JP2011051842A - Inorganic aqueous composition and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inorganic aqueous composition having fluidity and allowing formation of a coating film having water-proofing property even after dried and solidified, and having incombustibility, heat resistance and weather resistance, which are characteristics of an inorganic material, and to provide a method for producing the inorganic aqueous composition. <P>SOLUTION: The inorganic aqueous composition is produced by mixing a phosphoric acid-based glass (A) containing a phosphoric acid component and a Zn component, containing the phosphoric acid component by 40 to 60 mol% in terms of P<SB>2</SB>O<SB>5</SB>but not containing an alkali metal component, with water (C) in the presence of a volatile base compound (B). The phosphoric acid-based glass (A) preferably contains a phosphoric acid component in an amount of 45 to 55 mol% in terms of P<SB>2</SB>O<SB>5</SB>and ZnO in an amount of 20 to 50 mol%. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an inorganic aqueous composition that can form a film having nonflammability, heat resistance, and weather resistance, and is excellent in coating workability, and a method for producing the same.

Conventionally, aqueous dispersions of fine metal oxides such as silica sol (colloidal silica), alumina sol, lanthanum sol, zirconia sol, and titania sol, and aqueous alkali metal silicate salts include inorganic aqueous compositions such as binders and coating agents. It is used as a thing.
Patent Document 1 below reports that phosphate glass reacts with water at room temperature to form a viscous gel.

JP 2003-217339 A (see paragraph number 0010)

  However, when an aqueous dispersion of a metal oxide such as silica sol is used alone as an inorganic aqueous composition, fine particles are bonded to each other to form a film, so that the film is easily cracked or cracked. By using these metal oxides in combination with an organic material having a high film-forming property, it becomes possible to form a film without cracks or cracks, but by containing an organic material, nonflammability, There was a problem that characteristics such as heat resistance and weather resistance were impaired.

  In addition, the alkali metal silicate aqueous solution forms a film simply by heating and removing the contained water, but the alkali metal remains even after drying and solidification, so the water resistance is low. In some cases, the formed film returned to the original aqueous solution. As a method for improving the water resistance of the aqueous alkali metal silicate salt solution, there is a method of neutralizing the remaining alkali metal salt with sulfuric acid and removing it by washing with water. Processing may not be possible and lacks versatility. Further, since the work process is complicated, there is a problem that labor and cost increase.

  Moreover, the composition prepared by reacting phosphate glass with water lacks fluidity because it is a viscous gel. For this reason, the coating method to a base material was restricted, there was a problem that lack of versatility, and furthermore, uniform thin film coating could not be performed. The flowability can be increased by increasing the amount of water added. However, as the amount of water added is increased, there is a problem that the glass component of the dispersed phase tends to settle and the storage stability as an aqueous composition is lowered. In addition, phosphate glass has a problem of poor water resistance because it is easily hydrated.

  Accordingly, an object of the present invention is an inorganic aqueous composition that is fluid, has water resistance even after drying and solidification, and can form a film having incombustibility, heat resistance, and weather resistance, which are the characteristics of inorganic materials. It is in providing a thing and its manufacturing method.

In achieving the above object, the inorganic aqueous composition of the present invention contains a phosphoric acid component and a Zn component, contains 40 to 60 mol% of the phosphoric acid component in terms of P ₂ O ₅ , and does not contain an alkali metal component. It contains acid-based glass (A), a volatile base compound (B), and water (C).

