JPS5984969A - 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 flaky 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- 300pts.wt. of a flaky filler (preferably organic substance such as paper, polyester, rayon, vinylon, nylon, etc.) having a thickness of several microns and a length of 50-700mu 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. When the filler is an organic material, its amount is preferably 15-60pts.wt. 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 a press-fit sealing material for repairing leaks in pipes, which is used by press-fitting into leaking parts of pipes.

Pipes such as gas piping and water piping are laid for the purpose of transporting contents such as gas and water, and the contents are usually conveyed under pressure. Piping usually consists of single pipes of limited length connected by flanges or joints. These flanges, joints, and other connecting parts are connected via sealing members such as backings to prevent leakage of the transported contents. Due to thinness, etc., the connection part will become strained.

Taking underground gas piping as an example, when converting from city gas to natural gas, highly dry natural gas is sent, which causes the rubber, yarn, and other backings of the 7 lunges and joints to dry out, causing blisters. . Furthermore, vibrations caused by traffic vehicles and the like are added, causing gas leakage from the connection. Gas leaks not only result in a loss of gas, but also pose a risk of explosion, which has a large social impact. Moreover, gas J hanging can occur not only at the connection part but also at the hole (corrosion hole) due to corrosion of the piping.

In order to prevent such loss of contents, disasters caused by leaked contents, environmental pollution, etc., it is necessary to repair the leaking portion of the piping. In the old days, the repair method used was to replace the leaking part of the pipe with a new one, but this required a large-scale construction work that took several minutes and was expensive, especially when the pipe was buried underground. This has become difficult due to deteriorating traffic conditions in urban areas.

Therefore, various methods have been developed to regenerate leaking existing pipes in their original state. These can be roughly classified as follows.

Method 2) Insertion method 3) Joint repair method Among the above methods, the resin lining method (resin coating method and resin There are two methods: spraying is the method) and joint repair method (the sealing is pasted on the inside of the shrine is the repair ring resin press-in method).

Methods for repairing leaks by press-fitting a sealant into a container include a pig pressure-feeding method and a repair ring resin press-fitting method among resin coating methods.

A repair method using a press-in sole will be explained below using figures, taking as an example a leak repair lining of a joint using a pig pressure feeding method. In Fig. 1, pipes 1 and 2 are connected by a joint 3, and the joint 3 is made of rubber.

Sole material filled with organic materials such as yarn or metal materials such as lead 4
It is sole. As a result of long-term use of piping, leakage occurs from the joint 3 due to loosening of the joint 3 or thinning of the filler seal 4 as described above. In order to repair or prevent these problems, a sealing material (in particular, the lining paulownia is used) is applied between the two pigs 5 and 5' in order to selectively line the joint part or to line all the piping. Load it with a suitable material and set the pressure P (usually 0.3 to 0.
To 5! i'/cl) to form a lining coating film 7 on the inner surface of the pipe, and at the same time, sealing material is press-fitted into the leaking part of the filled sole material 4.

Next, FIG. 2 shows a state in which the rear pig 5 has passed through the joint part to be repaired or prevented. A pressure P is applied to the formed lining coating film 7 as well as the sealing material 8 which is press-fitted and sealed. If the sealing material has poor air pressure resistance, a through hole (air path) is formed in the press-fitted sealing material by the pressurized air, resulting in insufficient leakage sealing performance.

After the lining process is completed, and after a predetermined time for inspection and curing of the lining coating, a conveying pressure P' is applied as shown in FIG. Normally, the gas conveyance pressure P' is P'(P (P'ξichi"') compared to the pig pressure conveyance pressure P', so if there is no air path in the sealant during the lining process, leak sealing performance can be ensured. - As can be seen from the second example below, in the method of repairing leaks in piping by press-fitting a sealant, the press-fit sealant has sufficient sealing properties to withstand the pig pressure after being sealed. Conventionally, room temperature curing epoxy resins have been used as press-fit sealants for these applications.
Urethane resin.

Silicone resins, unsaturated polyester resins, etc. have been used, but they do not exhibit absolute leak sealing properties, and are only effective when the leakage rate is extremely small (0,577 J/sec), or when the leakage rate is Δ111 However, since the actual pipe silk leakage rate is about 50 mA/sec at the maximum, it is impractical and has only limited applicability.

