JP2018002942A - Aqueous emulsion and water stop construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aqueous emulsion and a water stop construction method using the same, where a water top material formed by mixing and curing the aqueous emulsion and an urethane prepolymer exhibits water stop effect quickly and provides long term stable water stop effect.SOLUTION: There is provided an aqueous emulsion having water, a resin solid component with a molecular structure having a hydroxyl group, and an anionic surfactant. There is provided a water stop construction method for water stopping a water stop target part by injecting the aqueous emulsion and a liquid urethane prepolymer to the water stop target part in a water stop target member. The aqueous emulsion contains no water-soluble polymer and hydroxyl group value of the resin solid component is in a range of 1 to 100.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an aqueous emulsion for forming a water-stopper and a water-stop method using the aqueous emulsion.

  Conventionally, a building frame made of a cement composition such as concrete is cracked due to drying shrinkage or aging deterioration, and water such as rainwater or groundwater may enter the building from the cracked portion. And in that case, the water stop construction which inject | pours a chemical | medical solution into water stop target parts, such as the said crack part, forms a water stop thing, and stops water leak is made.

  As this water stop construction method, there is a one-part water stop construction method in which one chemical solution is injected into a water stop target portion. For example, there are a method of injecting a urethane prepolymer as the chemical solution and a method of injecting an aqueous emulsion as the chemical solution.

  On the other hand, Patent Documents 1 and 2 include a urethane prepolymer and an aqueous emulsion as a construction method having both the immediate curability exhibited by the former urethane prepolymer injection method and the long-term durability exhibited by the latter aqueous emulsion injection method. Has been disclosed. And according to the said construction method, water required for the reaction for crosslinking and foaming the urethane prepolymer (FIG. 3C) is supplied from the aqueous emulsion, and the urethane prepolymer is crosslinked and cured in a relatively short time. On the other hand, since water is consumed in the water-based emulsion by this supply, the resin solids dispersed in the emulsion are also easily fused with each other, and the emulsion is cured in a relatively short time. Therefore, according to the two-component water-stop method, an immediately curable water-stopping material can be formed. In addition, the water-stopping material may exhibit higher long-term durability than the water-stopping material formed by a one-pack type urethane prepolymer injection method based on the chemical stability derived from the resin solid content of the aqueous emulsion. it can.

JP 2014-181486 A Patent 5300162

  However, neither of these two-part waterstop methods of Patent Documents 1 and 2 causes a chemical reaction (chemical change) between the resin solid content of the aqueous emulsion and the urethane prepolymer. Therefore, the water-stopping material that is cured and formed is a product in which the foamed urethane resin cured product and the resin solid cured product of the water-based emulsion are connected to each other only by intermolecular forces and are chemically bonded. Not integrated. Therefore, there is a problem that higher durability cannot be expected for such a water-stopping object, and as a result, it is impossible to cope with a case where a water-stopping effect that is more stable in the long term is required.

  In addition, when the aqueous emulsion is emulsified using a water-soluble polymer such as polyvinyl alcohol as in the two-component water-stop method of Patent Document 2, the water-soluble polymer that covers the resin solid content of the aqueous emulsion. However, there is a problem that the water-based emulsion is hard to be cured because the fusion of the resin solids is hindered. Furthermore, at the time of mixing the aqueous emulsion and the urethane prepolymer, the water-soluble polymer consumes the isocyanate group of the urethane prepolymer, thereby inhibiting the reaction between the urethane prepolymer and water. As a result, the biuret reaction or the like is suppressed, making it difficult for the urethane prepolymer to be cross-linked, resulting in a problem that the curing time of the urethane prepolymer or the like becomes long. And by these, in the water stop construction method of patent document 2, it is difficult to acquire the water stop effect rapidly.

  The present invention has been made in view of the conventional problems as described above. The purpose of the present invention is to provide a water-stopping product that is formed by curing by mixing an aqueous emulsion and a urethane prepolymer. It is to make it possible to obtain a stable water stop effect over a longer period of time.