Phosphate glass (A) is an inorganic polymer in which phosphorus atoms and oxygen atoms are alternately bonded, and has partially free hydroxyl groups. This hydroxyl group acts with water to form a hydrate, but reacts with the volatile base compound (B) to form a phosphate-based glass (A) and a neutralized salt. And the fluidity of the resulting inorganic aqueous composition is improved.
Further, phosphate glass which contains a mineral-based aqueous composition (A), since it contains 40 to 60 mol% phosphoric acid component in terms _{of P} 2 _{O 5,} the neutralized salt of a volatile base compound (B) Excellent fluidity due to strong hydration. In addition, since the Zn component is contained, the phosphoric acid component is moderately hydrolyzed by the Zn component by the volatile base compound (B), and free hydroxyl groups are easily generated in the phosphoric acid glass (A). Solubility is improved. Furthermore, it is considered that the Zn component acts with a hydroxyl group in the inorganic polymer chain composed of the phosphoric acid component, and the polymer chain is electrostatically bonded to form a network structure. The water resistance and heat resistance of the formed film are further improved. Moreover, since alkali metals are not contained, the water resistance of glass is hard to be impaired, and the water resistance of the formed film is further improved.
And since it is a volatile base compound (B) that forms phosphoric acid type glass (A) and neutralization salt, it is volatile when applying an inorganic type aqueous composition to a base material, and drying. The basic compound (B) volatilizes with moisture. For this reason, the volatile base compound (B) hardly remains in the film, and the water resistance of the film is not easily impaired.
Therefore, the inorganic aqueous composition of the present invention containing the phosphate glass (A), the volatile base compound (B), and water (C) is fluid and has any shape of substrate. However, it can be applied easily and the coating workability is good. Further, since the solidified material is glass having an inorganic polymer chain, a continuous film having excellent nonflammability, heat resistance, weather resistance and the like and having no cracks or cracks can be easily formed on the substrate surface.

The phosphate glass of inorganic-based aqueous composition (A) of the present invention, 45～55Mol% phosphoric acid component in terms _{of P} 2 _{O 5,} it is preferable that the ZnO containing 20 to 50 mol%. If the phosphate glass (A) has the above composition ratio, the fluidity of the inorganic aqueous composition and the water resistance of the coating after drying and solidification can be optimized.

  The phosphate glass (A) of the inorganic aqueous composition of the present invention is at least selected from the Sc component, Ti component, V component, Cr component, Mn component, Fe component, Co component, Cu component, and Ni component. It is preferable to contain 0.1-10 mol% of 1 type in conversion of an oxide. By containing at least one selected from Sc component, Ti component, V component, Cr component, Mn component, Fe component, Co component, Cu component, Ni component, 0.1 to 10 mol% in terms of oxide, The inorganic polymer chains in the phosphate glass (A) are strongly bonded to each other, and the generation of free hydroxyl groups can be suppressed. For this reason, a coating with higher water resistance can be formed on the substrate surface.

  The phosphoric acid glass (A) of the inorganic aqueous composition of the present invention preferably contains 1 to 15 mol% of a polyvalent metal sulfate in terms of sulfate. The polyvalent metal sulfate is considered to have a property that it is difficult to form a polymer, and by containing the polyvalent metal sulfate, the regularity of the polymer chain of the phosphate glass (A) is disturbed. Thus, crystallization can be suppressed and the melting temperature can be lowered.

  In the inorganic aqueous composition of the present invention, the volatile base compound (B) is preferably ammonia. Ammonia easily evaporates when the inorganic aqueous composition is heated and solidified, and hardly remains in the solidified product, so that the water resistance of the formed coating film is not easily impaired.

On the other hand, the method for producing an inorganic aqueous composition of the present invention comprises a phosphoric acid component and a Zn component, phosphoric acid component is contained in an amount of 40 to 60 mol% in terms of P ₂ O ₅ , and no alkali metal component is contained. The system glass (A) is mixed with water (C) in the presence of a volatile base compound (B).

  According to the method for producing an inorganic aqueous composition of the present invention, phosphoric acid glass (A) is mixed with water (C) in the presence of a volatile base compound (B), whereby phosphoric acid glass. It is possible to prevent the particles from adhering to each other and forming a large lump by hydration on the surface. For this reason, the time required for dissolution of the phosphate glass (A) can be shortened, and a low-viscosity inorganic aqueous composition can be produced with high productivity.

