KR101445259B1 - Soft component epoxy resin composition for repairing non-excavatingsewer pipe - Google Patents

Abstract

The present invention relates to a soft epoxy resin composition for repairing a non-excavating water pipe. A common epoxy composition for reinforcing a water pipe is a thermosetting resin having low softness, and during cooling after curing a liner by heating, contraction of impregnated tube occurs frequently. Accordingly, the tube is delaminated from the inner surface of a repaired pipe at various points, and the reinforcing properties of old pipes may be deteriorated. The present invention provides a soft epoxy resin composition including a main part of a soft liquid epoxy resin obtained by adding a defoaming agent to a mixture of 50-60 wt% of a liquid epoxy resin, which is a reaction product of bisphenol-A and epichlorohydrin, and 40-50 wt% of a polypropylene glycol diglycidyl ether modified product; and an aliphatic modified amine type curing part obtained by mixing 90-95 wt% of an aliphatic modified amine type curing agent, 5-10 wt% of a curing accelerator, and a defoaming agent. By using the soft epoxy resin composition, the contraction of a tube that may occur during cooling after heating and curing in repair of a pipe can be minimized, and the delamination from the inner surface of the repaired pipe can be effectively prevented. In addition, the soft epoxy resin composition is appropriate for repairing a water pipe because it contains no harmful components to a human body and is tasteless and odorless. Particularly, the soft epoxy resin composition ensures satisfactory repairing results when applied, because it has excellent elongation rate and adhesion properties.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a soft epoxy resin composition for repairing non-excavating sewer pipes,

The present invention relates to an epoxy resin composition for repairing irrigation / sewage pipes, and more particularly, to an epoxy resin composition for repairing sewage and sewage, which is capable of minimizing shrinkage in a process of heating and curing an epoxy resin composition, The present invention relates to a flexible epoxy resin composition for repairing unreacted phases and sewage pipes, which can obtain satisfactory construction results, for example, excellent adhesion and adhesiveness to the inner surface of a maintenance pipe and prevent lifting from the inner surface of the repair pipe.

In general, the amount of water on the earth is estimated to be about 1.3 billion,. This water covers about 71% of the surface of the earth in the form of sea, river, lake, and river, and a considerable amount of groundwater .

Also, our human beings are made up of about 70% of water, and all organisms are composed of a considerable amount of water, so water is a very valuable resource for our human beings and living creatures.

In order to use clean and clean water that is indispensable or to use sewage in most countries, water pipes and sewers are buried underground in most countries and installed in many places such as apartments, buildings, hospitals, factories They are sent or discharged by sewage.

However, our precious drinking water source is being lost as water leakage due to the defects such as installation faults and damages of the water supply facilities, and rust caused by corrosion is causing the tap water to be polluted.

The amount of leaking water generated from this wastewater is estimated to be 1 billion tons per year and close to 20% of the total production. The economic loss amounts to 500 billion won per year, and the economic water loss leads to the depletion of valuable water resources of our people. It is a very unfortunate thing to go.

Also, in the case of sewage pipes that discharge domestic wastewater and manure or various livestock wastewater and industrial wastewater, when the burial period is prolonged, a large amount of domestic sewage and industrial wastewater is leaked due to failure or breakage due to deterioration Rivers, rivers and soils are severely polluted.

If the water pipes and sewage pipes are seriously damaged due to aging, it is necessary to excavate old and sewage facilities and replace them with new ones. However, this takes time and requires a lot of replacement cost. Therefore, ㆍ It can be said that it is desirable to repair the sewer immediately.

However, existing conventional excavation and repair method takes a long period of construction, induces traffic congestion, and causes social indirect loss such as building loss due to subsidence.

For this purpose, a non-excavated upper and drainage repair method has been developed and used to form a new composite pipe in a sewer pipe by inserting a reinforcement tube into an old pipe where cracks are generated without digging the ground.

The unreached water and sewer repair work is a technique that is carried out for the purpose of preventing infiltration water or leakage from the lack of watertightness of the water supply and drainage system of the water supply and sewage pipe system, cracks and breakage, and there are injection method, link method and cooking method, Methods for reinforcing defects such as pipe breakage and cracks from the inner surface of the pipe include a forming method, an inversion method, and a liner method.