The main invention for achieving the above object is:
An aqueous emulsion comprising water, a resin solid having a molecular structure having a hydroxyl group, and an anionic surfactant.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  According to the present invention, a water-stopping material formed by mixing an aqueous emulsion and a urethane prepolymer can quickly exhibit a water-stopping effect, and obtain a more stable water-stopping effect in the long term. Can do.

Drawing 1A thru / or Drawing 1D are explanatory views of a water stop construction method of this embodiment. It is a partially broken side view of the injection head 25 of the injection device 20 provided for the water stop method. 3A to 3C are explanatory diagrams of problems and the like when the first conventional aqueous emulsion E1 is used as the second chemical solution. 4A to 4C are explanatory diagrams of problems and the like when the aqueous emulsion E2 of the second conventional example is used as the second chemical solution. FIG. 5A to FIG. 5C are explanatory diagrams of operational effects and the like when the aqueous emulsion E3 of the present embodiment is used. It is Table 1 which shows the specification of the material which used for the chemical-resistance test of a durability test. It is Table 2 which shows the kind of chemical | medical agent used for the chemical-resistant test. It is a graph of the tensile strength which is a tensile test result. It is a graph of the elongation rate at the time of a fracture which is a tensile test result. It is Table 3 which shows the temperature conditions, etc. of a heat test and a water resistance test. It is a graph of the tensile strength which is a tensile test result. It is a graph of the elongation rate at the time of a fracture which is a tensile test result. It is Table 4 which shows the specification and test result of water-based emulsion E3, E4 which used for the test which confirms that sclerosis | hardenability falls when the water-based emulsion E3 of this embodiment contains PVA.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
An aqueous emulsion comprising water, a resin solid having a molecular structure having a hydroxyl group, and an anionic surfactant.

  According to such an aqueous emulsion, when mixed with the urethane prepolymer, the isocyanate group of the urethane prepolymer and the hydroxyl group of the resin solid content of the aqueous emulsion are chemically directly bonded and integrated based on a chemical reaction. A cured product that is difficult to decompose is formed. Therefore, based on this hardened | cured material, a water stop thing can show | form high durability in a long term.

Moreover, emulsification of said aqueous emulsion is made | formed with the anionic surfactant. Therefore, the use of a water-soluble polymer such as polyvinyl alcohol for emulsification can be suppressed, thereby making it easier to avoid problems that may occur when emulsifying with the water-soluble polymer.
For example, it can be suppressed that the isocyanate group of the urethane prepolymer to react with the hydroxyl group of the resin solid content due to the reaction of the isocyanate group of the urethane prepolymer with the hydroxyl group of the water-soluble polymer, As a result, the hardened material that is difficult to decompose can be reliably formed in a relatively short time. Moreover, it can suppress that water-soluble polymer inhibits the fusion | melting of resin solid content of aqueous emulsion, As a result, hardening of resin solid content can be performed in a comparatively short time. Furthermore, the water-soluble polymer can be prevented from interfering with the reaction between the urethane prepolymer and water, whereby the urethane prepolymer is crosslinked in a relatively short time to form a cured polyurethane resin. be able to. And by the above, a water stop thing can show | play a water stop effect rapidly.

Such an aqueous emulsion comprising:
It is desirable that the weight average molecular weight of the resin solid content is greater than 1000 and less than or equal to 2000000.

  According to such an aqueous emulsion, since the weight average molecular weight of the resin solid content is larger than 1000, a more stable cured product can be formed as a water-stopping material based on the resin solid content.

  It is desirable that such an aqueous emulsion does not contain a water-soluble polymer.

According to such an aqueous emulsion, the isocyanate group of the urethane prepolymer to be reacted with the hydroxyl group of the resin solid content is reduced due to the reaction of the isocyanate group of the urethane prepolymer with the hydroxyl group of the water-soluble polymer. Can be prevented. This makes it possible to form the hardened material that is difficult to decompose in a relatively short time.
Moreover, it can prevent also about the water-soluble polymer inhibiting the fusion | melting of resin solid content of aqueous | water-based emulsion, As a result, hardening of resin solid content can be performed in a comparatively short time.
Furthermore, the water-soluble polymer can also prevent the reaction between the urethane prepolymer and water, thereby allowing the urethane prepolymer to crosslink in a relatively short time and form a cured polyurethane resin. It can be formed.