  The inorganic aqueous composition of the present invention has fluidity, can be easily applied to any shape of substrate, and has good workability. Further, since the solidified material is glass having an inorganic polymer chain, a continuous film having excellent nonflammability, heat resistance, weather resistance and the like and having no cracks or cracks can be easily formed on the substrate surface.

  Moreover, the manufacturing method of the inorganic type aqueous composition of this invention is phosphoric acid type glass by mixing phosphoric acid type glass (A) with water (C) in presence of a volatile basic compound (B). The time required for dissolving (A) can be shortened, and a low-viscosity inorganic aqueous composition can be produced with high productivity.

[Inorganic aqueous composition]
First, the inorganic aqueous composition of the present invention will be described. The inorganic aqueous composition of the present invention is an aqueous composition containing at least a phosphate glass (A), a volatile base compound (B), and water (C).

Phosphoric glass is an inorganic polymer in which (P ₂ O ₅ ) _{n in} which phosphorus atoms and oxygen atoms are alternately bonded has a main skeleton. In addition to the oxygen forming the polymer chain, the oxygen atom is bonded to the phosphorus atom on the side chain side by a double bond. The oxygen atom corresponding to the side chain is changed to a structure in which a double bond is opened by the action of water and two hydroxyl groups are bonded as a side chain. Since the hydroxyl group increases the hydrophilicity of the phosphate glass, the phosphate glass is easily hydrated by the generation of the hydroxyl group.

Phosphate glass (A) is a phosphoric acid component containing 40 to 60 mol% in terms _{of P} 2 _{O 5,} it is preferable to contain 45~55mol%. When the content of the phosphoric acid component is less than 40 mol% in terms of P ₂ O ₅ , crystallization occurs during glass production and no glass is obtained, or even when the volatile base composition (B) is added. An aqueous composition may not be obtained. On the other hand, if it exceeds 60 mol%, the water resistance of the phosphoric acid-based glass is lowered, and it may not have a function as a binder or a coating agent. Then, the content of the phosphoric acid component, if 45～55Mol% in terms _of P ₂ O _5, even at high solid concentration can be made more inorganic water-based composition having a low viscosity.

Moreover, phosphoric acid type glass (A) contains Zn component, it is preferable to contain 20-50 mol% of ZnO, and it is more preferable to contain 35-50 mol%. It is considered that the Zn component acts on the hydroxyl group of the phosphoric acid component and bonds the polymer chains composed of (P ₂ O ₅ ) _n to form a network structure. At this time, since the free hydroxyl group is consumed, the hydrophilicity of the phosphate glass is lowered. And if the content of ZnO is less than 20 mol%, it is considered that the cross-linking action between the polymer chains composed of (P ₂ O ₅ ) _n becomes poor, and the water resistance of the phosphate glass tends to be impaired. is there. Moreover, when content of ZnO exceeds 50 mol%, it exists in the tendency for the melting temperature at the time of manufacturing phosphoric acid type glass to become high. Furthermore, the number of free hydroxyl groups in the phosphate glass decreases, the process time for obtaining an aqueous composition becomes longer, and productivity may be impaired. Furthermore, the viscosity of the resulting inorganic aqueous composition tends to increase.

Moreover, phosphate glass (A) does not contain an alkali metal component. Alkali metals such as Li, Na, K, Rb, and Cs have no effect of crosslinking between polymer chains composed of (P ₂ O ₅ ) _n and are components that impair the water resistance of phosphate glass. By not containing an alkali metal component, water resistance can be improved.

  The phosphate glass (A) further comprises at least one selected from Sc component, Ti component, V component, Cr component, Mn component, Fe component, Co component, Cu component, and Ni component. It is preferable to contain 0.1-10 mol% in conversion, and it is more preferable to contain 0.5-5 mol%.