In addition, when the strength of the existing pipe is extremely lowered due to breakage, corrosion, abrasion, or when the water or sewage capacity of the sewerage pipe is reduced due to deformation or shortage of the sewer pipe, And a rehabilitation method, a reconstruction maintenance method, and the like, which are carried out for the purpose of restoring the function when it is insufficient.

In the above method, a tube made by impregnating a non-woven fabric, which is a fibrous material, with an epoxy resin composition, is replaced with water and air pressure on the inner surface of the existing pipe without replacing the existing pipe, and then the pipe is cured by pressing and heating. Unsaturated polyester resin is usually used as the epoxy resin composition in the case of the rejuvenation method performed for the purpose.

However, since the unsaturated polyester resin has a high odor, low alkali resistance, shrinkage at the time of curing, cracking, low adhesive strength and high viscosity, so that the impregnation speed is slow and the impregnation effect is weak, Defects will occur.

To this end, the applicant of the present application filed a patent application entitled " Prior Art 1 ", hereinafter referred to as " Epoxy resin composition impregnated tube for reinforcement of upper and lower pipes ", in Korean Utility Model Registration No. 20-0352875 Has been developed and registered.

In the prior art 1, the epoxy resin composition is prepared by mixing 60 to 70% by weight of an epoxy resin which is a reaction product of bisphenol-A and epichlorohydrin, 25 to 35% by weight of a phenol novolak resin prepared from alkylphenol and formaldehyde, , And 5 to 10% by weight of an aliphatic polyglycidyl ether epoxy resin (D / P).

In the above-mentioned prior art 1, an epoxy resin, which is a reaction product of bisphenol-A and epichlorohydrin, has a very high mixed viscosity of from 11500 to 13,500 (CPS) at 25 DEG C, so that workability is poor, The use of an aliphatic polyglycidyl ether epoxy resin as an additive deteriorates the physical properties of curing. Especially, when exposed to sunlight for a long period of time at normal temperature and atmospheric pressure, it generates nitrogen oxides and photochemical reactions in the air to generate air pollutants such as ozone and pan There is a problem that a large amount of volatile organic compounds (VOC), which is a toxic volatile organic compound having a carcinogenic component, is generated.

In order to solve the above-mentioned problems, the applicant of the present invention has proposed an epoxy resin composition impregnated tube for unreinforced top / drain pipe reinforcement of Korean Patent Laid-Open Publication No. 10-2008-0007198 (published on Jan. 17, 2008) (Hereinafter referred to as " Prior Art 2 ").

In the prior art 2, when a tube is formed by impregnating an epoxy resin composition into a nonwoven fabric having a film on one side thereof for repairing and reinforcing the inner surface of the unrefined top and drain pipes, the epoxy resin composition is mixed with bisphenol-F and epichlorohydrin 70 to 80 (% by weight) of an epoxy resin as a reaction product of drin; 20 to 30% (by weight) of a phenol novolac resin prepared from an alkylated phenol and formaldehyde, and an epoxy resin composition infiltration tube for unreacted phase / drainage pipe reinforcement used as an aliphatic modified amine type curing agent.

In the prior art 2, as compared with the prior art 1, the shrinkage of the tube due to curing during installation is small, the adhesion to the inner surface of the sewer pipe is improved, the peeling of the tube from the inner surface of the sewer pipe is prevented, There is no odor when it is environmentally friendly. Further, since the physical properties of the cured product are improved, even if exposed to sunlight for a long time, the cured product is not easily cured, and air pollution and the generation of VOC, which is a carcinogen, are prevented as much as possible.

Korean Utility Model Registration No. 20-0352875 (2004. 06. 14. Announcement) 'Epoxy resin composition impregnated tube for upper / sewer pipe reinforcement' Korean Unexamined Patent Publication No. 10-2008-0007198 (published on Jan. 17, 2008) 'Epoxy resin composition impregnated tube for unscrewed phase / sewer pipe reinforcement'

However, in the case of construction of the old building, it is common that the weather is forced to be applied even in the very cold winter, and the existing epoxy composition for reinforcing the upper and the sewer pipes used for the tube impregnation of the prior arts 1 and 2 has a considerable degree of softness Since the thermosetting resin is a falling thermosetting resin, when the liner is cured by applying heat at a temperature of 100 ° C or more and then cooled, when the weather is cold, the impregnation tube shrinks considerably and the extrusion of the impregnated tube and the inner surface of the repair tube occurs in many places, As a result, there is a problem in that the reinforcement of the deteriorated tube is lowered after the construction.

