1 Example Test Methods Liquid Viscosity mpa· 2,000 1,500 KSM 3550-7:2013 Viscosity (after 2 days) mpa· 2,500 1,550 Pot life hr 28 48 After curing The tensile strength N/mm ² 19.1 28.0 KSM 3006-2003 Flexural strength N/mm ² 9.38 15.2 KSM 3015-2003 Elongation % 45 70 KSM 3006-2003

Test result Evaluation item unit Example Comparative Example 2 Comparative Example 3 Comparative Example 4 Test Methods Liquid Viscosity mpa· 1,500 1,520 1,530 1,480 KSM 3550-7:2013 Viscosity (after 2 days) mpa· 1,550 1,530 1,542 1,483 Pot life hr 48 47 47 46 After curing The tensile strength N/mm ² 28.0 38 39 22 KSM 3006-2003 Flexural strength N/mm ² 15.2 22 24 13 KSM 3015-2003 Elongation % 70 50 48 90 KSM 3006-2003

The evaluation methods (test methods) in Tables 2 and 3 are not only described in detail in the prior art, but also because this is a conventional evaluation method of a resin composition, a detailed description thereof will be omitted.

As can be seen from Table 2, the epoxy resin composition of the present invention uses a mixture of three types of epoxy resins, and the curing system is different from the conventional one, so that the aging stability of the viscosity (viscosity after 2 days) is remarkably compared to the conventional one. It is excellent, and therefore, the pot life (the time when the construction work is possible before completely hardening occurs) is significantly longer, and it can be confirmed that the mechanical properties such as tensile strength, flexural strength and elongation are comprehensively excellent.

In addition, as can be seen in Table 3, in the case of using one type of epoxy resin as the main part, in the case of Comparative Examples 2 and 3, the tensile strength and flexural strength of the reinforcing tube after curing were excessively increased, and the elongation rate was significantly lowered. During winter, shrinkage occurs, and the reinforcing tube shrinks in winter, which increases the risk of lifting or breakage. Therefore, it is not possible to obtain a reinforcing tube that exhibits overall excellent physical properties.

In addition, in the case of using only urethane modified epoxy resin as the main part, on the contrary, the tensile strength and flexural strength are significantly lowered and the elongation rate is excessively high, and the shape cannot be maintained due to the viscoelasticity of the reinforcing tube after a long period of repair work. Therefore, it is impossible to obtain a reinforcing tube that exhibits comprehensively excellent physical properties.

As described above, the first technical feature of the present invention is that it is possible to provide a reinforcing tube for repairing water and sewage pipes that exhibits comprehensively excellent physical properties by including all three types of epoxy resins having different physical properties as a main part, In addition, by changing the curing system conventionally applied to the reinforcing tube for water and sewage pipe repair to a curing system composed of acid anhydride, polypropylene glycol, and curing accelerator, it is possible to solve the problem of deteriorating the aging stability of the amine curing agent. The second technical feature is that the problem of conventional epoxy resins in which hardness is excessively increased can be solved by controlling the flexibility of the reinforcing tube with propylene glycol.

On the other hand, in the above embodiment, only an example of the content ratio is described, but the basic functions or actions of each of the components of the present invention are known to those skilled in the art. Since it is sufficiently predictable that pot life and mechanical properties can be secured, the excellent effects of the present invention can be confirmed even if the description of the repetitive embodiments with different content ranges is omitted.

Claims (9)

It relates to a method of manufacturing an impregnated tube for water and sewage pipes,
The epoxy resin composition includes a main part, a curing agent part, and an additive part,
The main part includes all of a novolak type epoxy resin, a bisphenol A type epoxy resin, and a urethane-modified epoxy resin,
The curing agent part contains an acid anhydride, polypropylene glycol and a curing accelerator,
The additive part contains a defoamer, a dispersant, an adhesion promoter, a colorant and a filler,
Based on the total solid content of the epoxy resin composition,
The main part contains 40 to 60% by weight of a novolak type epoxy resin, a bisphenol A type epoxy resin, and a urethane-modified epoxy resin in the same ratio,
The curing agent part contains 10 to 30% by weight of an acid anhydride, 15 to 30% by weight of polypropylene glycol, and 1 to 3% by weight of a curing accelerator,
The additive part includes 0.5 to 3% by weight of a defoamer, 0.5 to 2% by weight of a dispersant, 0.5 to 2% by weight of an adhesion promoter, 3 to 5% by weight of a colorant, and 5 to 20% by weight of a filler,
In the epoxy resin composition, the weight average molecular weight of the novolak type epoxy resin, the bisphenol A type epoxy resin, and the urethane-modified epoxy resin of the main part is 15,000 to 30,000,
The acid anhydride of the curing agent part is maleic anhydride (MA), the weight average molecular weight of polypropylene glycol is 800 to 1,000, and the curing accelerator contains a urea group substituted with a tertiary amine and an indazole group,
The defoamer of the additive part is fluorine-modified polysilonic acid, the dispersant is a non-aqueous wetting and dispersant, the adhesion promoter is silane, the colorant is titanium dioxide, and the filler is calcium carbonate. Sewer pipe impregnation tube manufacturing method.
delete delete The method of claim 1,
The epoxy resin composition is an eco-friendly odorless UME resin, characterized in that the total concentration of the epoxy resin composition is in the range of 30 to 50% by weight by adding a mixed solvent of MEK: toluene: ethyl acetate = 1: 1: 1 (weight ratio). Water and sewage pipe impregnation tube manufacturing method used.
The method of claim 1,
In the main part of the epoxy resin composition, a polyamide resin having a weight average molecular weight of 10,000 to 20,000, further comprising 1 to 2% of a polyamide resin having an aromatic ring in the main chain. Sewer pipe impregnation tube manufacturing method.
An eco-friendly odorless Ume manufactured by impregnating a cylindrical nonwoven tube with the epoxy resin composition according to any one of claims 1, 4, and 5, and then laminating a polyethylene or polypropylene film on the outer surface of the impregnated cylindrical nonwoven fabric. Water and sewage pipe impregnation tube manufacturing method using resin.
delete delete A non-excavation type water and sewage pipe repair method using an inverted method using an impregnated tube manufactured by the manufacturing method of claim 6.

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