The metal component reacts strongly with the hydroxyl group of the polymer chain composed of (P ₂ O ₅ ) _n , and the water resistance of the phosphate glass is improved. In addition, since the metal component has secondary effects such as ultraviolet absorption ability and infrared scattering, it is also useful for protecting a substrate as the binder or coating agent of the inorganic aqueous composition of the present invention. . And if content of the said metal component is less than 0.1 mol% in conversion of an oxide, almost no addition effect is seen, and when it exceeds 10 mol%, the melting temperature at the time of manufacturing phosphoric acid type glass is high. Or it may become easy to crystallize. Of the above metal components, it is more preferable to use a Ti component, an Fe component, a Cu component, and a Ni component from the viewpoint of economy.

The phosphate glass (A) further preferably contains a polyvalent metal sulfate in an amount of 1 to 15 mol%, more preferably 5 to 15 mol%, more preferably 8 to 15 mol% in terms of sulfate. It is particularly preferable to do this. In a glass composition, when there are few metal oxide seed | species to comprise, it will be easy to crystallize and vitrification may become difficult. The SO ₄ component in the polyvalent metal sulfate is less likely to have a higher molecular weight than the phosphoric acid component, and in the phosphate glass, the (P ₂ O ₅ ) _n polymer structure is disturbed and the crystallization of It has the effect of suppressing or lowering the melting temperature. For this reason, vitrification at a lower temperature becomes possible by containing the polyvalent metal sulfate. When the content of the polyvalent metal sulfate is less than 1 mol% in terms of sulfate, the effect of addition is poor, and when it exceeds 15 mol%, the water resistance of the phosphate glass tends to be impaired.

The polyvalent metal sulfate is not particularly limited, and examples thereof include ZnSO ₄ , CuSO ₄ , Fe ₂ (SO ₄ ) _3, and ZnSO because it reacts easily at the time of preparing a slurry before melting phosphate glass. ₄ is preferred.

  The phosphate glass (A) may further contain a polyvalent metal component (other polyvalent metal component) other than the metal components described above. However, when alkaline earth metals such as Mg, Ca, Ba, and Sr are used, crystallization tends to occur, and when the glass cannot be vitrified or reacted with the volatile base composition (B), the aqueous composition May not be obtained. The content of other polyvalent metal components is preferably 5 mol% or less, and more preferably 1 mol% or less.

The phosphoric acid-based glass (A) used in the inorganic aqueous composition of the present invention is composed of a composition containing 45 to 55 mol% of P ₂ O ₅ and 20 to 50 mol% of ZnO and no alkali metal component. preferable. The phosphate glass having the above composition can optimize the fluidity of the inorganic aqueous composition and the water resistance of the coating film after drying and solidification. Further, when the phosphate glass is vitrified, a homogeneous phosphate glass can be obtained at a melting temperature of 900 to 1500 ° C. If the melting temperature at the time of vitrification is less than 900 ° C, an unmelted product may be formed, and a homogeneous phosphate glass may not be obtained. If it exceeds 1500 ° C, volatilization of the phosphoric acid component tends to occur. Thus, it is difficult to obtain a phosphate glass having a desired composition ratio. The melting temperature is preferably 900 to 1300 ° C, more preferably 900 to 1100 ° C.

  The phosphate glass (A) used for the inorganic aqueous composition of the present invention can be produced, for example, as follows. That is, phosphoric acid components such as orthophosphoric acid, metaphosphoric acid, or polyphosphoric acid, and metal oxides such as Zn, oxides, hydroxides, carbonates, etc. The sulfate is further mixed in an aqueous medium. Then, phosphate is generated from this mixed solution by a solid-liquid reaction. Then, the water used for the reaction is removed by heating, and then roughly crushed and put into a crucible, a melting furnace, or a melting kettle, and 900 to 1500 ° C. (preferably 900 to 1300 ° C., more preferably 900 to 1100 ° C.) At a melting temperature of 30 minutes to 6 hours. It can be obtained by dripping molten glass in the air or pouring and casting into a mold, followed by slow cooling.

