JP6673714B2 - Chemicals for construction foundation - Google Patents

Description

  INDUSTRIAL APPLICABILITY The present invention is used in ground improvement for hardening fragile ground and rock mass in a wide range of fields such as construction materials for civil engineering and construction, and can be used as a base for fixing a gantry or a steel material, for example. It relates to chemicals for construction foundations.

  Conventionally, when improving the foundation ground of a structure, or constructing a structure with high load strength on fragile ground or rock, strengthening of the retaining wall, furthermore, earth retaining and waterproofing, etc. Ground improvement with chemicals has been performed. The chemicals for the construction foundation that can be used for this ground improvement are appropriately selected according to the properties of the ground, etc., but since they are relatively inexpensive, mainly cement-based chemicals for construction foundations are frequently used. Have been.

  As the chemical solution for cement-based construction foundation, for example, as shown in Patent Document 1, a cement-based material, a polymer compound having at least one functional group selected from the group consisting of a carboxylic acid group and a sulfonic acid group, and There is a powdery cement composition for ground improvement containing at least one powdery polymer compound selected from the group consisting of salts thereof. As in the case where the admixture is added later, the kneading is not complicated and the construction efficiency is improved.

  However, the disadvantages of the chemicals for cement-based construction foundations are that they have a high fluidity and a long solidification time, so that it takes several days to solidify after construction, and a high humidity environment or water In such an environment, there is a problem that the hardening is further slowed down and the physical properties are deteriorated. In addition, there is a problem that construction is difficult, especially in rainy weather, and the construction time is limited.

  In addition, there is a method of using a fixing chemical to fix a reinforcing material made of a steel material or a long bolt to the ground or rock, and as a fixing chemical, for example, as described in Patent Document 2 A long bolt fixing chemical solution comprising a liquid A having water glass and a tertiary amine catalyst as essential components, and also having glycerin as an essential component, and a solution B having diphenylmethane diisocyanate as an essential component is known. I have. In this case, by further mixing glycerin with the liquid A containing water glass and a tertiary amine catalyst as essential components, the compatibility between the water glass and the tertiary amine catalyst is improved. Separation could be suppressed, and a stable cured product having a stable expansion ratio could be obtained.

  However, such a fixing chemical is generally designed on the assumption that mixing is performed for a short time of about several seconds by a mixer unit and injection by pumping of the chemical is performed by a pump, for example, mixing by a hand mixer or mixing by a concrete mixer. No mixing is assumed. For this reason, there is a problem in that the fixing chemical solution is not sufficiently mixed when mixed with a hand mixer and is small when it is 10 kg or more, and easily separated when mixed with a hand mixer. Furthermore, the silica sol chemical liquid obtained by mixing and reacting the water glass and the isocyanate exhibits thixotropic properties and flows without any problem when an external force is applied, such as during pumping, but when the chemical liquid after stirring is allowed to stand for a while. However, there is a problem in that the fluidity of the chemical solution decreases, and when the chemical solution is injected, it needs to be stirred again. In addition, when the mixed and stirred chemical is transported by a bucket or the like and injected, for example, the fluidity of the chemical is impaired during the transfer, which causes a problem in construction.

JP-A-11-256161 JP-A-2002-285155

  Here, the present invention has been made in view of the above-mentioned circumstances, and a solution thereof is to provide a liquid A prepared by mixing water glass and a polyol as essential components, and a polyisocyanate. An object of the present invention is to provide a chemical liquid for construction foundation comprising a liquid B as an essential component, which has excellent workability.

  And, in order to solve the above-mentioned problems, the present invention can be suitably implemented in various aspects as listed below, but each aspect described below is in any combination, Can be adopted. It should be understood that the aspects and technical features of the present invention are not limited to those described below, but can be recognized based on the inventive idea understood from the description of the entire specification. It should be.

(1) Liquid A containing water glass and a reaction catalyst as essential components, and containing the reaction catalyst in a ratio of 0.001 to 0.5 part by mass with respect to 100 parts by mass of the solid component in the water glass. And a liquid for construction foundation comprising a liquid B containing a polyisocyanate as an essential component, wherein the amount of water contained in the liquid A is 35 to 70% by mass of the liquid A, and The chemical liquid for construction foundations, wherein the amount of water contained in the total chemical liquid prepared by mixing the liquid B is 15 to 25% by mass of the total chemical liquid.
(2) The chemical for building foundations according to the aspect (1), wherein the reaction catalyst is an amine catalyst.
(3) The construction foundation according to the above aspect (1) or (2), wherein the mixing ratio of the liquid A and the liquid B is 1: 1 to 1: 3 by mass. Drug solution.
(4) The chemical liquid for construction foundation according to any one of the aspects (1) to (3), wherein a polyol is further blended into the liquid A.
(5) The chemical solution for construction foundation according to the aspect (4), wherein the polyol has a hydroxyl value of 10 to 600 mgKOH / g.
(6) The liquid according to any one of the aspects (1) to (5), wherein a silicone-based surfactant is further added to the liquid A and / or the liquid B. Chemicals for construction foundations.
(7) the water glass is an aqueous solution of sodium silicate, and the molar ratio of S iO ₂ / Na ₂ O of the sodium silicate, characterized in that it is in the range of 2.0 to 3.0 The chemical liquid for construction foundation according to any one of the above aspects (1) to (6).
(8) The chemical liquid for a construction foundation according to any one of the aspects (1) to (7), which provides a reaction product having an expansion ratio of 1 to 2 times.

