JP2005015324A - Denatured stannic oxide sol, stannic oxide-zirconium oxide multiple sol, and production method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide sol used for the component of a hard coat agent applied to the surface of a plastic lens or for the other use, and to provide its production method. <P>SOLUTION: The sol contains denatured metal oxide particles of stannic oxide particles or the multiple particles of stannic oxide particles and zirconium oxide particles with a particle diameter of 4.5 to 60 nm. As for these oxides, with colloidal particles (A) having a ratio of 0:1 to 0.50:1 as ZrO<SB>2</SB>:SnO<SB>2</SB>and a particle diameter of 4 to 50 nm as nuclei, the surfaces are coated with (B1) alkylamine-containing Sb<SB>2</SB>O<SB>5</SB>colloidal particles, the oligomer thereof or the mixture thereof, or with (B2) the blended colloidal particles of antimony pentoxide and silica, the oligomer thereof or the mixture thereof, also, the weight ratio of (B)/(A) is 0.01 to 0.50 based on the weight ratio of these metal oxides. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to particles formed by coating the surface of a tin oxide colloid or a stannic oxide-zirconium oxide composite colloid with alkylamine-containing Sb ₂ O ₅ colloidal particles or antimony pentoxide and silica composite colloidal particles. The present invention relates to a sol of modified stannic oxide having a diameter of 4.5 to 60 nm or modified stannic oxide-zirconium oxide colloidal particles, and a method for producing the sol.

  The sol of the present invention is used for various other applications as a component of a hard coat agent applied to the surface of a plastic lens.

  In order to improve the surface of a plastic lens that has been frequently used in recent years, a metal oxide sol having a high refractive index is used as a component of a hard coat agent applied to the surface.

  A hard coating agent containing 1 to 300 nm particles of a metal oxide such as Al, Ti, Zr, Sn, and Sb is described (see, for example, Patent Document 1).

A stable sol of tungsten oxide alone is not yet known, but WO ₃ : SiO ₂ : M ₂ O (where M represents an alkali metal atom or an ammonium group) obtained by addition of silicate has a molar ratio of 4. Sols that are ˜15: 2 to 5: 1 have been proposed (see, for example, Patent Document 2).

  A silicic acid-stannic acid composite sol having a Si: Sn molar ratio of 2 to 1000: 1 has been proposed (see, for example, Patent Document 3).

The surface is a WO ₃ / SnO ₂ weight ratio of 0.5 to 100 and a particle diameter of 2 to 7 nm using a colloidal particle of a metal oxide of valence 3, 4, or 5 having a particle diameter of 4 to 50 nm as a nucleus. It is composed of a modified metal oxide colloid having a particle diameter of 4.5 to 60 nm formed by coating with colloidal particles of a tungsten oxide-stannic oxide composite, and contains 2 to 50% by weight of these total metal oxides A stable sol has been proposed (see, for example, Patent Document 4).

The _SnO 2 -ZrO ₂ composite colloidal particles having a particle diameter of a weight ratio and 4~50nm of ZrO ₂ / SnO ₂ as 0.02 to 1.0 as a nucleus, the surface, WO ₃ of 0.5 to 100 A stable sol of modified SnO ₂ —ZrO ₂ composite comprising particles of a structure coated with a WO ₃ —SnO ₂ composite colloidal particle having a / SnO ₂ weight ratio and a particle size of ₂ to 7 nm has been proposed ( For example, see Patent Document 5).

A particle (C) obtained by coating the surface of a metal oxide colloidal particle (A) having a primary particle size of 2 to 60 nm with a coating (B) comprising colloidal particles of an acidic oxide. There is disclosed a stable modified metal oxide sol containing and containing (C) in a proportion of 2 to 50% by weight in terms of metal oxide and having a primary particle size of 2 to 100 nm. The core metal oxide is SnO ₂ particles and SnO ₂ —ZrO ₂ composite colloidal particles, and the coating contains alkylamine-containing Sb ₂ O ₅ particles (M / Sb ₂ O ₅ molar ratio is 0.02-4. 00) is disclosed (see, for example, Patent Document 6).

  After mixing an alkali silicate aqueous solution or silicate sol solution with an alkali antimonate aqueous solution or an alkali stannate aqueous solution so that the molar ratio of Si: Sb or Si: Sn is 2 to 1000: 1, the mixture is A method for producing a silicic acid-antimonic acid composite sol solution or a silicic acid-stannic acid composite sol solution characterized by decationization with an acid ion exchanger is described (for example, Patent Document 7).