  In such an aqueous emulsion, the hydroxyl value of the resin solid content is preferably in the range of 1 to 100.

  According to such an aqueous emulsion, the resin solid content has a relatively large number of hydroxyl groups. Therefore, the hydroxyl group of the resin solid content can be quickly and directly bonded and integrated with the isocyanate group of the urethane prepolymer, thereby reliably forming a cured product that is difficult to decompose. .

  The water stop is characterized in that the water stop target part is stopped by injecting the water-based emulsion according to any of the above and a liquid urethane prepolymer into the water stop target part of the water stop target member. It is a construction method.

  According to this water stop construction method, the water-based emulsion and the urethane prepolymer are injected into the water stop target portion. Therefore, the same operation effect as the above-described operation effect can be achieved, and thereby, the water stop target portion can be quickly stopped and the water stop effect can be maintained over a long period of time. it can.

  In such a water stop method, it is desirable that the water-based emulsion and the liquid urethane prepolymer are blended so that the weight ratio is in the range of 100: 21 to 100: 100.

  According to this water stop construction method, the above-described operational effects can be reliably achieved.

=== This Embodiment ===
Drawing 1A thru / or Drawing 1D are explanatory views of a water stop construction method of this embodiment. Moreover, FIG. 2 is a partially broken side view of the injection head 25 of the injection device 20 provided for the water stop method.
This water stop construction method fills the cracked portion 1pw by injecting a chemical into the cracked portion 1pw, which is a water stop target portion, in the concrete structure 1 as a water stop target member. In addition, in this example, although the crack part 1pw is illustrated as the water stop target part 1pw, it is not restricted to this at all. That is, any part having a gap that may cause water leakage can be a water-stop target part. For example, a jointed portion of concrete may be used as the water-stop target part 1pw.

  As shown in FIG. 1A, in this water stop method, first, an injection device 20 is carried in and arranged in the vicinity of the concrete structure 1. The injection device 20 is a two-liquid mixing type device. That is, the two tanks 22u and 22e storing different kinds of chemical liquids, the pumps 23u and 23e provided for the tanks 22u and 22e, and the chemical liquids from the pumps 23u and 23e via the high-pressure hoses 24u and 24e, respectively. And an injection head 25 as an injection device 25 to which is pumped. One tank 22u stores a liquid urethane prepolymer as a first chemical liquid, and the other tank 22e stores an aqueous emulsion as a second chemical liquid. The urethane prepolymer and the aqueous emulsion are separately pumped and supplied to the injection head 25 by the corresponding pumps 23u and 23e, and mixed in the flow path SP25c (FIG. 2) in the head 25. The ink is ejected from the ejection port 25h of the head 25 in a mixed state.

  Specifically, as shown in FIG. 2, the injection head 25 includes a bifurcated base portion 25a, a base side cylinder portion 25b provided integrally with the base portion 25a, and an appropriate pipe joint 25j on the base side cylinder portion 25b. A distal end side cylinder portion 25c provided substantially coaxially and detachably. The base portion 25a is provided with two flow paths R25au and R25ae, and the corresponding high pressure hoses 24u and 24e out of the two high pressure hoses 24u and 24e are connected to the flow paths R25au and R25ae, respectively. ing. Further, these two flow paths R25au and R25ae merge at a predetermined position in the base portion 25a to form one flow path R25a1, and the one flow path R25a1 is connected to the in-cylinder flow path SP25b of the base side cylinder portion 25b. It is connected. Further, the in-cylinder flow path SP25b is connected to the in-cylinder flow path SP25c of the distal end side cylinder portion 25c built in the mixer 26. Therefore, the urethane prepolymer and the aqueous emulsion pumped from the tanks 22u and 22e merge in the base portion 25a in the injection head 25, and pass through the distal end side cylindrical portion 25c via the base side cylindrical portion 25b. The urethane prepolymer and the aqueous emulsion are agitated and mixed by the substantially spiral mixer 26. And it discharges from the discharge outlet 25h of the front end side cylinder part 25c in the said mixed state.