  And according to such a configuration according to the present invention, in a urethane-based chemical for construction foundation containing water glass, a feature that can be easily and safely applied without using a special device such as an injection facility. In addition, it stably suppresses the foaming ratio to a low level, achieves the same strength as a chemical solution for concrete-based building foundations in a short time, and can be used in an environment where water flows out on site or on rainy days. Thus, a medicinal solution that can be used without any problem was provided.

  In short, the present invention relates to a two-part type liquid for construction foundation comprising a liquid A and a liquid B, which is cured and solidified, wherein the liquid A is prepared by mixing a water glass and a polyol, and the liquid B Is prepared by blending a polyisocyanate, while a small amount of a reaction catalyst is further blended into the solution A, and the amount of water in the solution A and the amount of water in the whole of the solution A and the solution B are specified. As a result, the achievement of the intended purpose has significant characteristics.

In the liquid A, which is one of the two liquids constituting the chemical liquid for construction foundations according to the present invention, the water glass, which is one of the essential components, is, as is known, an aqueous solution of a soluble silicate compound. It is. Here, examples of the silicate compound include, for example, sodium silicate, potassium silicate, sodium metasilicate, potassium metasilicate, lithium silicate, ammonium silicate, alkyl silicate, and the like.In particular, in the present invention, Sodium silicate (sodium silicate), which is easily available and inexpensive, is preferably used. When sodium silicate is used, the molar ratio of SiO ₂ / Na ₂ O is preferably in the range of 2.0 to 3.0. If the molar ratio is less than 2.0, the compatibility with the reaction catalyst and additives such as polyols is deteriorated, and the formation of a gel-like substance is apt to be caused, so that long-term storage becomes difficult. . On the other hand, when the molar ratio is larger than 3.0, the viscosity becomes high, so that it becomes difficult to design a low-viscosity liquid A, the dispersion stability of the liquid is reduced, and the freezing point is further increased. There is a problem that it cannot be used in winter.

  By the way, various kinds of water glass as described above are commercially available, and such a commercially available product can be appropriately selected and used in the present invention. The aqueous solution of sodium silicate is specified in JIS standard (JIS K1408) and is known as No. 1, No. 2, No. 3, etc., and is compounded according to this JIS standard. If it is a compound of No. 4, No. 5, etc., or a compound of No. 1.5, No. 2.5, etc., it is possible to use them. Further, the ratio of the solid component in the water glass in the form of such an aqueous solution varies depending on each item of the JIS standard, the type of the water glass, and the like. From the viewpoint of properties and the like, water glass containing a solid component in a content of generally about 20 to 60% by mass, preferably 35 to 55% by mass is advantageously used.

The solid component in the water glass is a water glass in the form of an aqueous solution from which volatile substances such as water and a solvent are removed (non-volatile components), and the solid component is a silicate such as sodium silicate. It substantially corresponds to the compound. And such a solid component will be measured as follows. That is, 10 g of a sample (water glass) was weighed and stored in a sample dish (length: 90 mm, width: 90 mm, height: 15 mm) made of aluminum foil, and heated at 180 ± 1 ° C. After being placed on a plate and allowed to stand for 20 minutes, the sample dish is inverted with the sample fixed on its inner surface, and left on the heating plate for another 20 minutes to dry the sample. Do. Next, the sample dish is taken out from the heating plate, allowed to cool in a desiccator, weighed, and the ratio of the solid component in the water glass is determined by the following equation.
Solid component (%) = [mass (g) after drying / mass (g) before drying] × 100

  Examples of the reaction catalyst used in the present invention include an amine catalyst and a metal catalyst, and an amine catalyst is particularly preferably used. The reaction catalyst is used in an amount of 0.001 to 0.5 part by mass, preferably 0.002 to 0.3 part by mass, more preferably 0 to 100 parts by mass, based on 100 parts by mass of the solid component in the water glass of the liquid A. 0.005 to 0.2 parts by mass. By the action of such a reaction catalyst, the reaction between the isocyanate and water and water glass is promoted, and the physical strength required as a chemical liquid for construction foundation can be obtained, and separation during mixing can be suppressed. When the amount of the catalyst exceeds 0.1 parts by mass, it is difficult to control the reaction, it is difficult to take the necessary working time for rupture and construction of the foam by gas pressure, and foaming occurs. As a result, sufficient strength cannot be obtained. In addition, since the amine catalyst has a strong odor, when the amount of the amine catalyst used as the reaction catalyst increases, there is also a problem that the working environment is deteriorated due to the odor in the work on site. On the other hand, if the added amount of the catalyst is less than 0.001 part by mass, especially when a large amount of the chemical solution is mixed, it becomes easy to separate at the time of mixing, so that there is a problem that the mixing time becomes long.