A silica antimony oxide composite sol is described in which antimony oxide colloidal particles containing 0.1 to 50% by weight of an inorganic silicate compound as SiO ₂ are dispersed in a dispersion medium (for example, Patent Document 8).
Japanese Patent Publication No. 63-37142 (Claims) JP 54-52686 A (Claims) Japanese Patent Publication No. 50-40119 (Claims) JP-A-3-217230 (Claims) JP-A-6-24746 (Claims) JP 2001-122621 (Claims) Japanese Patent Publication No. 50-40119 (Claims) Japanese Patent Publication No. 7-25549 (Claims)

When conventional metal oxide sols, especially cationic metal oxide sols, are used as components of the hard coating agent, not only the stability of the obtained hard coating agent is not sufficient, but also the cured film of this hard coating agent is transparent. Property, adhesion, weather resistance and the like are not sufficient. When Sb ₂ O ₅ sol is used as a hard coating agent component, the refractive index of Sb ₂ O ₅ is about 1.65 to 1.70, so the refractive index of the plastic substrate of the lens is 1.6 or more. In this case, the refractive index of the cured film is no longer sufficiently improved with this Sb ₂ O ₅ sol.

  The tungsten oxide sol described in JP-A-54-52686 is obtained by adding silicate to an aqueous solution of tungstic acid obtained by decation treatment of an aqueous solution of tungstate. When used as a component of a hard coating agent, the effect of improving the refractive index of the coating film is small.

  The silicic acid-stannic acid composite sol described in Japanese Patent Publication No. 50-40119 is obtained by decation treatment of a mixed aqueous solution of alkali silicate and alkali stannate. When used as a component of the agent, the effect of improving the refractive index of the coating film is small.

  The modified metal oxide sol described in JP-A-3-217230 has a refractive index of 1.7 or more, is stable, can be used as a component of a hard coating agent for plastic lenses, and requires a required hard coat. The film performance such as scratch resistance, transparency, adhesion, water resistance, weather resistance and the like can be substantially satisfied.

  The modified stannic oxide-zirconium oxide sol described in JP-A-6-24746 is stable with a refractive index of 1.7 or more, and can be used as a component of a hard coating agent for plastic lenses. The performance of the hard coat film, such as scratch resistance, transparency and adhesion, can be substantially satisfied.

  The present invention is a state when the modified metal oxide described in JP-A-3-217230 and JP-A-6-24746 is used as a hard coat film, for example, scratch resistance, transparency, adhesion, water resistance, A sol for further improving weather resistance and the like, which is a stable sol of modified stannic oxide or modified stannic oxide-zirconium oxide that is stable in a wide pH range, and is applied to the surface of a plastic lens. An object of the present invention is to provide a metal oxide sol that can be used as a component for improving the performance of a hard coat film mixed with the hard coat paint.