SUMMARY OF THE INVENTION The present invention has been developed to solve the problems of the prior art described above, and an object of the present invention is to provide a resin composition which is excellent in softness when a liner impregnated with an epoxy resin composition is completely cured, The present invention also provides a soft epoxy resin composition for repairing unreacted phases and sewage pipes, which can satisfactorily obtain a result of installation because the detachment phenomenon can be minimized.

The above object of the present invention is achieved by an epoxy resin composition for repairing irrigation / sewage pipes comprising a liquid epoxy resin main part and an aliphatic modified amine type hardener part, wherein the liquid epoxy resin main part comprises bisphenol-A mixed with phenol and acetone, 50 to 60 (% by weight) of a liquid epoxy resin as a reaction product of an alkaline salt synthesized from caustic soda and epichlorohydrin synthesized from propylene; Polypropylene glycol diglycidyl ether modified 40 to 50% by weight; And a defoamer added thereto 0.5 to 1 (% by weight); Wherein the aliphatic modified amine type curing agent portion comprises 90 to 95% by weight of an aliphatic modified amine type curing agent; 5 to 10 (% by weight) of a curing reaction promoter; And 0.5 to 1% by weight of a defoamer to be added thereto, and mixing the liquid epoxy resin main part and the aliphatic modified amine type curing agent part at a weight ratio of 100 to 20.

Since the epoxy resin composition of the present invention has good softness when the epoxy resin composition is applied for repairing cracks in the upper and the sewer pipes, it is possible to minimize the shrinkage phenomenon in the process of heating and curing the epoxy resin composition, There is an effect that the lifting phenomenon with the inner surface of the tube can be ideally prevented.

In addition, since the epoxy resin composition of the present invention does not have any harmful harmful substance components and does not affect taste and smell at all, it can be said that it is very suitable for repairing sewage and sewage pipes. Especially, It is possible to obtain a satisfactory repair and installation result because it is excellent in adhesion and adhesion to the inner surface.

1 is a process diagram for producing a liquid epoxy resin main part of the present invention
2 is a process diagram for producing the aliphatic modified amine type curing agent part of the present invention

Best Mode for Carrying Out the Invention Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a process diagram for producing a liquid epoxy resin main part of the present invention, and FIG. 2 is a process diagram for producing an aliphatic modified amine type curing agent part of the present invention.

As shown in the drawings, the unexpanded epoxy resin composition for non-digestion and sewage reinforcement of the present invention is composed of a main portion of a liquid epoxy resin and a portion of an aliphatic modified amine type curing agent, And an aliphatic modified amine type tackifier are mixed with a certain ratio (for example, a mixing ratio of 100 to 20) and made of a liquid epoxy resin for impregnating a repair tube.

As shown in Fig. 1, the softened liquid epoxy resin main part is composed of a liquid epoxy resin which is a reaction product of bisphenol-A prepared by mixing phenol and acetone with epichlorohydrin synthesized from propylene (BP-A type epoxy resin) (11,500 to 13,500 cps at 25 캜); Polypropylene glycol diglycidyl ether modified product (2000 to 4000 cps at 25 ° C) (hereinafter referred to as 'polypropylene glycol diglycidyl ether modifide synthesis product') and a product produced in the mixing process The antifoaming agent added for removing bubbles is put into a manufacturing vessel and mixed by stirring with a motor for a predetermined period of time to complete the manufacture.

The aliphatic modified amine type curing agent part may include an aliphatic amines-modified hardener in a production vessel as shown in FIG. 2; A curing reaction promoter; When the defoamer is added and reacted for 2 hours, it is completed. Then, it can be wrapped in a certain unit for the distribution transaction.

The reaction formula for bisphenol-A mixed with phenol and acetone and epichlorohydrine synthesized from propylene to form the liquid epoxy resin main part is as shown in the following reaction formulas 1 and 2 .

Scheme 1

Scheme 2

A liquid epoxy resin (BP-A type epoxy resin), which is a reaction product of bisphenol-A and epichlorohydrine, is an alkaline salt made of bisphenol-A and caustic soda Epichlorohydrin is added dropwise and heated. The reaction formula is shown in the following reaction formula (3).

Scheme 3

In the present invention, the proportions of the components constituting the liquid epoxy resin main part and the curing agent part are as follows.