  As described above, in the present invention, the amount of the reaction catalyst used is suppressed to 0.1% by mass or less with respect to the solution A. Therefore, when an amine catalyst is used as the reaction catalyst, the addition thereof is extremely low. The amount of odor can be suppressed to a small amount, whereby the problem of odor can be advantageously avoided, and the advantage that the working environment can be improved is also exhibited.

  Here, examples of the amine catalyst that is advantageously used as a reaction catalyst include known catalysts that have been conventionally used for urethane reactions, and for example, a tertiary amine catalyst or the like can be used. In addition, when water is used as a foaming agent source, this amine catalyst has a foaming catalyst having an action of accelerating the reaction between the isocyanate component and water, and has an action of accelerating the reaction between the isocyanate component and the polyol component. Resinization catalysts, isocyanurate formation catalysts that have the effect of promoting trimerization of isocyanate components, and the like are available.

  Specifically, for example, foaming catalysts include N, N, N ', N ", N" -pentamethyldiethylenetriamine, N, N, N'-triethylaminoethylethanolamine, bis (dimethylaminoethyl) ether , N, N, N'-trimethylaminoethylpiperazine, N, N-dimethylaminoethoxyethanol, triethylamine and the like. Examples of the resination catalyst include N, N, N ', N'-tetramethylethylenediamine, N, N, N', N'-tetramethylpropanediamine, N, N, N ', N'-tetramethylhexane. Diamine, triethylenediamine, 33% triethylenediamine / 67% dipropylene glycol, N, N-dimethylaminohexanol, N, N-dimethylaminoethanol, N-methyl-N′-hydroxyethylpiperazine, N-methylmorpholine, -Methylimidazole, 1,2-dimethylimidazole and the like. Furthermore, examples of the isocyanuration catalyst include 2,4,6-tris (dimethylaminomethyl) phenol, N, N ′, N ″ -tris (dimethylaminopropyl) -hexahydro-s-triazine and the like. A tertiary amine catalyst is more preferably used among the tertiary amine catalysts.

  By the way, in the present invention, it is possible to prepare solution A by further adding water to the above-mentioned water glass. Here, the further added water mainly contributes to lowering the viscosity of the liquid A. Such water is not particularly limited as long as it does not contain dirt, dust, etc., such as pure water, tap water, distilled water, industrial water, etc., and easy-to-use industrial water or tap water is advantageously used. Become.

  And the total amount of water derived from water glass and further added water is 35 to 70% by mass, preferably 40 to 68% by mass, more preferably 45 to 65% by mass, and even more preferably 50 to 62% by mass of the whole liquid A. %. Since water glass is an aqueous solution in the state of a commercial product, by using such a commercial product, the liquid A contains water contained in the water glass. The liquid contains at least water contained in the water glass. It is to be noted that the use of the water glass in which the water content is reduced by evaporation or the like may cause instability of the water glass in the liquid A. Therefore, such a use form is not desirable. On the other hand, if the amount of water in the solution A is more than 70% by mass, the mixing stability of the water glass and the isocyanate is deteriorated, and the separation after the mixing causes problems such as insufficient expression of the strength of the binder and viscosity. It causes problems such as infiltration into soil due to being too low. On the other hand, when the amount of water in the solution A is lower than 35% by mass, it causes a variation in quality due to deterioration of storage stability of the solution A and a decrease in strength due to a decrease in mixing property between the solution A and the solution B. Cause problems.

  In addition, the amount of water contained in the total amount of the drug solution prepared by mixing the solution A and the solution B is 15 to 25% by mass, preferably 18 to 24.5% by mass of the total amount of the solution. It is adjusted so as to be preferably 20 to 24% by mass. When the amount of water with respect to the total amount is increased, the problem that the strength is not sufficiently exhibited due to foaming and liquid separation is caused because the mixing property of the liquid A and the liquid B is reduced. In addition, when the amount of water is reduced, a problem such as a reduction in strength is caused without a uniform reaction between isocyanate and water.

