JPH0787664B2 - Quick-acting waterproof material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is mainly arranged between a pipe of a conduit opening in a manhole in which facilities such as a communication cable and a power cable are provided, and a cable and the like so that the gap can be quickly removed. The present invention relates to a quick-acting waterproof material that can stop water.

[Conventional technology]

Generally, communication cables, power cables, etc. are installed in underground pipes buried underground. The ends of these underground pipes are open to the manhole, and water or the like leaks from between the pipe and the cable in the manhole portion. To prevent such a situation from occurring,
Conventionally, a urethane prepolymer containing a terminal isocyanate group (solution form) is put in the void as it is, and the gap is covered with a cloth or the like to prevent the prepolymer from being washed away and react with leakage water to foam, expand, cure, and stop water. Is being done. When water is stopped in this way, the urethane prepolymer foams and hardens to exhibit great strength and adhesion to the conduit, and exhibits an excellent water-stopping action.

[Problems to be solved by the invention]

However, the above-mentioned urethane isocyanate prepolymer containing a terminal isocyanate group (hereinafter abbreviated as "urethane prepolymer")
When using as a water-stopping material, it is necessary to directly fill it in the gap between the cable and the pipe through the conduit opening. In this case, in order to prevent the strong toxicity of the isocyanate group and the like, it is necessary to work while paying attention to the prevention of adhesion of the skin, eyes, clothes, etc., and the work becomes complicated. In addition, since toxic gas is generated, there is a problem from the viewpoint of health and safety. Moreover, the urethane prepolymer is in the form of a solution and it takes time to fill it, and it is necessary to prevent the urethane prepolymer from being washed away in the pipeline until the start of the reaction.
In particular, when the water leakage is severe, the urethane prepolymer is washed out, and there is a big problem that the water cannot be stopped.

The present invention has been made in view of such circumstances, and is a quick-acting waterproof material that can be easily stopped, does not cause a problem in safety and hygiene, and can stop water even under severe water leakage. The purpose is to provide.

[Means for solving problems]

In order to achieve the above object, the quick-acting water blocking material of the present invention has a container configured to be destroyed when the internal pressure exceeds a predetermined value, and is divided into two chambers by an easily removable separating material. The terminal isocyanate group-containing urethane prepolymer is filled or sealed as it is or in a state in which it is impregnated in the impregnating base material, and the other chamber is filled and sealed with the curing agent for the urethane prepolymer.

That is, since the above-mentioned quick-acting waterproof material contains the urethane prepolymer in the container, the urethane prepolymer does not adhere to the skin, eyes, or clothes during the waterproof operation. Moreover, at the time of its use, the separator is removed, the urethane prepolymer and the curing agent are mixed in a container made of a water-soluble polymer material, foamed to some extent, and then the container is filled in a water-stopping portion. As a result, the bag is broken by the foaming pressure, and the foaming and hardening is completed at the water blocking location. Therefore, even in a severe water leak location, the chemical solution does not flow out and the water can be stopped quickly. In addition, simplification of water stoppage work can be realized. Moreover, since no toxic gas is generated, safety and health problems do not occur.

The quick-acting waterproofing material of the present invention comprises a container configured to be destroyed when the internal pressure exceeds a predetermined value, a separating material which divides the interior into two chambers, a urethane prepolymer, and, in some cases, the above-mentioned urethane. An impregnating base material for impregnating a prepolymer,
It is obtained using a curing agent.

The material of the container is not particularly limited.
A synthetic resin or a metal foil may be used as long as the urethane prepolymer and the curing agent react with each other and the container shape can be maintained until foaming occurs to some extent. Alternatively, a laminated product of both may be used. Further, in the case of a synthetic resin, it may or may not be water-soluble. Examples of water-soluble materials include polyvinyl alcohol (PVA), hydroxyethyl cellulose, carboxymethyl cellulose, and fibrin sodium glycolate. The shape of the container is not particularly limited, but a film pack (bag-like material) is preferable. In some cases, the container shape may be formed into a hollow columnar shape that surrounds the periphery of a communication cable or the like. Further, it may be formed in a double bag shape.

The separator for dividing the inside of the container into two chambers is not particularly limited. When the container is manufactured, it may be a partition wall integrally formed of the same material as the container, or in the case of a bag-shaped container, it may be a clip or the like which divides the bag into two parts sandwiching the central part of the bag. . When the container is a double bag container, the inner bag serves as a separator. The inner bag or the partition wall is provided with cuts, streaks or the like so as to be easily broken.

The urethane prepolymer to be filled and sealed in the container is not particularly limited, and any urethane prepolymer that reacts with the curing agent described below and foams and expands and cures can be used. However, it is preferable that the reaction is quick. As such, for example, a urethane obtained by reacting a polyalkylene oxide containing 20 to 60 wt% of a primary alkylene oxide in the molecule by random copolymerization of a primary alkylene oxide and a secondary alkylene oxide, and an organic isocyanate. Examples include prepolymers. If necessary, conventionally known plasticizers, fillers and the like may be enclosed together with the urethane prepolymer.

