JPS5984970A - Forcing sealing material for repairing leak of piping - Google Patents

Abstract

PURPOSE:To provide the titled sealing material having excellent forcing sealing workability and remarkably improved performance to repair the leak of piping, by adding a specific amount of light filler to a forcing sealing material based on the sum of the cold-curing agent and a curing agent contained in the material. CONSTITUTION:The objective sealing material is obtained by adding 5- 100pts.wt. (preferably 15-60pts.wt.) of a light filler having a particle density of <=1.0g/cm<2> and particle diameter of <=800mu (preferably hollow particles or foamed article of silica, hollow particles or foamed article of polypropylene, nylon, etc., polyethylene, etc.) to a forcing sealing material based on 100pts.wt. of the sum of the cold-curing resin such as epoxy resin and a curing agent such as polyamideamine, etc. contained in the sealing material. The viscosity of the forcing sealing material is preferably 300-1,000 poise for practical viewpoint. USE:Sealing of gas pipings and water pipings.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the use of a press-fit seal for repairing leaks in pipes, which is used by press-fitting into leaky parts of pipes.

1. Piping such as gas piping or water piping is laid for the purpose of transporting contents such as gas or water, and the contents are usually conveyed under pressure. Piping is usually a single unit with a limited length. The pipes are connected by flanges and joints.These flanges and joints are connected via sealing members such as backings to prevent flooding and leakage of the transported contents. After years of use, the connections may become corroded or loosened, and the backing may leak due to thinning or casting.

For example, in the case of buried gas piping, the conversion from city gas to natural gas results in highly dry natural gas being sent, which causes the backings of flanges and joints, such as combs and yarns, to dry out and cause thinning. In addition, vibrations caused by traffic vehicles and the like are added, causing gas to swell from the connection. gas δ
1) This not only results in the loss of debris, but also the danger of explosions, which has a large social impact.Also,
Gas leakage is caused not only by connections but also by holes (j) caused by corrosion in the piping.
It can also occur in areas with N pits.

In order to prevent such loss of contents, disaster occurrence, environmental pollution, etc. due to lost contents, it is necessary to repair the i2W damaged portion of the piping. The old method of repair was to replace the leaking part of the pipe with a new pipe.
1141 This would be a large-scale construction project in terms of time and expense, and the construction of C4 piping would have to be carried out by burying pipes in the lees (7), which became difficult to implement due to deteriorating traffic conditions in urban areas. It has become.

Therefore, various methods have been devised and implemented to regenerate leaking multi-stage pipes in their original state. These can be broadly classified into one type as shown below.

2) Insertion method 3) Joint repair method - Of the methods described above, the resin lining method (resin coating method and resin There are two methods: the spraying method) and the joint repair method (the method for applying sealant on the inside surface and the repair ring resin press-in method).

Among these methods, methods for repairing leaking parts by press-fitting a sealing material include a resin coating method, a long pig pressure-feeding method, and a repair ring resin press-fitting method.

A repair method using a press-fit seal will be described below with reference to the drawings, taking as an example a leak repair lining of a joint using the pig pressure feeding method. In FIG. 1, a pipe 1 and a shingle 2 are connected through a joint 3, and the joint 3 is sealed with a sealing material 4 filled with an organic material such as a comb or yarn, or a metal material such as lead. Due to long-term use of the piping, as mentioned above, if the joint 3 becomes loose or the filler sealing material 4 becomes thinner, leakage occurs from the joint 3.

In order to repair or prevent these problems, either selectively line the joint f or line the entire pipe with a sealant (here, we especially use the term lining) between the two pigs 5 and 5'. Fill the pipe with a lining coating film 7 on the inner surface of the pipe, and press-fit the sealing material into the hanging part of the filling seal 4. Seal.

Next, in Figure S2, the rear pig 5 is shown passing through the joint part to be prevented, and the pumping pressure P is applied to the formed lining coating 7 and the sealing material 8 press-fitted. If the sealing material has poor air pressure, a through hole (air path) will be created by the pressurized air in the press-fitted sealing phase, resulting in insufficient leak sealing performance. After the lining process is completed, and after a predetermined period of time for inspection and curing of the lining coating, a conveying pressure P is applied as shown in FIG.

Since P (P", = ↓P), during the lining process °]0 If an air path is created in the sealing material and 11, leak sealing performance can be ensured.

As can be seen from the above examples, in the method of repairing leaks in piping by press-fitting sealing material, the press-fitting sealing material is required to have sufficient sealing performance to reduce the pig pumping pressure after being sealed. . Conventionally, room temperature curing epoxy resins and urethane resins have been used as press-fit sealing materials for these applications.