This is done by improving the technology by examining two methods and repairing methods (pig and repair ring), and lining materials and sealing materials whose properties and characteristics match the usage conditions of the construction method and components. This is because there was a strong view that the government should procure items that were In other words, as a press-fit sealant, characteristics related to the workability of the press-fit sole, such as viscosity and pot life, are emphasized from the perspective of compatibility with the construction method, and the functions of the press-fit sealant are actively used to exhibit leak-sealing properties. It wasn't something. Therefore, the technical level of the above-mentioned construction methods and components has been the limit for lining and sealing using the construction methods.

Therefore, the inventors developed a room-temperature-curing press-fit sealing material that can be applied to leaking parts of piping to actively perform leak-sealing functions. By including it in a specific proportion,
It was discovered that very good results could be obtained using the leakage sole properties described in Section 2, which led to the creation of this invention.

That is, the present invention provides a room-temperature-curing press-fit sealing material applied to a leaking part of piping, in which a flake-like filler is added to the press-fit sealing pad in a total amount of the room-temperature-curing resin and its curing agent. 5-3 for heavy blockage
This invention relates to a press-fit sealing material for repairing pipe leakage, characterized in that it contains 0.00 parts by weight.

Flakes used in the press-fit sealing material of this invention
The filler has a scale shape (thickness of about several μm and length of about 50 μm).
Inorganic materials such as glass flakes, graphite flakes, mica flakes, silica flakes, calcium silicate flakes, talc flakes, kaolin flakes, etc.
Organic materials such as paper, polyester, rayon, vinylon, nylon, etc., as well as copper, brass, iron, aluminum, and tin.

Metal materials such as zinc are mainly used. Among these, it is particularly preferable to use organic materials with light specific gravity. If necessary, in addition to these scaly fillers, silica in shapes other than flakes, clay, tar, calcium carbonate, asbestos, acids (1, iron, etc.) may be added.

Known fillers such as aluminum and copper may also be used in combination.

Epoxy resin is a typical example of the cold-setting resin used in the press-fitting agent of the present invention. Examples of curing agents for curing epoxy resins at room temperature include polyamide amines, polyamides, aromatic amines, polyalkylene polyamines, amine-modified adducts, ketimines, 7'-amine-containing adducts, separated adducts, imitazole, and guanidine.

Other room temperature curable resins include resins such as polyether polyols and polyester polyols that become urethane resins when cured (crosslinked), and incyanate compounds are used as curing agents (crosslinking agents). resin, unsaturated polyester resin, acrylic resin,
Phenolic resin.

Room temperature curing resins such as xylene resins and furan resins can be used, and in order to cure these resins at room temperature, appropriate curing agents are used.

If necessary, various thermoplastic resins that are compatible with these resins, such as polyester resin, ethylene-vinyl acetate copolymer, thiocol resin, ionomer resin, modified butadiene-acrylonitrile + 1 resin, vinyl acetate resin, coal tar, etc. Coal, petroleum residue resin, etc. such as asphalt pitch are used together.

The press-fit sealing material of this invention contains dibutyl phthalate, 1
・Known non-reactive diluents such as dioctyl phthalate, furfuryl alcohol, ethanol, ・methanol,
Known additives such as fluidity regulators and silane coupling agents are added as necessary.

The proportion of the scaly filler in the press-fit sealing material having such a composition is 5 to 300 parts by weight based on 100 parts by weight of the total amount of the room temperature curing resin and its curing agent, preferably an inorganic material. 15 to 60 parts by weight [1 part for organic materials, 10 to 50 parts by weight for organic materials, 40 parts by weight for metallic materials]
~180 parts by weight. It has been found that by setting the proportion of the scale-like filler within this range, good results can be obtained in both press-fit sealing workability and press-fit sealability.

On the other hand, if the ratio is less than 5 parts by weight, the press-fit sealing performance will be impaired, and if it exceeds 300 parts by weight, the press-fit sealing workability will be impaired.

In the correlation between press-fit sealing workability and press-fit sealability, the viscosity of the press-fit sealant is the main factor. For example, in a lining construction method using the pig pressure feeding method, if the pumping pressure is constant, the higher the viscosity, the longer the pumping time will be. Table 1 shows the relationship between viscosity and pumping speed when loaded between pigs and pumped at a pressure of 0.5 KV/cJ.

On the surface, at a pressure of about 0.5 K9/crR, 1,000
Practical viscosity is below poise. Of course, if the pressure is increased, it is possible to pump to a high viscosity, but there is a limit due to the negative effects of high pressure (for example, leakage from areas where no leakage has occurred).Furthermore, if the viscosity is too low, The press-fit sealing performance is poor (such as sagging phenomenon occurs after lining and press-fit sealing), and it is not suitable for the purpose.