  Further, a polyol can be further added and blended as an element constituting the liquid A. The polyol is not particularly limited, and those conventionally used as a polyol component in a urethane resin can be used in the same manner, and include, for example, known polyether polyols and polyester polyols. Can be done. These polyols can be used alone or in combination as appropriate. Among these polyols, the polyether polyol is not particularly limited. For example, a polyhydric alcohol having at least two or more active hydrogen groups is used as an initiator, and ethylene oxide or propylene oxide is used. And those produced by adding an alkylene oxide such as Examples of the polyhydric alcohol serving as such an initiator include glycols such as ethylene glycol and propylene glycol; triols such as glycerin and trimethylolpropane; pentaerythritol; sugars such as sucrose and sucrose; amines such as ethylenediamine; Alkanolamines such as ethanolamine and diethanolamine can be exemplified. Further, even in the polyester polyol, it is not particularly limited, for example, polyhydric alcohol, succinic acid, adipic acid, sebacic acid, maleic acid, phthalic acid, terephthalic acid, trimellitic acid, dimer acid and the like Polycarboxylic acid-based polyester polyols obtained by reacting with polycarboxylic acids; lactone-based polyester polyols obtained by ring-opening polymerization of lactones and the like;

  Further, among such polyols, polyether polyols are suitably used for reasons such as weather resistance and long-term stability, and more preferably, glycols, glycerin, and alkylene oxide are used as initiators selected from sugars. The added polyether polyol is preferably used.

  In general, the polyol as described above preferably has a molecular weight of about 200 to 10000, and more preferably has a molecular weight of about 200 to 5000. When the molecular weight is smaller than 200, when contacting with water glass, there is a problem that a temporary coagulation is caused, and there is a fear that the mixing at the time of manufacturing the liquid A is hindered. On the other hand, when the molecular weight is larger than 10,000, There is a possibility that a problem that the compatibility when the liquid A and the liquid B are mixed is deteriorated.

  The hydroxyl value of such a polyol is preferably in the range of 10 to 600 mgKOH / g, more preferably 20 to 580 mgKOH / g. When the hydroxyl value is larger than 600, the time until curing becomes longer, and before solidification, the water glass and the isocyanate may cause separation, and it takes too much time to develop the strength. There is a difficult problem.

  The blending amount of the polyol is 0 to 100 parts by mass, preferably 2 to 70 parts by mass, more preferably 2 to 50 parts by mass, based on 100 parts by mass of the solid component of the water glass in the liquid A. is there. If the blending amount of the polyol is more than 100 parts by mass, the expansion ratio is increased, which is not preferable for applications where the expansion ratio is desired to be suppressed as in the present invention. In addition, the cost is increased, and the economy is impaired. In the present invention, the polyol may or may not be blended, but it is desirable to blend the polyol in order to improve the mixability and physical properties.

  On the other hand, the liquid B, which is one of the two liquids constituting the chemical liquid for construction foundations according to the present invention, is prepared by using a polyisocyanate as an essential component, as in the prior art. At that time, the content of the polyisocyanate in the liquid B is desirably adjusted so as to be 70 to 100% by mass, preferably 80 to 100% by mass, and more preferably 90 to 100% by mass. When the content of the polyisocyanate is less than 70% by mass, there is a problem that the strength of the construction base material is reduced. It is desirable that the ratio of the polyisocyanate in the liquid B is higher, and the liquid B may be formed only with the polyisocyanate.

  The polyisocyanate which is an essential component of the liquid B is an organic isocyanate compound having two or more isocyanate groups (NCO groups) in a molecule, for example, diphenylmethane diisocyanate (MDI), polymethylene polyphenylene polyisocyanate (crude MDI) ), Aromatic polyisocyanates such as tolylene diisocyanate, polytolylene polyisocyanate, xylylene diisocyanate, and naphthalene diisocyanate; aliphatic polyisocyanates such as hexamethylene diisocyanate; alicyclic polyisocyanates such as isophorone diisocyanate; Examples include urethane prepolymers having an isocyanate group, modified isocyanurate of polyisocyanate, and modified carbodiimide. These polyisocyanate components may be used alone or in combination of two or more. Generally, MDI or crude MDI is preferably used from the viewpoint of reactivity, economy, handling, and the like.

  In order to improve the mixing property between the hydrophilic liquid A and the hydrophobic liquid B, a surfactant is added to the liquids A and B constituting the chemical liquid for construction foundation of the present invention. Can be done. This surfactant may be added to either the solution A or the solution B, or may be added to both. Examples of the surfactant include silicone surfactants such as polyoxyalkylene-modified dimethylpolysiloxane and polysiloxaneoxyalkylene copolymer; nonionic surfactants such as polyoxy fatty acid ester and sorbitan fatty acid ester; alkylbenzene sulfone Examples include anionic surfactants such as acid salts and carboxylate salts, and among them, silicone surfactants are preferably used from the viewpoint of improving mixing properties. These may be used alone or in combination of two or more. Further, such a silicone surfactant is added at a ratio of 0.05 to 2% by mass of the total amount of the solution A and the solution B, preferably 0.08 to 1% by mass, more preferably 0.1 to 1% by mass. It is used at a ratio of 1 to 0.5% by mass.