The present invention is, as a first aspect, stannic oxide particles or composite particles of stannic oxide particles and zirconium oxide particles, and these oxides are expressed as 0: 1 to ZrO ₂ : SnO ₂ based on weight. Colloidal particles (A) having a ratio of 0.50: 1 and a particle size of 4 to 50 nm as the core, the surface has a molar ratio of M / Sb ₂ O ₅ of 0.02 to 4.00 (where M is an amine) And a mixture of (B1) with an alkylamine-containing Sb ₂ O ₅ colloidal particle, oligomer or mixture thereof having a weight ratio of (B1) / (A) A sol containing modified metal oxide particles having a particle size of 4.5 to 60 nm in a proportion of 0.01 to 0.50, based on
As a second aspect, the sol according to the first aspect, in which the colloidal particles (A) are stannic oxide,
As a third aspect, the colloidal particles (A) are composite colloidal particles of stannic oxide particles and zirconium oxide particles having a ZrO ₂ : SnO ₂ weight ratio of 0.05: 1 to 0.50: 1. The sol according to one aspect,
A fourth aspect is stannic oxide particles or composite particles of stannic oxide particles and zirconium oxide particles, and these oxides are 0: 1 to 0.50 as ZrO ₂ : SnO ₂ based on weight. 1: A composite of antimony pentoxide and silica having colloidal particles (A) having a ratio of 1 and a particle diameter of 4 to 50 nm as a core and a SiO ₂ / Sb ₂ O ₅ molar ratio of 0.55 to 55 on the surface Coated with colloidal particles, oligomers thereof or mixtures thereof (B2), and the weight ratio of (B2) / (A) is a ratio of 0.01 to 0.50 based on the weight ratio of the metal oxides And a sol containing modified metal oxide particles having a particle size of 4.5-60 nm,
As a fifth aspect, the sol according to the fourth aspect, in which the colloidal particles (A) are stannic oxide,
As a sixth aspect, the colloidal particles (A) are composite colloidal particles of stannic oxide particles and zirconium oxide particles having a ZrO ₂ : SnO ₂ weight ratio of 0.05: 1 to 0.50: 1. The sol according to 4 viewpoints,
As a 7th viewpoint, the following (a1) process, (b1) process, and (c1) process:
(A1) Step: Adjusting a stannic oxide aqueous sol containing colloidal particles of stannic oxide having a particle diameter of 4 to 50 nm as SnO _{2 at} a concentration of 1 to 50% by weight;
Step (b1): The molar ratio of the stannic oxide aqueous sol obtained in Step (a1) to M / Sb ₂ O ₅ of 0.02 to 4.00 (where M represents an amine molecule). The alkylamine-containing Sb ₂ O ₅ colloidal particles, the oligomer thereof, or the aqueous medium containing the mixture thereof having a weight ratio of Sb ₂ O ₅ / SnO ₂ in terms of the metal oxide is 0.01 to 0.00. 50, and (c1) step: The aqueous medium obtained in step (b1) is aged at 20 to 300 ° C. for 0.1 to 50 hours, according to the first aspect or the second aspect. A method for producing a stable sol of modified stannic oxide colloidal particles,
As an eighth aspect, the following step (a2), step (b2), step (c2) and step (d2):
Step (a2): a stannic oxide aqueous sol having a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight, and an oxyzirconium concentration of 0.5 to 50% by weight in terms of ZrO ₂ An aqueous salt solution was mixed in a weight ratio of 0.05 to 0.50 as ZrO ₂ / SnO ₂ , and the resulting mixture was heated at 60 to 100 ° C. for 0.1 to 50 hours to give 4 Preparing a stannic oxide-zirconium oxide composite aqueous sol having a particle diameter of ˜50 nm;
Step (b2): Molar ratio of stannic oxide-zirconium oxide composite aqueous sol obtained in step (a2) and M / Sb ₂ O ₅ of 0.02 to 4.00 (where M is an amine molecule) The weight of Sb ₂ O ₅ / (SnO ₂ + ZrO ₂ ) in terms of the metal oxide of the aqueous medium containing the alkylamine-containing Sb ₂ O ₅ colloidal particles, oligomers thereof, or mixtures thereof having Mixing at a ratio of 0.01 to 0.50,
(C2) step: a step of aging the aqueous medium obtained in step (b2) at 20 to 300 ° C. for 0.1 to 50 hours; and
Step (d2): A step of removing anions present in the sol by contacting the modified stannic oxide-zirconium oxide composite aqueous sol obtained in step (c2) with an anion exchanger. A method for producing a stable sol of the modified stannic oxide-zirconium oxide composite colloidal particles according to the first aspect or the third aspect,
As a 9th viewpoint, the following (a3) process, (b3) process, and (c3) process:
(A3) step: a step of adjusting a stannic oxide aqueous sol that is hydrothermally treated at a temperature of 100 to 300 ° C. and has a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight;
Step (b3): The molar ratio of the stannic oxide aqueous sol obtained in Step (a3) above to M / Sb ₂ O ₅ of 0.02 to 4.00 (where M represents an amine molecule). The alkylamine-containing Sb ₂ O ₅ colloidal particles, the oligomer thereof, or the aqueous medium containing the mixture thereof having a weight ratio of Sb ₂ O ₅ / SnO ₂ in terms of the metal oxide is 0.01 to 0.00. 50, and (c3) step: The aqueous medium obtained in step (b3) is aged at 20 to 300 ° C. for 0.1 to 50 hours, according to the first aspect or the second aspect. A method for producing a stable sol of modified stannic oxide colloidal particles,
As a tenth aspect, the following step (a4), step (b4), step (c4) and step (d4):