The main part of the liquid epoxy resin is composed of 50 to 60% by weight of a liquid epoxy resin (BP-A type epoxy resin) which is a reaction product of bisphenol-A and epichlorohydrine and polypropylene glycol diglycidyl ether It is preferable to use 0.5 to 1 (by weight)% by weight of the antifoaming agent for removing the bubbles formed during the mixing process, Do.

If the mixing amount of the liquid epoxy resin is less than 50% by weight, the curing reaction rate becomes too slow. If the mixing amount is more than 60% by weight, the viscosity of the main part becomes too high and the impregnation workability becomes poor.

If the amount of the polypropylene glycol diglycidyl ether modified product used is less than 40% by weight, the softness of the cured product may deteriorate, so that excessive shrinkage may occur in various places during the cooling process in cold weather. (% By weight), the curing reaction rate is slowed and the working time becomes too long.

The curing agent is preferably mixed with 90 to 95% by weight of an aliphatic modified amine type curing agent in an amount of 5 to 10% by weight of a curing reaction promoter. In order to remove bubbles generated during mixing, 0.5 to 1% (% By weight) of the antifoaming agent.

That is, when the amount of the aliphatic modified amine type curing agent is less than 90% by weight, the curing time during mixing of the curing agent and the curing agent becomes too short. When the amount of the aliphatic modified amine type curing agent is more than 95% by weight,

If the amount of the curing reaction promoter is less than 5% by weight, the curing reaction slows down. When the amount exceeds 10% by weight, the curing time is too short when the curing agent is mixed with the curing agent.

The ratios of the components of the liquid epoxy resin main part and the curing agent part of the present invention are shown in Table 1 below.

The proportion of the constituent components of the main part and the hardener part
Item
Product Name
Ratio (% by weight)


Topic section

The reaction product of bisphenol-A and epichlorohydrin
50 to 60
Synthesis of polypropylene glycol diglycidyl ether modified
40 to 50
Small foam
0.5 to 1


Hardener part
Aliphatic modified amine type curing agent
90 ~ 95
Reaction promoter
5 to 10
Small foam
0.5 to 1

Of the constituents in the above Table 1, the mixing ratio of the liquid epoxy resin main part and the curing agent part is increased or decreased according to the seasonal temperature difference as shown in the following [Table 2] and [Table 3] And in this case, a more excellent cured product can be obtained.

In this case, when the weight of the liquid epoxy resin main part and the curing agent part is generally '100', the weight of the curing agent part is preferably mixed at a ratio of '20'. When such a mixture is mixed, No by-products are produced, which is very environmentally friendly.

[Table 2] below shows the viscosity and the application according to the season, which vary depending on the mixing ratio of the liquid epoxy resin (BP-A type resin) constituting the liquid epoxy resin main part and the polypropylene glycol diglycidyl ether modifier composite .

Viscosity change according to mixing ratio of the main part
Category \ Item
BP-A type resin
(weight%)
Synthesis of polypropylene glycol diglycidyl ether modified
(weight%)
Viscosity
(cps at < RTI ID =
Usage
One
60
40
5,000 ~ 6,000
For the summer season, spring and autumn
2
55
45
4,500-5,500
Spring, autumn, winter
3
50
50
4,000 ~ 5,000
Winter season

[Table 3] below shows the viscosity and the application according to the season depending on the mixing ratio of the aliphatic modified amine type curing agent and the curing reaction accelerator which are components of the curing agent part.

Viscosity change according to mixing ratio of hardener part
Category \ Item
Aliphatic modified amine type curing agent (% by weight)
Curing reaction accelerator
(weight%)
Viscosity
(cps at < RTI ID =
Usage
One
94 ~ 95
5 to 6
500 to 700
For the summer season
2
92 ~ 93
7 to 8
500 to 700
Spring and autumn
3
90 ~ 91
9-10
500 to 700
Winter season

Hereinafter, examples for obtaining the unreinforced epoxy resin composition for repairing the untreated water of the present invention within the mixing range of [Table 2] and [Table 3] will be described as an example.

≪ Example 1 >

60% by weight of a BP-A type liquid epoxy resin which is a reaction product of bisphenol-A and epichlorohydrine and 40% by weight of a polypropylene glycol diglycidyl ether modified product A constituent liquid epoxy resin main body; The epoxy resin composition for repairing unshredged upper and lower water pipes of the present invention is completed by mixing the curing agent part mixed in the aliphatic modified amine type curing agent 92 (% by weight) and the curing reaction promoter 8 (% by weight) at a ratio of 100 to 20 .