Silicone resins, unsaturated polyester resins, etc. have been used, but they do not provide absolute leak sealing properties, and are effective only when the number of melons that give up is extremely small (0.5η + J/sec), or the amount of leakage is limited. It only has the effect of reducing
In reality, the maximum leakage rate of pipe joints is about 50 m1/sec, so it is impractical and has only limited applicability.

In the above-mentioned construction method, the technical direction is determined solely by examining the construction method and components (pigs and repair rings).The lining materials and sealing materials are examined based on their properties and characteristics, and the usage conditions of the construction method and components. In other words, as a press-fit sealant, Hl:+ properties related to press-fit seal workability such as viscosity and 1+f usage time were considered to be suitable for the construction method. The emphasis was placed on this, and the leakage sealing performance was not actively achieved through the function of the press-fit sealant.Therefore, the technical level of the construction method and components was the limit for lining and sealing using that construction method.

Therefore, the inventors conducted a thorough investigation on a cold-curing press-fit sealing material that can be applied to the deflection part of the distribution and actively exert the function of deflection sealing. -1, we found that by including a specific filler in a specific proportion in the press-fit sealing material, very good results can be obtained in the above-mentioned lnf sealing properties, which led to the creation of this invention. be.

In other words, the present invention provides a method for treating leakage parts of piping.
In the 111'i+1 hardening type press-fit sealing hole, a light filler with a particle size of 800μ or less with a particle density of LO ¥/ca or more is combined with the regular WA curable resin contained in the above-mentioned sealant and its curing agent. This relates to a press-fit sealing material for repairing piping, characterized in that the total amount of 100 parts includes 5 to 100 parts by weight.

Light fillers used in the press-fit sealing material of this invention include inorganic hollow bodies and foams such as silica, glass, and alumina, and organic fillers such as polypropylene, polystyrene, nylon, phenolic resin, and vinylidene chloride-acrylonitrile copolymer. Among hollow bodies, foam bodies, hollow bodies and foam bodies made of light metal such as aluminum, the particle density is 1.
09/cj or less with a particle size of 800μ or less, and abrasive materials such as polyethylene with a density of 1.0g10+
Among the organic fillers having a particle size of 7 or less, those having a particle size of 800μ or less are included. In addition to these light fillers, if necessary, light fillers J, Silino J having other properties,
Known fillers such as clay, talc, lucium carbonate, asbestos, iron oxide, iron, aluminum, copper, etc. can also be used.

VF human sealing agent of this invention.
K7! As the curable resin u', epoxy (Ro・1
Fat is a typical example. Curing agents that cure epoxy resins at room temperature include polyamide amines, polyamides, aromatic amines, polyalkylene polyamines,
These include amine acid attack, ketimine, amine intra/door attack, minute 1 attack, imitazole, and quanidine.

Other room temperature curable resins include resins such as polyether polyols and polyester polyols that become urethane resins when cured (crosslinked), and examples of curing agents (crosslinking agents) include isocyanate compounds. In addition, other silicone J7i, 1 fat, unsaturated 11 polyester resin, acrylic resin, phenol +;r, + fat.

It is possible to use the usual 111111j hardening type) h.
In order to harden the resin, an appropriate hardening agent is used.

Also, if necessary, various thermoplastic resins that are compatible with these resins, such as polyester resins, ethylene-vinyl acetate copolymers, and thiocol resins.

Ionomer resins, modified butadiene-acrylonitrile resins, vinyl acetate resins, and coal-stone surface residue resins such as coal tar and asphalt pitch are used in combination.

The press-fit sealing material of this invention includes the following fillers.

In addition to the room temperature curing resin and its curing agent, known additives such as dibutyl phthalate, dioctyl phthalate, furfuryl alcohol, ethanol, methanol, and other known non-reactive diluents, fluidity regulators, and silane coupling agents are required. It is blended accordingly.

The proportion of the light filler in the press-fit sealing material having such a composition is 5 to 100 parts by weight, preferably 15 to 100 parts by weight, per 100 parts by weight of the room-temperature curing resin and its curing agent. 60 parts by weight, and it has been found that by setting within this range, good results can be obtained in both press-fit sealing workability and press-fit sealability. In contrast, ``1
If the proportion is less than 5 parts by weight, the press-fit sealing performance will be impaired, and if it exceeds 100 parts by weight, the press-fit sealing workability will be impaired.

In the correlation between press-fit seal workability and press-fit sealability, the viscosity of the press-fit seal IN is the main factor. For example, in a lining method using a pig pressure feeding method, the pumping time becomes longer as the viscosity increases, even if the pumping pressure is constant.

The example is 1. Table 1 shows the relationship between viscosity and pumping speed when the initial lining filling length is 5771 mm and the inner diameter of the OOM is 5771. It becomes like this.