  Further, it is possible to add the same additives as in the prior art to the above-mentioned liquids A and B constituting the chemical liquid for construction foundation according to the present invention, depending on the purpose of use. For example, examples of the additive for the liquid A include a flame retardant and a viscosity reducing agent. These additives are used in a proportion of 0 to 15 parts by mass, preferably 0 to 10 parts by mass, based on 100 parts by mass of the solid components in the water glass constituting the liquid A. In addition, examples of the additive to the liquid B include a flame retardant, a viscosity reducing agent, and the like. Among them, the viscosity reducing agent is 0 to 20 parts by weight, preferably 100 parts by weight of the polyisocyanate. The flame retardant is used in an amount of 0 to 10 parts by mass, and the flame retardant is used in an amount of 0 to 50 parts by mass, preferably 0 to 40 parts by mass with respect to 100 parts by mass of the polyisocyanate. It will be.

  Here, examples of the flame retardant include a bromine-based flame retardant, a chlorine-based flame retardant, a phosphorus-based flame retardant, a halogenated phosphoric ester, and an inorganic flame retardant. These may be used alone or in combination of two or more. Among these, phosphoric acid esters and halogenated phosphoric acid esters are preferably used in that they have a small burden on the environment and also function as a viscosity reducing agent for the foamable composition. In addition, as a phosphoric acid ester, trimethyl phosphate, triethyl phosphate, tributyl phosphate, trixylenyl phosphate, etc. are mentioned, for example. Examples of the halogenated phosphoric acid ester include, for example, tris (chloroethyl) phosphate, tris (2-chloropropyl) phosphate, tris (dichloropropyl) phosphate, tetrakis (2-chloroethyl) dichloroisopentyldiphosphate, and polyoxyalkylenebis. (Dichloroalkyl) phosphate and the like.

  In addition, the viscosity reducing agent is used as a solvent, is dissolved in the solution A or the solution B, and has a function of reducing the viscosity of those solutions, and is particularly limited as long as it has such a function. Examples thereof include ethers such as ethyl cellosolve and butyl cellosolve; cyclic esters such as propylene carbonate; alkyl esters of dicarboxylic acid, esters such as ethylene glycol monomethyl ether acetate; and petroleum hydrocarbons. No. These may be used alone or in combination of two or more.

  Incidentally, the liquid A and the liquid B prepared according to the present invention have a (kinematic) viscosity at a temperature of 25 ° C. of 500 mPa · s or less, preferably 10 to 500 mPa · s, more preferably 40 to 250 mPa · s. It will be adjusted so that If the viscosity is higher than 500 mPa · s, the liquid A and the liquid B become viscous liquids, which causes problems such as poor fluidity during mixing.

  When using the chemical liquid for construction foundation according to the present invention comprising the liquid A and the liquid B as described above, the two liquids are mixed at the time of use and injected into the target ground, bedrock, or the like. The base is formed by being introduced by pouring or the like and being cured by reaction. The mixing ratio (A: B) of the solution A and the solution B can be appropriately changed depending on the content of the hydroxyl group in the solution A and the content of the NCO group in the solution B. A: B = 1: 1 to 1: 3, preferably in the range of 1: 1 to 1: 2. The method of using the liquid A and the liquid B is also not particularly limited as long as the two liquids can be surely mixed immediately before their use, and conventionally known injection methods and pouring methods. Will be appropriately adopted.

  The foaming ratio when the solution A and the solution B are mixed is usually set to be 1 to 2 times, preferably 1 to 1.5 times, more preferably 1 to 1.3 times. Because The lower the foaming ratio, the better. If the foaming ratio is larger than 2, effective strength may not be obtained.

  Further, the curing time (time from mixing to curing) when mixing the A liquid and the B liquid is 5 minutes or more, preferably 5 to 120 minutes, more preferably 10 to 60 minutes. . If the curing time is less than 5 minutes, for example, when a chemical for construction foundation is used for fixing a steel material, if the chemical for construction foundation is poured and cured in a short time, the chemical for construction foundation is poured. In some cases, the position of the steel material may be shifted during the operation, so that it is impossible to return the position and to perform the fine adjustment. If there is more than 5 minutes from mixing to hardening, it is possible to adjust the position of the steel material even after pouring the chemical for construction foundation. Further, the chemical liquid for construction foundation of the present invention is surely hardened within several hours, so that it is not necessary to spend several days for curing unlike the chemical liquid for cement-based construction foundation. The chemical liquid for a construction foundation of the present invention may be used in combination with a conventional chemical liquid for a cement-based construction foundation.For example, the foundation is fixed with the chemical liquid for a construction foundation of the present invention, and the entire base is used for the cement-based construction foundation. Even if it fixes with a chemical solution, there is no problem at all.