  On the other hand, as shown in FIG. 1A, the injection hole 1h is connected to the cracked portion 1pw so as to be connected to the cracked portion 1pw in parallel with or before and after the carrying-in / placement operation of the injection device 20. Perforate. A plurality of such injection holes 1h are formed, for example, formed side by side at a formation pitch of 200 mm or the like in each of the horizontal direction and the vertical direction.

  Then, as shown in FIG. 1B, the front end side cylinder part 25c of the injection head 25 is inserted into the injection hole 1h, and the respective pumps 23u and 23e are activated, and the urethane prepolymer is discharged from the discharge port 25h of the front end side cylinder part 25c. And a mixture of the aqueous emulsion are discharged, and the mixture is injected into the cracked portion 1 pw. The injected mixture is cured in a relatively short time. That is, the water necessary for the foam curing of the urethane prepolymer is supplied from the aqueous emulsion. On the other hand, the water is consumed from the aqueous emulsion by this supply, and the aqueous emulsion is cured. Therefore, basically, not only the urethane prepolymer is foamed and cured in a relatively short time, but also the aqueous emulsion is cured in a relatively short time.

  When the injection is completed, the pumps 23u and 23e are stopped, or the discharge from the discharge port 25h is stopped by closing the flow paths R25au and R25ae in the injection head 25 with a valve (not shown). Then, as shown in FIG. 1C, the distal end side cylinder portion 25c of the injection head 25 is removed from the injection hole 1h. If it does so, it will transfer to the uninjected injection hole 1h (not shown in FIG. 1A thru | or FIG. 1D) located in the horizontal direction or the vertical direction of this injection hole 1h, and the above-mentioned injection | pouring operation | work with respect to the said injection hole 1h repeat. Further, as shown in FIG. 1D, the injected injection hole 1h is filled with an appropriate filler Z1 such as mortar so as to have no hole.

  Here, as an example of the liquid urethane prepolymer which is the first chemical liquid, a delayed curing type urethane resin can be exemplified. The delayed-curing urethane resin is a curing time of 30 minutes or more at room temperature (20 ° C.) when the urethane resin is added at a concentration of 10% by weight with respect to the total weight of the urethane resin and tap water. Is. However, it is not limited to this. That is, a urethane resin other than the delayed curing type may be used.

  On the other hand, the following two types have been conventionally used as the aqueous emulsion as the second chemical solution. That is, the aqueous emulsion E1 of the first conventional example is obtained by emulsifying an acrylic resin having a molecular structure having no hydroxyl group as the resin solid content J1 in water W with an anionic or nonionic surfactant K1. In addition, the aqueous emulsion E2 of the second conventional example is prepared by using an acrylic resin and a petroleum resin having a molecular structure having no hydroxyl group as the resin solid content J2 in water with polyvinyl alcohol (hereinafter also referred to as PVA) as a surfactant. Emulsified in W.

  However, each of the aqueous emulsions E1 and E2 of the first conventional example and the second conventional example has a problem that it is difficult for the cured water-stopping materials SB1 and SB2 to obtain a stable water-stopping effect for a longer period of time, and the water-stopping effect. It is difficult to obtain quickly. 3A to 3C and FIGS. 4A to 4C are explanatory diagrams of the problems.

First, as shown in the left figure of FIG. 3A, the aqueous emulsion E1 of the first conventional example is composed of water W as a dispersion medium and a resin solid content of a molecular structure having no hydroxyl group such as an acrylic resin (FIG. 3B). J1 and an anionic or nonionic surfactant K1. Examples of anionic surfactants include sulfonates such as R—SO ₃ Na and carboxylates such as R—COONa, and examples of nonionic surfactants include polyoxyethylene alkyl ethers. Can be illustrated.