Based on the above, the viscosity of the normal press-fit sealant is 3.
A practical range is about 00 to 1,000 poise.

The reason why the use of such a filler is effective in sealing against leaks is because, as shown in FIG. 5, leaking parts of the piping easily become clogged during press-fitting.

In other words, with conventional press-fit sealants that use granular fillers, as shown in Figure 4, the granular fillers in the sealant gather in clusters 9 during press-fitting, and the gaps between the clusters near the leaking part of the pipe. A channel 1o of the resin is formed between the filler particles and the resin channel 1o is unable to resist the pumping pressure, creating an air path leading to the leakage portion 12 of the filling sealing material 1 such as yarn.

On the other hand, when using a scaly filler, as shown in Fig. 5, the fillers 13 come into three-dimensional contact with each other during press-fitting, and a continuous 1° channel of resin is not formed at the leaking part of the pipe. Easily clogs and can resist pumping pressure.

As described above, the press-fit sealing material of the present invention has significantly lower sealing properties than conventional press-fit sealants due to clogging of the scale-like filler during press-fitting.

Therefore, the sealing material of the present invention is essentially not affected by the type of resin used in terms of leak sealing properties. However, thermoplastic resins lack practicality, such as being susceptible to deformation due to the conveying pressure of the pipe contents and poor adhesion to the pipes. On the other hand, the room-temperature curing resin used in the sealing material of the present invention is practically effective since it does not have the above-mentioned drawbacks.

The press-fit sealing material of this invention is a construction method in which the inner surface of the pipe is lined or sealed by force-feeding a paint pig with the press-fit sealant, and a construction method in which the press-fit sealant is press-fitted into the joint from the outside surface of the pipe using a repair ring or the like. It is also used in a construction method in which a tube pre-molded inside the piping is expanded and the pressure is used to bond the tube and the piping using a press-fit sealant.

Examples of this invention will be described below. In the following, the term "part" indicates the double positive part.

Example 1 80 parts of Epicor 1-#s2s (epoxy resin manufactured by Yuka Shell Epoxy Co., Ltd.), Slζ-'1''1)G(
20 parts of epoxy resin (manufactured by Nariki Pharmaceutical Co., Ltd.), 20 parts of Hytron (granular curcum, manufactured by Takehara Chemical Industry Co., Ltd.) ″3!-O parts, C
CJ”-150 (Glass flakes manufactured by Nippon Sheet Glass Co., Ltd.) 4
0 parts and 2 parts of Aerosil #380 (fine powder silica manufactured by Nippon Aerosil Co., Ltd.) were mixed in a plantary mixer at room temperature to prepare an epoxy resin blend system.

Next, 100 parts of Sanmide 076 (polyamide amine manufactured by Sanso Kagaku Co., Ltd.), 30 parts of Hytron (mentioned above), and CCF
25 parts of -150 (mentioned above), CCF-048 (05 parts of glass flakes manufactured by Nippon Sheet Glass Co., Ltd.).

Aerosil #380 (92 parts as above) was mixed in a Plankley mixer at room temperature to prepare a curing agent compounding system.

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 Epoxy resin compounded TENO F lath flake CC of Example 1
F, 150 (excluding 40 copies), PE-0
3 (scaly, ll! Riester manufactured by Keiyo Textile Industry Co., Ltd.) 2
5 parts were added and mixed at room temperature using a planter 1 no-mixer to prepare an epoxy resin blend system.

Next, the curing agent compounded Tenof Lasflake CCF of Example 1 was prepared.
-150 (above), 5 parts of CCF-048 (from niJ) were removed, and PE-03 (above, 925 parts) were mixed in a Brantley mixer at room temperature to form a curing agent compounding system. Prepared.

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

Example 3 Glass flakes CCF-1 using the epoxy resin system of Example 1
50 (mentioned above) and 70 parts of +10100l (scaly aluminum manufactured by Toyo Aluminum Co., Ltd.) were mixed in a planter 1 no-mixer at room temperature to prepare an epoxy resin blending system.

Next, crow flakes CCF-
A curing agent blend system was prepared by mixing 70 parts of 11001M (mentioned above) at room temperature using a Brantley mixer, excluding 25 parts of 150 (mentioned above) and 5 parts of CCF-048 (mentioned above). .