  In addition, the liquid flow time (time during which the fluidity is maintained) when mixing the A liquid and the B liquid is 3 minutes or more, preferably 5 to 60 minutes, more preferably 10 to 40 minutes. desirable. Since the reaction starts after the liquid A and the liquid B are mixed, the fluidity decreases with time. For this reason, if the flow time is less than 5 minutes, especially when a large amount of a chemical solution is mixed and used, it takes a long time to uniformly mix the mixed solution and construct as a foundation, so the construction is completed. There is a risk that the fluidity will be lost by the time the work is performed and construction will not be possible.

  Hereinafter, some examples and comparative examples of the present invention will be shown to clarify the present invention more specifically. However, the present invention is not limited by the description of such examples. Needless to say, it is not. Further, in addition to the following examples, the present invention may further include various changes and modifications based on the knowledge of those skilled in the art without departing from the spirit of the present invention, in addition to the specific description described above. , Improvements and the like can be added.

  In addition, along with the characteristics (viscosity) of the liquid A and the liquid B obtained in the following Examples and Comparative Examples, a foam as a construction base material obtained by mixing and reacting and foaming the liquid A and the liquid B. The findings after foaming, compressive strength, and permeation distance were measured or evaluated according to the following methods, respectively. Further, "%" and "part" shown below are all based on mass.

(1) Viscosity The viscosity was measured according to JIS-K-7117.

(2) Foaming ratio Liquid A and liquid B having the compositions shown in Tables 1 to 4 adjusted to 25 ° C. were mixed at a predetermined mixing ratio shown in Tables 1 to 4, and the total amount was 1 kg. After preparing a mixture, the mixture was placed in a 2 liter disc cup and thoroughly mixed and stirred. Then, the foaming height after the completion of the reaction was measured to determine the foaming ratio.

(3) Mixability The solution A and the solution B each adjusted to 25 ° C. are measured at a predetermined mixing ratio so that the total amount is 5 L, and is poured into a 10 L plastic container. Then, the mixing state at the time of stirring and mixing for a predetermined time (30 seconds or 60 seconds) using a paint stirring blade and being rotated at 1500 rpm by a hand mixer is evaluated. The mixed solution was allowed to stand, and if no separation was observed, it was determined that the mixing property was good.
◎: mixed in 30 seconds ○: mixed in 60 seconds ×: separated

(4) Liquid flowability (flow time)
The solution A and the solution B adjusted to 25 ° C. were weighed at a predetermined mixing ratio so that the total amount was 1 kg, and the mixture was placed in a 2 liter disc cup and thoroughly mixed and stirred. Then, the container is tilted every predetermined time from the start of the mixing and stirring, and even when the container is tilted by 45 ° or more, the time during which the contents do not flow is obtained, and the time from the start of the mixing and stirring until the time when the flow stops flowing is defined as the flow time. It was measured. This flow time is 5 minutes or more.

(5) Curing time Liquid A and liquid B adjusted to 25 ° C. are mixed and reacted at a predetermined mixing ratio, the time until gas (steam) is generated from the generated reaction cured product, and the surface of the reaction cured product. The time until the nail was no longer stuck was measured, and the earlier one was taken as the end point of the curing time. The curing time is considered to be 5 minutes or more.

(6) Appearance The cured product after the foaming test was visually observed, and the presence or absence of appearance defects such as deformation due to foaming, uneven curing due to separation, and large cracks due to internal pressure was confirmed. Out of three cured product samples, all three had poor appearance, and one or two had poor appearance, and all three had poor appearance. When there was no, it was evaluated as "O".

(7) Strength A solution and B solution were mixed and stirred at a predetermined mixing ratio, poured into a bottomed cylindrical shape having an inner part with an open upper part: 50 mm × height: 120 mm, and cured at 30 ° C. for 24 hours. A test specimen having a diameter of 50 mm and a height of 100 mm was cut out from the reaction product in the mold and measured according to JIS-K-7220. The strength is 10 MPa or more.

(Example 1)
-Preparation of solution A-
As the water glass, an aqueous solution containing 40% of a solid component of sodium silicate No. 2 (SiO ₂ / Na ₂ O molar ratio: 2.5) was used, and 10 parts of polyol and 0.01 part of an amine catalyst were added to 100 parts thereof. In addition, the mixture was uniformly mixed to obtain a liquid A. The viscosity of the obtained solution A was measured, and the results are shown in Table 1 below.

  The polyol used here was polypropylene glycol (PP-1000: manufactured by Sanyo Chemical Industries, Ltd.) having a molecular weight of 1,000, two functional groups, and a hydroxyl value of 112 mgKOH / g, and the amine catalyst was a tertiary amine catalyst (TOYOCAT). -DT: manufactured by Tosoh Corporation).