  The volatile base compound (B) forms a hydroxyl group and a neutralized salt of the phosphate glass (A), thereby improving the hydratability of the phosphate glass (A) and easily obtaining an aqueous composition. Is a component that makes possible. This volatile base compound (B) is easy to volatilize with moisture when the inorganic aqueous composition is applied to a substrate or the like and dried, so that it does not easily remain in the film, and a film having excellent water resistance is formed. Can be formed.

Examples of the volatile base compound (B) include ammonia and amines.
Examples of amines include allylamine, diallylamine, triallylamine, isopropylamine, diisopropylamine, ethylamine, diethylamine, triethylamine, 2-ethylhexylamine, 3-ethoxypropylamine, disisobutylamine, 3- (diethylamino) propylamine, di-2. -Ethylhexylamine, 3- (dibutylamino) propylamine, tetramethylethylenediamine, t-butylamine, sec-butylamine, propylamine, 3- (methylamino) propylamine, 3- (dimethylamino) propylamine, 3-methoxyamine , Dimethylethanolamine, methyldiethanolamine, diethanolamine, triethanolamine and the like.

  In the present invention, the volatile base compound (B) is preferably ammonia. If it is ammonia, it tends to volatilize when the inorganic aqueous composition is heated and solidified, so that it hardly remains in the coating and has very little effect on water resistance. On the other hand, in the case of amines, particularly high-boiling amines may remain in the coating, so that the organic part of the amines is solidified, for example, in heat-resistant applications or in applications exposed to ultraviolet rays. It may adversely affect the physical properties of the material. Ammonia is preferably used as an aqueous solution from the viewpoint of handleability and the like.

  The volatile base compound (B) is preferably contained in the inorganic aqueous composition in an amount of 100 to 500 parts by mass with respect to 100 parts by mass of the phosphate glass.

  The inorganic aqueous composition of the present invention is a phosphoric acid type such as urea and urea derivatives (hydantoin, etc.) as necessary in addition to the above components, as long as the properties such as incombustibility, heat resistance and weather resistance are not impaired. Other components such as glass precipitation / precipitation inhibitors, water repellents such as silicones, waxes, heavy oil emulsions, colorants, aqueous solutions of various organic resins, and emulsions may be added. The content of these other components is preferably 10% by mass or less, and more preferably 7% by mass or less in the inorganic aqueous composition.

  The inorganic aqueous composition of the present invention preferably contains 0.5 to 40% by mass of phosphate glass (A), and preferably 5 to 30% by mass. If it is less than 0.5% by mass, a film excellent in incombustibility, heat resistance, weather resistance, etc. may not be formed. If it exceeds 40% by mass, the viscosity increases and the coating workability decreases. There is a tendency. For example, in the case where the inorganic aqueous composition is a binder used for inorganic fibers and the like, 0.5 to 2% by mass is preferable, and 0.5 to 1.5% by mass is more preferable. Moreover, when the inorganic aqueous composition is a coating agent used for building materials or the like, 10 to 40% by mass is preferable, and 10 to 30% by mass is more preferable.

  The inorganic aqueous composition of the present invention preferably has a viscosity of 10 to 50 mPa · s, more preferably 10 to 30 mPa · s, measured at 25 ° C., a No. 1 rotor, and 20 rpm. The increase / decrease in the viscosity can be easily adjusted to the above range by adjusting the content of the phosphate glass.

[Method for producing inorganic aqueous composition]
Next, the manufacturing method of the inorganic type aqueous composition of this invention is demonstrated. The manufacturing method of the inorganic aqueous composition of this invention is mixing and manufacturing the said phosphate glass (A) with water (C) in presence of a volatile basic compound (B).

  Specifically, the following methods (1) and (2) are exemplified.