The urethane prepolymer may be directly filled and sealed in one chamber in the container. However, from the viewpoint of reinforcing effect and the like, it is preferable that the urethane prepolymer is filled and sealed in the container while being impregnated in the impregnating base material. The impregnating base material is made of a material that does not react with the isocyanate group of the urethane prepolymer, nor interfere with the reaction of the urethane prepolymer with water or the foaming. Examples of the fibrous material include cotton-like aggregates of glass fibers, carbon fibers, metal fibers, polyolefin fibers, and other fibers that are inactive to isocyanate. Examples of the sponge material include urethane sponge material and vinyl chloride sponge body.

The curing agent filled in the other chamber of the container is not particularly limited, and a conventionally known curing agent that reacts with the urethane prepolymer is used. Water is also a curing agent,
It is prized for its low cost.

The quick-acting water blocking material of the present invention can be manufactured using the above-mentioned raw materials, for example, as follows. That is, a bag made of a polymeric material is prepared in advance, which is divided into two chambers by a partition wall, and one of the chambers is filled with the urethane prepolymer as it is or by impregnating it with the above-mentioned impregnating base material, and the opening is melted by heat. It can be manufactured by sealing, or partially dissolving with water, and then sealing by joining and sealing, and then filling the other chamber with a curing agent and sealing in the same manner.

Next, the present invention will be described based on examples.

〔Example〕

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a polyolefin plastic bag whose inside is divided into two chambers by a partition wall 1a, and one chamber is provided with polyalkylene oxide (primary alkylene oxide 50).
%) And a tolylene diisocyanate reaction product (containing 5% of isocyanate groups), which is filled and sealed. Then, the other chamber contains water (liquid B) as a curing agent. In addition, a plurality of streaks are formed along the longitudinal direction of the bag 1 in the inner partition wall 1a so that the inner partition wall 1a is easily broken.

When using the water blocking material, hold the plastic bag 1 by hand, crush the inner partition wall 1a by rubbing, etc., mix the A liquid and the B liquid as shown in FIG. 2, and proceed the reaction to some extent. Let it foam. Next, in that state, the water-stop portion is filled. As a result, the bag 1 is ruptured by the foaming pressure, the reaction proceeds to some extent, and the water blocking point is quickly closed by the foamed and hardened reaction product,
In that state, the reaction proceeds further and the strong water stop is completed.

FIG. 3 shows another embodiment. In this embodiment, the inside of the bag 1 is divided into two chambers by sandwiching a central portion of a bag (without a partition wall) 1 of the same material as the bag 1 of the above embodiment with a clamp 2.
Liquid A and liquid B similar to the above are individually filled in each chamber. In this embodiment, the clamp 2 is removed to mix both liquids A and B.

FIG. 4 shows still another embodiment. That is, in this embodiment, a double bag made of the same material as that of the above embodiment is used, and the same liquid A as the above is filled and sealed in the inner bag 3 and the liquid B is filled and sealed in the outer bag 4. In this case, the inner bag 3 is formed thin, and is broken by the pressure of the liquid B by strongly rubbing the outer bag 4, whereby the liquids A and B are mixed.

〔The invention's effect〕

The quick-acting waterproof material of the present invention removes the isolating material, mixes the urethane prepolymer and the curing agent in the container, foams them to some extent, and then fills the container with the waterproof part to destroy the bag by foaming pressure. , The urethane prepolymer foam curing is completed at the water stop location. Therefore, even in a severe water leak location, the chemical solution does not flow out and the water can be stopped quickly. Further, since the urethane prepolymer and the curing agent are mixed and used in the container, both are uniformly mixed,
As a result, uniform foaming and hardening can be obtained, the strength of the reaction product is improved, and strong water blocking can be achieved. It can also be used when there is no water at the water stop. In addition, simplification of water stoppage work can be realized. Further, since no toxic gas is generated, safety and health problems do not occur.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a use explanatory diagram thereof, FIG. 3 is a block diagram of another embodiment, and FIG. 4 is a block diagram of still another embodiment. 1 ... bag, 1a ... partition wall, A ... urethane prepolymer, B ... water

Claims (2)

[Claims] 1. A container constructed so as to be destroyed when the internal pressure exceeds a predetermined value is divided into two chambers by an easily removable separator, and one of the chambers contains a terminal isocyanate group-containing urethane prepolymer as it is. A quick-acting waterproof material obtained by filling and sealing an impregnated base material in an impregnated state, and filling and sealing the other chamber with the curing agent for the urethane prepolymer. 2. The quick-acting waterproof material according to claim 1, wherein the impregnating base material is a fiber material or a sponge material.