  Then, as shown in FIG. 3A, when the aqueous emulsion E1 and the urethane prepolymer UPP are mixed, the water W supplied from the aqueous emulsion E1 reacts with the urethane prepolymer UPP as described above (FIG. 3C), Then, the urethane prepolymer UPP is crosslinked and foamed and cured. As a result, as shown in the right diagram of FIG. 3A, a polyurethane resin cured product KPU is formed as a cured product of the crosslinked polymer. Moreover, about water-based emulsion E1, since water W is consumed by supply of water W to said urethane prepolymer UPP, resin solid content J1, J1, such as an acrylic resin disperse | distributed in the water-based emulsion E1, is mutually. It fuse | melts and hardens | cures, and the hardened | cured material KJ1 of resin solid content J1 is formed by this (refer the right figure of FIG. 3A).

  However, in this case, since the urethane prepolymer UPP and the resin solid content J1 are not chemically reacted, they are not chemically bonded and integrated, that is, the cured products KJ1 and KPU that are separately formed are simply mixed. It is only in the state. Therefore, as shown in the right diagram of FIG. 3A, there is a large interface BS1 between the cured product KPU of polyurethane resin and the cured product KJ1 of resin solid content J1. However, the interface BS1 has low strength because it only works. Therefore, higher durability cannot be expected for the still water SB1 having such a large interface BS1, and as a result, a long-term stable water stop effect cannot be expected.

  On the other hand, as shown in the left figure of FIG. 4A, the aqueous emulsion E2 of the second conventional example is composed of water W as a dispersion medium and an acrylic resin (for example, acrylic resin) as a resin solid content J2 having a molecular structure not having a hydroxyl group. Acid butyl ester) and petroleum resin, and PVA (FIG. 4B) as a surfactant. And also when this water-based emulsion E2 and urethane prepolymer UPP are mixed, the urethane prepolymer UPP is foam-cured by reaction with water W or the like (FIG. 3C) as in the case of the first conventional example, As a result, the urethane prepolymer UPP is crosslinked to form a polyurethane resin cured product KPU alone, and also in the aqueous emulsion E2, the resin solids J2 and J2 are fused to each other and cured. As a result, a cured product KJ2 having a resin solid content J2 alone is formed (see the right diagram in FIG. 4A). Therefore, also in this case, the cured products KPU and KJ2 formed separately are merely in a mixed state. Therefore, as shown in the right diagram of FIG. 4A, the cured product KPU of polyurethane resin and the resin A large interface BS2 exists between the solid content J2 and the cured product KJ2, and as a result, higher durability cannot be expected for the water-stopped product SB2.

  Further, in the case of this second conventional example, as shown in the left diagram of FIG. 4A, the aqueous emulsion E2 is emulsified based on the hydroxyl group (hydroxyl group, OH group) of PVA covering the outer periphery of the resin solid content J2. However, since there exists a hydroxyl group in PVA, as shown in FIG. 4C, the hydroxyl group reacts with the isocyanate group of the urethane prepolymer UPP, and as a result, reacts with water W ( FIG. 3C) Urethane prepolymer UPP to be reduced. Therefore, in this case, the urethane prepolymer UPP is difficult to be cross-linked, and thereby the molecular weight of the cured polyurethane resin KPU formed by curing is reduced. And as a result, it becomes difficult for the water stop thing SB2 which consists of this hardened | cured material KJ2, KPU to show | play the stable water stop effect. 4A, since the resin solid content J2 of the aqueous emulsion E2 is covered with PVA, the PVA hinders the fusion between the resin solid content J2 and J2, and the As a result, the aqueous emulsion E2 becomes difficult to harden and the hardening time becomes longer, which makes it difficult to quickly obtain a water stop effect.