-Preparation of solution B-
To 100 parts of the polyisocyanate was added 0.5 part of a surfactant, and the mixture was uniformly mixed to obtain a liquid B. Then, the viscosity of the obtained liquid B was measured, and the results are shown in Table 1 below. Here, polymeric MDI (Cosmonate M-200: manufactured by Mitsui Chemicals, Inc.) is used as the isocyanate, and alkylene oxide-modified silicone (L-6970: manufactured by Momentive Performance Materials) is used as the surfactant. Was used.

  Next, the solution A and the solution B obtained above were combined at a mass ratio of 2: 3, uniformly mixed and reacted, and then various evaluation tests were performed according to the above-described evaluation method. The results are shown in Table 1 below.

(Example 2)
In Example 1, except that the polyol was polypropylene glycol (PP-200: manufactured by Sanyo Chemical Industries, Ltd.) having a molecular weight of 200, a number of functional groups of 2, and a hydroxyl value of 560 mgKOH / g, a procedure similar to that of Example 1 was used. Each test was performed. The obtained results are shown in Table 1 below.

(Example 3)
In Example 1, a polyol was used in the same manner as in Example 1 except that the polyol was a polyether polyol (FA-703: manufactured by Sanyo Chemical Industries, Ltd.) having a molecular weight of 5000, a number of functional groups of 3, and a hydroxyl value of 33 mgKOH / g. , Respectively. The obtained results are shown in Table 1 below.

(Example 4)
Each test was performed in the same manner as in Example 1 except that the polyol was glycerin (purified glycerin: manufactured by Kao Corporation) having a molecular weight of 92, a number of functional groups of 3, and a hydroxyl value of 1,830 mgKOH / g in Example 1. Was. The obtained results are shown in Table 1 below.

(Example 5)
Each test was performed in the same manner as in Example 1 except that the polyol was changed to 20 parts. The obtained results are shown in Table 1 below.

(Example 6)
Each test was performed in the same manner as in Example 1 except that in Example 1, the polyol was changed to 5 parts, and 10 parts of water was further added to the solution A. The obtained results are shown in Table 1 below.

(Example 7)
The test was performed in the same manner as in Example 6, except that the addition amount of water was 20 parts and the liquid A and the liquid B were combined at a mass ratio of 1: 2. Was done. The obtained results are shown in Table 1 below.

(Example 8)
The test was performed in the same manner as in Example 6, except that the amount of water added was 35 parts and the liquid A and the liquid B were combined at a mass ratio of 1: 2. Was done. The obtained results are shown in Table 2 below. The amount of water contained in the liquid A is 67.8% by mass of the liquid A, and the amount of water contained in the total amount of the liquid A and the liquid B is 17.9% by mass of the total amount. is there.

(Example 9)
In Example 1, tests were performed in the same manner as in Example 1 except that a surfactant (L-6970) was added to Liquid A and no surfactant was added to Liquid B. The obtained results are shown in Table 2 below.

(Example 10)
In Example 1, each test was performed in the same manner as in Example 1 except that the surfactant was not added to the solution B. The obtained results are shown in Table 2 below.

(Example 11)
In Example 1, a test was performed in the same manner as in Example 1 except that the surfactant (L-6970) was used in an amount of 0.1 part. The obtained results are shown in Table 2 below.

(Example 12)
In Example 1, a test was performed in the same manner as in Example 1 except that the amount of the surfactant (L-6970) was changed to 3 parts. The obtained results are shown in Table 2 below.

(Example 13)
In Example 1, each test was performed in the same manner as in Example 1 except that no polyol was added. The obtained results are shown in Table 2 below.

(Example 14)
In Example 13, tests were performed in the same manner as in Example 13 except that the amine catalyst was another tertiary amine catalyst (TOYOCAT-ET: manufactured by Tosoh Corporation). The results obtained are shown in Table 3 below.

(Example 15)
Tests were performed in the same manner as in Example 13 except that the amine catalyst was changed to another tertiary amine catalyst (Kaorizer No. 26: manufactured by Kao Corporation). The results obtained are shown in Table 3 below.

(Example 16)
In Example 13, tests were performed in the same manner as in Example 13, except that the amine catalyst was changed to another tertiary amine catalyst (TOYOCAT-MR: manufactured by Tosoh Corporation). The results obtained are shown in Table 3 below.

(Example 17)
Tests were performed in the same manner as in Example 13 except that 0.05 parts of the amine catalyst was used and Solution A and Solution B were combined at a mass ratio of 1: 2. went. The results obtained are shown in Table 3 below.

(Example 18)
The test was performed in the same manner as in Example 13 except that 0.1 part of the amine catalyst was used and Solution A and Solution B were combined at a mass ratio of 1: 3 in Example 13. went. The results obtained are shown in Table 3 below.