The above-mentioned epoxy resin compound system and curing agent compound system were used in a weight ratio of 2:1 to obtain a press-fit sealing chalet of the present invention.

The epoxy resin system of Example 1 except for 40 parts of glass flakes C△ CF-150 (mentioned above) was mixed with 40 parts of No. 6 silica sand (silica sand manufactured by Maruo Calcium Co., Ltd.) in a Brantary mixer at room temperature. Mixing was performed to prepare an epoxy resin mixed system.

Next, using the curing agent combination system of Example 1, glass flakes CCI"
-150 (above) 25 parts and CCF-048 (above) 5 parts except for No. 6 silica sand (above) 40 parts were mixed in a Brantley mixer at room temperature to form a curing agent compounding system. was prepared.

The epoxy resin compounding system and the curing agent compounding system described in 1.
A press-fit sealing material was prepared by using a ratio of 2:1.

Except for 40 parts of CF-150 (mentioned above), 940 parts of S talc (granular talc manufactured by Shokuryaku Kogyo Co., Ltd.) was mixed at room temperature using a Brantley mixer to prepare an epoxy resin blended system.

Next, glass flakes CCF-
150 (supra) 25 copies and c c F-04s (supra) (
A curing agent compounding system was prepared by adding 40 parts of S talc (described above) and mixing the remaining 5 parts with a Brantley mixer at room temperature.

A press-fit sealing material was prepared by using the epoxy resin compounding system and the curing agent compounding system described in ``1'' at a weight ratio of 2:1.

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

In Fig. 6, single pipes 14, ], 4 for gas piping with an inner diameter of 50 mm and a length of 150 mm are connected to a socket 15 at 1f=jQ, and one end of the single pipe 14' is connected to a blank camp 1.
V rMI at 6. Single pipe 14 connected with socket 15
, 14' are notched in two places in the longitudinal direction as shown in FIGS. 7(A) and 7(B), and a leakage portion is intentionally created by filling the notched portions with yarn 18.

Further, one end of the single pipe 14 connects a connecting camp 17.

To adjust the tightening of the socket 15, approximately 3
Ensure that the leakage rate is 0 leakage/second.

Once the leakage has been set, as shown in Figure 8, remove the connection cap 17, insert the spherical pig 20 into the bottom circle and apply the press-fit sealing material 19, which is a mixture of an epoxy resin compound and a curing agent compound. Test the Nobu socket connection below.
After filling to the height of L and connecting the connection cap 17,
．． 5 Apply K7/ca air pressure (1') for about 1 minute,
Press fit sealant into the leaking area. When the press-fitting is completed, remove the connection cap 17 as shown in Figure 9, and
It is molded to a constant film thickness 21 using eight polyethylene spherical pigs 20. After the coating film is formed, connect cap 1 as shown in Figure 10.
7 again and set the air pressure to 0.5 K9/crR (
P) for 1 hour, then apply soap and water to check if air leaks from the leaking part.

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

◯ indicates that the sealing property is good, and × indicates that the sealing property is poor.

As is clear from Table 2, the press-fit sealing hole of the present invention has sufficient leak sealing properties and is extremely practical for repairing pipe leaks.

[Brief explanation of the drawing]

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 a conventional press-fit sealing material is press-fitted into the repaired part of the pipe. Cross-sectional view, Figure 5 shows the state in which the press-fit sealing hole of the present invention is press-fitted into the repaired part of the pipe - an enlarged cross-sectional view of the main part, Figure 6 is a cross-section of the dess 1 pipe used for the test of sealability Figure 7 (A) shows a single pipe 14 for gas piping,
14' is a side view of the threaded portion, FIG. 7 (13) is a front view of the threaded portion, and FIGS. 8 to 10 are cross-sectional views of a test pipe for explaining the leakage sole test method. Patent Applicant Nitto Electric Industry Co., Ltd. Agent Patent Attorney Moto Kunio Negi Figure 20 517 Figure 4 Figure 5 [6 Figure 7 Figure 8 Ward Figure 10 Figure 90

Claims (2)

[Claims] (1) In a cold-curing press-fit sealing material applied to a leaking part of piping, the flake-like filler is added to 100 parts by weight of the cold-curing resin and its curing agent contained in the press-fitting sealant. 5 to 300 parts by weight of a press-fit sealing material for repairing piping. (2) The press-fit sealing material for repairing piping leaks according to claim (1), wherein the flake-like filler is made of an organic substance.