Table 1 As shown in Table 1, the pressure is 0.5 K from the viewpoint of press-fit seal workability! i'/ctN], 000 poise or less is a practical viscosity. Of course, it is possible to pump high viscosity by increasing the pumping pressure, but there is a limit because high pressure causes problems (for example, leakage occurs from areas where singing is not occurring). Furthermore, if the viscosity is too low, the press-fit sealability will be poor, such as sagging phenomenon occurring after lining or press-fit sealing, which is not suitable for the purpose.

Based on the above, the viscosity of the press-fit sealing hole is usually 3.
00-1. ．． 000 poise is a practical range.

In this invention, the particle density in the press-fit sealing hole is 1.0.
By using a light filler with a particle size of 800μ or less under g/C poly, excellent leak sealing properties can be obtained.
This is because, as shown in FIG. 5, no air path is formed during press-fitting, and the filler easily clogs at the leaking part of the piping.

That is, in conventional press-fit sealing materials, as shown in FIG. 4, the filler gathers in clusters 9 during press-fitting, and resin channels 10 are formed between the clusters and filler particles.
is formed, and the air cannot resist the partial force and pressure, leading to the leakage portion 12 of the filling seal 11 of the rubber and yarn tongue, impairing the leak sealing performance.

On the other hand, in the press-fit sealing chamber of the present invention, the density of the light filler is adjusted to the resin density (usually 1.2 !i'/ca"-)
By setting it so that it does not become larger, when the sealant flows during press-fitting, the I1 agent exhibits the same flow behavior as the resin flow, so it is uniformly dispersed and resin channels are formed. jλ. Furthermore, in the flow direction, the arrival speed of the filler is fast, so the filler becomes clogged at the deflected portion, increasing the press-fitting resistance and being able to resist the pumping pressure.

If the particle size of the light filler is too large, the phase of the resin alone between the t\°f particles will become large, impairing leakage sealing properties, so the particle size is set to 800 μm or less, preferably 300 μm or less.

The press-fit sealing material of the present invention is a construction method in which the inner surface of the pipe is lined or sealed with a l-1-man-link ring by force-feeding a lining material, and a press-fit sealing phase is applied by using a repair ring or the like from the outer surface of the pipe at the joint part. It is used in a construction method in which a tube is press-fitted into a pipe, and in a construction method in which a tube pre-formed inside a pipe is expanded and the pressure is used to bond the tube and pipe together using a press-fit sealant.

Examples of this invention will be described below. In the following, parts refer to parts by weight.

Example 1 80 parts of Epicote #828 (epoxy resin manufactured by Yuka Shell Epoxy Co., Ltd.), 20 parts of 5ll-I-PG (epoxy resin manufactured by Itamoto Pharmaceutical Co., Ltd.), Hytron (granular talc manufactured by Takehara Chemical Industry Co., Ltd.) 30 parts, Flowene UF-20 (fine powder polyethylene manufactured by Tetsu Kagaku Co., Ltd.; particle density 0.92!F
/cffl, maximum particle size 70 μ) 40 parts, Aerosil #380 (fine powder silica manufactured by IE Hon Aerosil)
One part was mixed at room temperature using a Planta IJ mixer to prepare an epoxy resin blending system.

Next, 100 parts of Sanmide #76T (polyamide amine manufactured by Sansho Kagaku Co., Ltd.), 30 parts of Hytron (mentioned above), and 40 parts of Frocene Ul''-20 (mentioned above).

A curing agent compounding system was prepared by mixing 1 part of Aerosil #380 (mentioned above) at room temperature using a Plankley mixer.

The press-fit sealing material of the present invention was prepared by using the above-mentioned epoxy resin compound system and curing agent compound system in a weight ratio of 2:1.

Example 2 Frocene (JF-
20 (mentioned above) except for 40 copies, Q-CI basket L 300 (
Silica hollow body made by Asahi Glass: particle density 0.219/cri
l.

An epoxy resin blending system was prepared by mixing 30 parts of 180 µm (maximum particle size) using a Plankley mixer using a JF meter.

Next, Frocene jJ F-2 was prepared using the curing agent combination system of Example 1.
0 (mentioned above) except for 40 copies, Q-CEL 3 Q Q (
A curing agent compounding system was prepared by mixing 30 parts of the above-mentioned compound in a Plankley mixer at room temperature.

The press-fit sealing material of the present invention was prepared by using the above-mentioned epoxy resin compound system and curing agent compound system in a weight ratio of 2:1.

Example 3 Frocene U1;-2 using the epoxy resin blending system of Example 1
Except for 40 copies (0C above), World Serahon No. 4 (
Foamed silica manufactured by Shikoku Kaken Kogyo; particle density approximately 0.44/C
An epoxy resin blend system was prepared by mixing 45 parts of waste (maximum particle size: 700 μm) using a Brantley mixer at room temperature.