  Therefore, in the present embodiment, an aqueous emulsion E3 having the following composition is used. That is, as shown in the left figure of FIG. 5A, this aqueous emulsion E3 has a resin solid content J3 having a molecular structure (molecular formula) having water W as a dispersion medium and a hydroxyl group (hydroxyl group, OH group) at the molecular end. (FIG. 5B) and an anionic surfactant K3.

  According to the aqueous emulsion E3 having such a composition, when mixed with the urethane prepolymer UPP, the isocyanate group of the urethane prepolymer UPP and the resin solid content J3 of the aqueous emulsion E3 are based on a chemical reaction as shown in FIG. 5C. The hydroxyl group is directly bonded and integrated with a chemical group, thereby forming a hardened material KJ3PU which is difficult to decompose. Therefore, based on this hardened | cured material KJ3PU, the water stop thing SB3 of the right figure of FIG. 5A can show high durability in a long term. Further, since most of the urethane prepolymer UPP and the resin solid content J3 are consumed in the above reaction, the amount of the polyurethane resin cured product KPU formed individually by the reaction with water W (FIG. 3C) is the same as that in FIG. As shown in the right figure of Fig. 5A, the amount of the cured product KJ3 of the resin solid content J3 individually formed by fusing the resin solid contents J3 and J3 of the aqueous emulsion E3 is also the right of Fig. 5A. As shown in the figure, it decreases. Therefore, the size of these interfaces BS3 is also reduced, and this also contributes to the improvement of the durability of the water-stopping material SB3.

Further, as shown in the left diagram of FIG. 5A, this aqueous emulsion E3 is emulsified with an anionic surfactant K3. Therefore, the use of a water-soluble polymer such as PVA for emulsification can be suppressed, and in this example, no water-soluble polymer is used. That is, the aqueous emulsion E3 does not contain a water-soluble polymer such as PVA.
Therefore, the isocyanate group of the urethane prepolymer UPP to be reacted with the hydroxyl group of the resin solid content J3 is reduced due to the reaction of the isocyanate group of the urethane prepolymer UPP with the hydroxyl group of a water-soluble polymer such as PVA. The problem can be prevented. As a result, the hardened KJ3PU that is difficult to decompose can be reliably and relatively formed in a relatively short time when mixed with the urethane prepolymer UPP. Moreover, it can prevent also about the problem which the said water-soluble polymer inhibits fusion | melting of resin solid content J3 of J3 of aqueous emulsion E3, As a result, hardening of resin solid content J3 is also performed in a comparatively short time. be able to. Furthermore, the problem that the water-soluble polymer hinders the reaction between the urethane prepolymer UPP and water W can also be prevented, whereby the urethane prepolymer UPP is crosslinked in a relatively short time, and the polyurethane resin A cured product KPU can be formed. And as a result, the water stop of the crack part 1pw can be performed rapidly.

  In addition, as the resin solid content J3 having a molecular structure having a hydroxyl group, an acrylic resin having a molecular structure having a hydroxyl group as shown in FIG. 5B can be exemplified, and this is used here. However, the resin solid content J3 having a molecular structure having a hydroxyl group is not limited thereto. For example, acrylic ester, styrene acrylic ester, ethylene vinyl acetate, polypropionic ester, polypropylene, polyethylene, polyester, styrene butadiene rubber (SBR), chloroprene rubber (CR), natural rubber It may be a resin solid component composed of (NR) system or the like.

  Desirably, the weight average molecular weight of the resin solid content J3 is preferably larger than 1000, and more desirably 100,000 or more. And if it does in this way, based on this resin solid content J3, it will become possible to form more stable hardened | cured material KJ3PU, KJ3. Further, from the viewpoint of smoothly performing a polymerization reaction as a crosslinking reaction, the weight average molecular weight of the resin solid content J3 is preferably set to 2000000 or less, and desirably set to 150,000,000 or less.

  Furthermore, the hydroxyl value of the resin solid content J3 is in the range of 1 to 100, preferably in the range of 20 to 80. And if it is such a range, the resin solid content J3 has a comparatively many hydroxyl group. Therefore, the hydroxyl group of the resin solid content J3 can be quickly and directly bonded and integrated with the isocyanate group of the urethane prepolymer UPP, thereby reliably forming a hardened material KJ3PU that is difficult to decompose. .