(1) Method of adding phosphate glass (A) and volatile base compound (B) simultaneously and gradually with stirring to water (C) to dissolve phosphate glass (A) (2) ) Dissolve the volatile base compound (B) in water (C) in advance, and then stir the phosphate glass (A) in the mixture of the volatile base compound (B) and water (C). Method of gradually adding and dissolving phosphate glass (A)

  Among the above methods, the method (2) is preferable from the viewpoints of the homogeneity of the inorganic aqueous composition after preparation, the film-forming property after drying, and the like.

  When only the phosphate glass (A) and water (C) are mixed first, hydration occurs on the surface of the phosphate glass (A), and the particles of the phosphate glass (A) adhere to each other, It may become a big lump and time may be required for melt | dissolution of phosphoric acid type glass (A). Moreover, the obtained inorganic aqueous composition tends to have a high viscosity.

  In contrast, by mixing the phosphate glass (A) with water (C) in the presence of the volatile base compound (B), the time required to dissolve the phosphate glass (A) can be shortened. An inorganic aqueous composition having a lower viscosity can be obtained.

  The phosphoric acid glass (A) is preferably pulverized to an average particle size of 1 mm or less, more preferably 100 μm or less. As a result, the time required for melting the phosphate glass (A) can be shortened, and furthermore, the increase in viscosity of the resulting inorganic aqueous composition can be suppressed, so that a lower viscosity inorganic aqueous composition can be efficiently produced. it can. In the present invention, the average particle diameter of the phosphoric acid glass means a value measured by a laser light diffraction method using a laser particle size distribution meter.

  Moreover, when mix | blending the other component mentioned above further, you may add another component when melt | dissolving phosphate glass (A), and after dissolving phosphate glass (A), other components May be added.

  The inorganic aqueous composition of the present invention thus obtained has fluidity, can be easily applied to any shape of substrate, and has good workability. Moreover, since the solidified product after drying and solidifying is a glass having an inorganic polymer chain, a continuous coating without cracks or cracks can be easily formed on the surface of the substrate.

  And, it is preferably used as a binder for inorganic fibers such as glass, carbon, silica, alumina, etc., a porous material, a surface treatment coating agent, etc., and a molded product treated with this inorganic aqueous composition is adiabatic sound absorption. It can be preferably used for architectural uses such as materials and thermal barrier coatings, and various industrial uses such as castable and high temperature furnaces.

  Hereinafter, the present invention will be described in more detail with reference to examples.

Each raw material was mixed and stirred in an excess amount of water so as to have each composition ratio shown in Table 1 below, thereby causing a solid-liquid reaction. The mixture was observed to rise in temperature due to the reaction after stirring. The reaction solution was allowed to stand until the heat of reaction decreased. Thereafter, the reaction solution was left in a dryer at 200 ° C. for 2 to 6 hours to sufficiently remove moisture. The gel product obtained by removing moisture is pulverized to an appropriate size, put into a platinum crucible, melted at 900-1500 ° C. for 2 hours in a melting furnace, and vitrified to prepare a phosphate glass. Then, the obtained phosphoric acid glass of each composition was pulverized to an average particle size of 50 μm. In the composition of Example 11, even when the melting temperature was 1500 ° C., crystallization occurred during vitrification, and phosphoric acid glass could not be obtained.
Next, 100 parts by mass of water was put into a melting apparatus equipped with a stirrer and a dropping device, and 100 parts by mass of the pulverized phosphate glass and 400 parts by mass of aqueous ammonia (25%) were gradually added while stirring. . And stirring was continued until the added phosphate glass melt | dissolved completely, and the inorganic type aqueous composition was manufactured.