In order to obtain a high-quality cured product with the epoxy resin composition as described above, the cured product is cured for 3 hours or more while maintaining the temperature at 100 ° C, and then post-cured at room temperature for 1 hour or more.

Physical property measurement results of a resin containing 40% (by weight) of a polypropylene glycol diglycidyl ether modified product of the liquid epoxy resin main part in Example 1 and a curing agent containing a curing reaction accelerator 8 (weight) $ in the curing agent part The values are shown in [Table 4] below.

Physical property measurement result
Test Items
unit
Results
Test Methods



Liquid phase


Viscosity
mpa.s
2,000
KSM 3550 - 7: 2013
importance
g / cm3
1.12
KSM 3550 - 7: 2013
Housework time
Time (h)
28
KSM 3550 - 7: 2013
Volatile matter
%
1.3
KSM 3550 - 7: 2013


Hardening
Mold
The tensile strength
N / mm < 2 &
19.1
KSM 3006 - 2003
Flexural strength
N / mm < 2 &
9.38
KSM 3015 - 2003
Flexural modulus
N / mm < 2 &
310
KSM 3015 - 2003
Elongation rate
%
45
KSM 3006 - 2003
Absorption rate
%
0.04
KSM 3550 - 7: 2013

(The test analysis of [Table 4] was carried out by the Korea Research Foundation for Chemical Fusion Test)

A resin containing 40% (by weight) of a polypropylene glycol diglycidyl ether modified product of the liquid epoxy resin main part in Example 1 and a curing agent 8 (weight) of the curing agent part in a resin containing CIPP (Cured in place The results of the water quality tests of pipes (CIPP) are shown in [Table 5].

Results for CIPP water quality test
Test Items
unit
Results
Test Methods
Turbidity
NTU
0.02 or less
KSD8502: 2009
Chromaticity
Degree
0.1 or less
〃
Potassium Consumption
mg / L
0.3
〃
Residual chlorine loss
mg / L
0.0
〃
smell
-
clear
〃
flavor
-
clear
〃
draft
mg / L
Not detected
〃
Phenols
mg / L
Not detected
〃
Epichlorohydrin
mg / L
Not detected
〃
Clunendiisocyanate
mg / L
Not detected
〃

(The test analysis of [Table 5] was carried out by the Korea Research Foundation for Chemical Fusion Test)

As described above, according to the four seasons in which the temperature changes significantly, the mixing ratio of the liquid epoxy resin main part and the curing agent part in the constituent components can be increased or decreased to be suitable for use in the summer season, spring season and winter season, An epoxy resin composition for sewage pipe maintenance can be provided.

Therefore, according to the seasons of the repair of the cracked sewage and sewage pipes, or by using the best epoxy resin composition suitable for the type of pipe, type of construction site, and the choice of the heating method, workability is improved and satisfactory construction results are obtained .

In addition, the epoxy resin composition for repairing the upper and the drain pipes provided as described above can be said to be highly suitable for repairing the upper and the sewer pipes because no harmful substance harmful to the human body is detected and does not affect the taste or smell at all, It is very excellent in adhesion and adhesiveness to the inner surface of the maintenance pipe, so that it is possible to perform good repairing work.

Claims (4)

In constituting the epoxy resin composition for unreacted phase and drainage pipe maintenance by the liquid epoxy resin main part and the aliphatic modified amine type hardener,
The liquid epoxy resin base part
50 to 60 (% by weight) of a liquid epoxy resin as a reaction product of epichlorohydrin synthesized from propylene with an alkali salt synthesized from bisphenol-A and caustic soda mixed with phenol and acetone; Polypropylene glycol diglycidyl ether modified 40 to 50 (by weight)%; And a defoamer added thereto 0.5 to 1 (% by weight); Respectively,
The aliphatic modified amine type curing agent part
90 to 95% (by weight) of an aliphatic modified amine type curing agent; 5 to 10 (% by weight) of a curing reaction promoter; And 0.5 to 1 (% by weight) of a defoaming agent added thereto,
Wherein the liquid epoxy resin main part and the aliphatic modified amine type curing agent part are mixed in a weight ratio of 100 to 20 by weight. delete delete delete

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