  Moreover, about the compounding ratio of the water-based emulsion E3 and urethane prepolymer UPP at the time of mixing, it selects from the range of 100: 21-100: 100 by weight ratio, for example.

  FIG. 6 thru | or FIG. 9 is explanatory drawing of the durability test of the water stop thing SB3 hardened and formed by mixing the water-based emulsion E3 and urethane prepolymer UPP of this embodiment. Here, as a comparative example, a durability test of a water-stopping material SB1 formed by mixing the water-based emulsion E1 of the first conventional example and the urethane prepolymer UPP is also performed. Table 1 in FIG. 6 shows the specifications of the materials used for the test.

  First, the aqueous emulsions E3 and E1 of this embodiment and the first conventional example shown in Table 1 of FIG. 6 were prepared, and a urethane resin was prepared as a urethane prepolymer UPP. Each of the aqueous emulsions E3 and E1 of this embodiment and the first conventional example is mixed with a urethane resin at a mixing ratio (weight ratio) of 1.5: 1, thereby producing a 1 mm thick cured body. did. Then, after curing each cured body for 14 days, a test piece is punched out from each cured body with a dumbbell-shaped No. 3 die, and then each test piece is made into one of the chemicals in Table 2 of FIG. It was immersed for 91 days. And each test piece was taken out from the chemical | medical agent on the day before a tension test, and after drying overnight in the normal temperature air environment, the tension test was done with respect to each test piece at the tension speed of 500 mm / min. In addition, the chemicals in Table 2 were selected on the assumption of the usage environment to which the still water is exposed.

  8 and 9 show the tensile test results. FIG. 8 is a graph of tensile strength, and FIG. 9 is a graph of elongation at break. 8 and 9, the upper bar graph is the tensile test result of the test piece of the aqueous emulsion E3 of the present embodiment, and the lower bar graph is the test of the aqueous emulsion E1 of the first conventional example. It is a tensile test result of a piece.

  Referring to FIG. 8, for any chemical, the tensile strength of the test piece of the aqueous emulsion E3 of the present embodiment is higher than the tensile strength of the test piece of the aqueous emulsion E1 of the first conventional example. ing. Moreover, when FIG. 9 is seen, also about the elongation rate (%) at the time of a fracture | rupture, the direction of the test piece of the water-based emulsion E3 of this embodiment is higher than the test piece of the water-based emulsion E1 of a 1st prior art example. Therefore, it was confirmed that the waterstop SB3 cured and formed using the aqueous emulsion E3 of the present embodiment exhibits high durability even in the assumed use environment.

  Here, the durability test is performed not only from the viewpoint of chemical resistance but also from the viewpoint of heat resistance and water resistance. Details are as follows.

  First, similarly to the above-described chemical resistance test, 1 mm thick cured bodies were respectively prepared by mixing each of the aqueous emulsions E3 and E1 of Table 1 in FIG. 6 and the first conventional example with a urethane resin. . Each cured body was cured for 14 days, and a test piece was punched from each cured body with a dumbbell-shaped No. 3 die.

  If it does so, each test piece will be under the environment shown in Table 3 of FIG. It was left still for 91 days. Then, each test piece was taken out from the above environment on the day before the tensile test and dried overnight in a room temperature air atmosphere, and then a tensile test was performed on each test piece at a tensile speed of 500 mm / min. The conditions in Table 3 were set assuming a use environment where the still water is exposed.

  11 and 12 show the tensile test results. FIG. 11 is a graph of tensile strength, and FIG. 12 is a graph of elongation (%) at break. In both graphs of FIGS. 11 and 12, the upper bar graph is the tensile test result of the test piece of the aqueous emulsion E3 of the present embodiment, and the lower bar graph is the test of the aqueous emulsion E1 of the first conventional example. It is a tensile test result of a piece.