The dissolution status, viscosity, and film-forming property of the phosphate glass of the obtained inorganic aqueous composition were evaluated.
The state of dissolution of the phosphate glass was evaluated by visually observing the presence or absence of precipitates after the inorganic aqueous composition was allowed to stand at 40 ° C. for 7 days. The case where there was no precipitate was indicated as “◯”, and the case where a white precipitate was generated was indicated as “x”.
As for the viscosity of the inorganic aqueous composition, the inorganic aqueous composition having a solid content adjusted to 30% was measured with a BL type rotational viscometer at a temperature of 25 ° C. The measurement was performed under the conditions of 1 rotor and 20 rpm.
Regarding the film-forming property of the inorganic aqueous composition, 10 g of the inorganic aqueous composition was dried in a magnetic dish at 180 ° C. for 1 hour and left for 48 hours to confirm the formation of glass. The case where a transparent and thin film was formed was indicated as “◯”, and the case where no film was formed, the case where the film was sticky, or the case where water was dropped to absorb water was indicated as “X”.
Each composition and evaluation results are summarized in Table 1.

From the above results, phosphate glass (A) containing a phosphoric acid component and a Zn component, containing a phosphoric acid component in terms of P ₂ O ₅ and containing no alkali metal component, and a volatile base compound ( The inorganic aqueous compositions of Examples 1 to 7 containing B) and water (C) were able to form a continuous film without cracks or the like. Further, the formed film had no stickiness and the like, had good water resistance, and was excellent in film forming property. Further, the phosphate glass was sufficiently dissolved, precipitates and the like were not easily generated, and the storage stability was excellent. Among them, 45~55mol%, inorganic water-based example 1,3,4,5,7 using phosphate glass (A) containing 20 to 50 mol% of ZnO phosphoric acid component in terms _{of P} 2 _{O 5} The composition had a low viscosity despite its high solid content, and was particularly excellent in coating workability.

On the other hand, the inorganic aqueous composition of Example 8 using phosphoric acid-based glass having a phosphoric acid component content of more than 60 mol% in terms of P ₂ O ₅ has poor water resistance, and the formed film is sticky. The film forming property was inferior.
Moreover, the inorganic aqueous composition of Example 9 using a phosphoric acid-based glass having a phosphoric acid component content of less than 40 mol% in terms of P ₂ O ₅ is difficult to be water-solubilized, and an aqueous composition can be obtained. could not.
In addition, the inorganic aqueous composition of Example 10 using an alkali metal-containing phosphate glass had poor water resistance, and the formed film was sticky and inferior in film forming property.

Claims (6)

A phosphoric acid component and a Zn component, a phosphoric acid component in an amount of 40 to 60 mol% in terms of P ₂ O ₅ , a phosphoric acid-based glass (A) not containing an alkali metal component, a volatile base compound (B), An inorganic aqueous composition comprising water (C). _2. The inorganic aqueous composition according to claim 1, wherein the phosphate glass (A) contains a phosphoric acid component in an amount of 45 to 55 mol% in terms of P ₂ O ₅ and 20 to 50 mol% of ZnO.   The phosphoric acid glass (A) contains at least one selected from Sc component, Ti component, V component, Cr component, Mn component, Fe component, Co component, Cu component, and Ni component in terms of oxide. The inorganic aqueous composition according to claim 1, which is contained in an amount of 1 to 10 mol%.   The inorganic aqueous composition according to any one of claims 1 to 3, wherein the phosphate glass (A) contains 1 to 15 mol% of a polyvalent metal sulfate in terms of sulfate.   The inorganic aqueous composition according to any one of claims 1 to 4, wherein the volatile base compound (B) is ammonia. A method for producing the inorganic aqueous composition according to any one of claims 1 to 5,
A phosphoric acid-based glass (A) containing a phosphoric acid component and a Zn component, containing a phosphoric acid component in terms of P ₂ O ₅ in an amount of 40 to 60 mol%, and not containing an alkali metal component, is obtained from the volatile base compound (B). A method for producing an inorganic aqueous composition, which comprises mixing with water (C) in the presence.