Next, Frocene UF-20 was prepared using the curing agent combination system of Example 1.
A curing agent compounding system was prepared by removing 40 parts of World Cellvon No. 4 (mentioned above) and adding 45 parts of World Cellvon No. 4 (mentioned above) and mixing the mixture at room temperature with a Brantley mixer.

A press-fit sealing shrine of the present invention was prepared by using the epoxy resin compound system and the curing agent compound system described in -1- at a weight ratio of 2:1.

20 (mentioned above), 40 parts of No. 6 silica sand (silica sand manufactured by Maruo-H Lucium Co., Ltd.; particle density 2.79/cIII, maximum particle diameter approximately 300μ) was added to a regular trowel. Mixing is carried out using a Brantley mixer. A xylene resin blend system was prepared.

Next, Frocene (IF-2
A curing agent compounding system was prepared by mixing 40 parts of No. 6 silica sand (above) except for 40 parts of No.

The above-mentioned epoxy resin compound system and curing agent compound system were used in a weight ratio of 2:1 to form a press-fit seal link shrine.

20 (mentioned above) except for 40 parts, S talc (granular talc manufactured by Asa C Powder Nigyo Co., Ltd.; particle density I Fl', 2.7 'i
/ ca.

Maximum particle size: approx. 2511) Add 40 parts to 1
Mixing was performed using a Brantley mixer at 11N to prepare an epoxy resin blend system.

Next, in the curing agent combination system of Example 1, except for 40 parts of Frozen T-+ R knee 20 (mentioned above), 40 parts of S talc (mentioned above) was added.
A curing agent compounding system was prepared by mixing 0 parts of the curing agent at room temperature using a Brantley mixer.

A press-fit sealing paulownia was made by using the epoxy resin compounding system and the curing agent compounding system in a weight ratio of 2:1.

The leakage properties of the press-fit sealing material prepared as described above were confirmed by the following method.

In Figure 6, the inner diameter is 50 mm, and the length is 150 mm.
The single pipes 14 and 14' for gas piping are connected with a socket 15, and one end of the single pipe 14' is sealed with a blind cap 16.

The threaded portion of the single tube 14.14 that is connected to the socket 15 is intentionally leaked by making two notches in each vertical direction and filling the notches with yarn 18, as shown in Fig. 7 (A) and CB). make. Further, one end of the single g14 is connected to a connecting cap 17.

By adjusting the tightening of the socket 15, approximately 30
The leakage amount should be nJ/sec.

Once the amount of deflection has been set, as shown in Figure 8, remove the connection/tower 17, insert the spherical pig 20 into the bottom, and press-fit the sealing hole 19 in which the epoxy resin compound system and hardener compound system have been mixed in advance. After filling the socket connection part of the test pipe to a height of 2" and connecting the connection cap 17, 0.
Apply air pressure (P) of 5 Kg/cJ for about 1 minute and press-fit the press-fit sealing hole into the leaking part. When the press-fitting is completed, remove the connection cap 17 and remove the connection cap 48 as shown in Figure 9.
It is molded to a constant film thickness 21 using a polyethylene spherical pig 20 of ++a. After forming the coating film, as shown in Fig. 10, connect the connecting cap 17 again and heat it for 0.5 K? /ca air pressure (
1゛) for 1 hour, then check to see if air leaks from the folded part by adding soap and water.

The results of the leak seal test are shown in Table 2.

As is clear from Table 2, where ○ indicates good warp sealing performance and × indicates poor warpage sealing performance, the press-fit sealing material of the present invention has sufficient leakage sealing performance, and is suitable for use in repairing cracks with distribution δt11. It turns out to be extremely practical.

[Brief explanation of drawings]

Figures 1 to 3 are cross-sectional views illustrating the process of lining pipes for repairing leaks using the pig pressure feeding method, and Figure 4 is an enlarged view of the main part showing the state in which conventional press-fit sealing is press-fitted into the repaired part of the pipe. 5 is an enlarged sectional view of the main part showing the state in which the press-fit sealing product of the present invention is press-fitted into a repaired part of piping, and FIG. Figure 7 (A+ is a single pipe for gas piping 14, 14
FIG. 7 is a side view of the threaded part, Bl is a front view of the threaded part, and FIGS. 8 to 10 are cross-sectional views of a test pipe for explaining the leak sealing test method. Patent application Person Nitto Electric Industry Co., Ltd. No. 1 No. 2 Fig. → P' Fig. 4 1 No. 6 No. 7 Fig. 8 Fig. 1 o Day 9 Fig. 52

Claims (1)

[Claims] (1) In a cold-curing press-fit sealing hole applied to a leaking part of piping, the particle density is 1.0'i/crR.
PJ, below, a light filler with a particle size of 800μ or less is press-fitted in an amount of 5 to 100 parts by weight per 100 parts by weight of the room temperature curing resin and its curing agent contained in the sealing agent.
A 1-king sealing shrine for repairing piping leaks, which is characterized by including parts.