  When FIG. 11 is seen, the tensile strength of the test piece of the emulsion E3 of this embodiment is higher than the tensile strength of the test piece of the aqueous emulsion E1 of the first conventional example under any condition. Moreover, when FIG. 12 is seen, also about the elongation rate (%) at the time of a fracture | rupture, the direction of the test piece of the water-based emulsion E3 of this embodiment is higher than the test piece of the water-based emulsion E1 of a 1st prior art example. Therefore, it was confirmed that the waterstop SB3 cured and formed using the aqueous emulsion E3 of this embodiment exhibits high durability from the viewpoints of heat resistance and water resistance.

  By the way, the aqueous emulsion E3 of the present embodiment has been described that the curability is lowered when the aqueous emulsion E3 contains a water-soluble polymer such as PVA. ing. This will be described below.

Table 4 in FIG. 13 shows the specifications of the materials used in this test.
First, as shown in Table 4, as materials, an aqueous emulsion E3 of this embodiment, an aqueous emulsion E4 obtained by further mixing PVA with the aqueous emulsion E3 of this embodiment, and a urethane resin (Table 1) were prepared. And each water-based emulsion E3, E4 and urethane resin were mixed by the mixing ratio (weight ratio) of 3: 1, and this produced | generated two types of mixtures. And time until each mixture hardened | cured and felt the resistance by gelatinization was measured as hardening time. In addition, about the measurement of this resistance, it performed by palpation and visual observation.

  Table 4 shows the curing time as the test result. In the case of the aqueous emulsion E4 mixed with PVA, the curing time becomes twice or more longer than that in the case of the aqueous emulsion E3 not mixed with PVA. Yes. Therefore, when PVA was mixed with the aqueous emulsion E3 of this embodiment, it has confirmed that sclerosis | hardenability fell.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.

  In the above-described embodiment, the concrete structure 1 is illustrated as an example of the water stop target member, but the present invention is not limited thereto. For example, another cement composition such as a mortar structure may be used, or a material other than these may be used.

1 concrete structure (water-stop target member),
1h injection hole, 1pw cracked part (water stop target part),
20 injection device,
22e tank, 22u tank,
23e pump, 23u pump,
24e hose, 24u hose,
25 injection head (injection device),
25a base, 25b base side cylinder, 25c tip side cylinder,
25h Discharge port, 25j fitting,
26 mixer,
R25a1 channel, R25ae channel, R25au channel,
SP25b in-cylinder channel, SP25c channel,
UPP urethane prepolymer,
E1 aqueous emulsion, E2 aqueous emulsion, E3 aqueous emulsion,
E4 aqueous emulsion,
W water,
K1 surfactant, K3 surfactant,
J1 resin solids, J2 resin solids, J3 resin solids,
KJ1 resin solid cured product, KJ2 resin solid cured product,
KJ3 cured resin solids,
KPU polyurethane resin cured product, KJ3PU cured product,
SB1 still water, SB2 still water, SB3 still water,
BS1 interface, BS2 interface, BS3 interface,
Z1 filler,

Claims (6)

  An aqueous emulsion comprising water, a resin solid having a molecular structure having a hydroxyl group, and an anionic surfactant. The aqueous emulsion according to claim 1,
The water-based emulsion characterized in that the resin solid content has a weight average molecular weight of more than 1000 and 2000000 or less. An aqueous emulsion according to claim 1 or 2,
An aqueous emulsion characterized by not containing a water-soluble polymer. The aqueous emulsion according to any one of claims 1 to 3,
The aqueous emulsion, wherein the resin solid content has a hydroxyl value in the range of 1 to 100.   The water-stopping target portion is water-stopped by injecting the water-based emulsion according to any one of claims 1 to 4 and a liquid urethane prepolymer into the water-stopping target portion of the water-stopping target member. The still water construction method.   6. The water stop construction method according to claim 5, wherein the mixing of the aqueous emulsion and the liquid urethane prepolymer is performed such that the weight ratio falls within a range of 100: 21 to 100: 100. The still water construction method.

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