(Example 19)
Each test was performed in the same manner as in Example 13 except that the amount of the amine catalyst was changed to 0.002 parts. The results obtained are shown in Table 3 below.

(Comparative Example 1)
Each test was performed in the same manner as in Example 1 except that one part of the amine catalyst was used in Example 1. The results obtained are shown in Table 4 below.

(Comparative Example 2)
In Example 7, tests were performed in the same manner as in Example 7 except that the amine catalyst was changed to 1 part. The results obtained are shown in Table 4 below.

(Comparative Example 3)
In Comparative Example 1, tests were performed in the same manner as in Comparative Example 1 except that the polyol was used in 40 parts and the liquid A and the liquid B were combined at a mass ratio of 1: 4. The results obtained are shown in Table 4 below.

(Comparative Example 4)
Each test was performed in the same manner as in Example 15 except that the amount of the amine catalyst was changed to 1 part. The results obtained are shown in Table 4 below.

(Comparative Example 5)
In Example 13, 15 parts of water was further added to the solution A, and the solution A and the solution B were combined in a mass ratio of 1: 1 according to the same method as that of the example 13, respectively. The test was performed. The results obtained are shown in Table 4 below.

(Comparative Example 6)
In Example 13, 50 parts of water was further added to the liquid A, and the liquid A and the liquid B were combined in a mass ratio of 1: 3 according to the same method as that of the liquid crystal in Example 13, respectively. The test was performed. The results obtained are shown in Table 4 below.

(Comparative Example 7)
Example 13 was the same as Example 13 except that 20 parts of water and 10 parts of glycerin were added to the solution A and the solution A and the solution B were combined at a mass ratio of 1: 1. Each test was performed according to the same method as described above. The results obtained are shown in Table 4 below.

(Comparative Example 8)
In Example 13, the amine catalyst was 0.3 parts, 100 parts of water was further added to the liquid A, water glass was not added, and the liquid A and the liquid B were mixed at a mass ratio of 1: 3. Each test was performed in the same manner as in Example 13 except that the combinations were made in proportions. The results obtained are shown in Table 4 below.

(Comparative Example 9)
In Example 13, tests were performed in the same manner as in Example 13 except that the amine catalyst was not added. The results obtained are shown in Table 4 below.

  In Table 4, those that could not be measured were those that could not be measured due to failure to produce a test piece or damage due to cracks or the like.

As is clear from the results of Examples 1 to 19 shown in Tables 1 to 3, the amount of the reaction catalyst in the solution A was regulated according to the present invention. It was recognized that by adjusting the amount of water in the whole liquid mixture with the liquid B within a predetermined range, excellent properties were exhibited in the workability and the physical properties of the molded article (cured product). In contrast, as is clear from the results of Comparative Examples 1 to 9 shown in Table 4 above, in Comparative Examples 1 to 4 in which the amount of the reaction catalyst (amine catalyst) used was large, the flow time and the curing time were short, The workability was poor. Further, in Comparative Examples 3 and 5 to 8 in which the amount of water is out of the range of the present invention, it is difficult to cause an effective curing reaction, and the physical properties of the molded article (cured product) are measured. It was impossible to do it. Furthermore, in Comparative Example 9 in which no reaction catalyst was used, the workability was poor.

Claims (8)

A liquid containing water glass and a reaction catalyst as essential components, and containing the reaction catalyst in an amount of 0.001 to 0.5 part by mass with respect to 100 parts by mass of a solid component in the water glass; A liquid for a construction foundation, comprising a liquid B having an isocyanate as an essential component, and having an expansion ratio of 1 to 1.5 times ,
The amount of water contained in the liquid A is 35 to 70% by mass of the liquid A, and the amount of water contained in the total amount of the liquid prepared by mixing the liquid A and the liquid B is the total amount of the liquid. 15 to 25% by mass of the chemical liquid for construction foundation.
  The chemical solution for construction foundation according to claim 1, wherein the reaction catalyst is an amine catalyst.   The chemical liquid for a construction foundation according to claim 1 or 2, wherein a mixing ratio of the liquid A and the liquid B is from 1: 1 to 1: 3 by mass ratio.   The chemical liquid for construction foundation according to any one of claims 1 to 3, wherein a polyol is further compounded in the liquid A.   The chemical solution for construction foundation according to claim 4, wherein the polyol has a hydroxyl value of 10 to 600 mgKOH / g.   The chemical liquid for a construction foundation according to any one of claims 1 to 5, wherein a silicone-based surfactant is further added to the liquid A and / or the liquid B. The water glass is an aqueous solution of sodium silicate, and a molar ratio of SiO ² / Na ² O of the sodium silicate is in a range of 2.0 to 3.0. The chemical liquid for construction foundation according to claim 6. The chemical liquid for a construction foundation according to any one of claims 1 to 7 , wherein the amount of water contained in the liquid A is 40 to 68% by mass of the liquid A.