(A4) Step: Hydrothermally treated at a temperature of 100 to 300 ° C., converted into ZrO ₂ , and a stannic oxide aqueous sol having a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight. And an aqueous solution of an oxyzirconium salt having a concentration of 0.5 to 50% by weight as ZrO ₂ / SnO ₂ in a weight ratio of 0.05 to 0.50, and the resulting mixture at 60 to 100 ° C. A step of preparing a stannic oxide-zirconium oxide composite aqueous sol having a particle size of 4 to 50 nm by heating for 0.1 to 50 hours;
Step (b4): A molar ratio of the stannic oxide-zirconium oxide composite aqueous sol obtained in Step (a4) and M / Sb ₂ O ₅ of 0.02 to 4.00 (where M is an amine molecule) The weight of Sb ₂ O ₅ / (SnO ₂ + ZrO ₂ ) in terms of the metal oxide of the aqueous medium containing the alkylamine-containing Sb ₂ O ₅ colloidal particles, oligomers thereof, or mixtures thereof having Mixing at a ratio of 0.01 to 0.50,
(C4) step: a step of aging the aqueous medium obtained in step (b4) at 20 to 300 ° C. for 0.1 to 50 hours; and
Step (d4): A step of removing anions present in the sol by bringing the modified stannic oxide-zirconium oxide composite aqueous sol obtained in step (c4) into contact with an anion exchanger. A method for producing a stable sol of the modified stannic oxide-zirconium oxide composite colloidal particles according to the first aspect or the third aspect,
As an eleventh aspect, the following step (a5), step (b5), and step (c5):
(A5) Step: Adjusting a stannic oxide aqueous sol containing colloidal particles of stannic oxide having a particle diameter of 4 to 50 nm as SnO _{2 at} a concentration of 1 to 50% by weight;
(B5) step: a composite colloidal particle of antimony pentoxide and silica having a molar ratio of stannic oxide aqueous sol obtained in step (a5) and SiO ₂ / Sb ₂ O ₅ of 0.55 to 55, A step of mixing the oligomer or an aqueous medium containing a mixture thereof in a weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / (SnO ₂ ) in terms of the metal oxide to 0.01 to 0.50. And the step (c5): the step of aging the aqueous medium obtained in the step (b5) at 20 to 300 ° C. for 0.1 to 50 hours, the modified oxidized film according to the fourth aspect or the fifth aspect A method for producing a stable sol of colloidal tin particles,
As a twelfth aspect, the following step (a6), step (b6), step (c6) and step (d6):
Step (a6): a stannic oxide aqueous sol having a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight, and an oxyzirconium concentration of 0.5 to 50% by weight in terms of ZrO ₂ An aqueous salt solution was mixed in a weight ratio of 0.05 to 0.50 as ZrO ₂ / SnO ₂ , and the resulting mixture was heated at 60 to 100 ° C. for 0.1 to 50 hours to give 4 Preparing a stannic oxide-zirconium oxide composite aqueous sol having a particle diameter of ˜50 nm;
(B6) step: (a6) stannic oxide obtained in step - zirconium oxide composite aqueous sol, the diantimony pentaoxide and silica having a molar ratio of _SiO 2 / _Sb 2 _{O 5} of 0.55 to 55 The aqueous medium containing the composite colloidal particles, the oligomer thereof, or the mixture thereof is 0.01 to 0 by weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / (SnO ₂ + ZrO ₂ ) in terms of the metal oxide. Mixing to 50;
Step (c6): Step of aging the aqueous medium obtained in Step (b6) at 20 to 300 ° C. for 0.1 to 50 hours, and
Step (d6): A step of removing anions present in the sol by bringing the modified stannic oxide-zirconium oxide composite aqueous sol obtained in step (c6) into contact with an anion exchanger. A method for producing a stable sol of the modified stannic oxide-zirconium oxide composite colloidal particles according to the fourth aspect or the sixth aspect,
As a thirteenth aspect, the following step (a7), step (b7), and step (c7):
(A7) Step: Adjusting a stannic oxide aqueous sol that is hydrothermally treated at a temperature of 100 to 300 ° C. and has a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight;
Step (b7): a composite colloidal particle of antimony pentoxide and silica having a molar ratio of stannic oxide aqueous sol obtained in the step (a7) and SiO ₂ / Sb ₂ O ₅ of 0.55 to 55, A step of mixing the oligomer or an aqueous medium containing a mixture thereof in a weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / (SnO ₂ ) in terms of the metal oxide to 0.01 to 0.50. And the step (c7): the step of aging the aqueous medium obtained in the step (b7) at 20 to 300 ° C. for 0.1 to 50 hours, the modified oxidized film according to the fourth aspect or the fifth aspect A method for producing a stable sol of colloidal tin particles,
As a 14th viewpoint, the following (a8) process, (b8) process, (c8) process, and (d8) process:
Step (a8): hydrothermally treated at a temperature of 100 to 300 ° C., converted into ZrO ₂ , and a stannic oxide aqueous sol having a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight. And an aqueous solution of an oxyzirconium salt having a concentration of 0.5 to 50% by weight as ZrO ₂ / SnO ₂ in a weight ratio of 0.05 to 0.50, and the resulting mixture at 60 to 100 ° C. A step of preparing a stannic oxide-zirconium oxide composite aqueous sol having a particle size of 4 to 50 nm by heating for 0.1 to 50 hours;
(B8) step: (a8) stannic oxide obtained in step - zirconium oxide composite aqueous sol, the diantimony pentaoxide and silica having a molar ratio of _SiO 2 / _Sb 2 _{O 5} of 0.55 to 55 The aqueous medium containing the composite colloidal particles, the oligomer thereof, or the mixture thereof is 0.01 to 0 by weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / (SnO ₂ + ZrO ₂ ) in terms of the metal oxide. Mixing to 50;
(C8) step: a step of aging the aqueous medium obtained in step (b8) at 20 to 300 ° C. for 0.1 to 50 hours; and
Step (d8): A step of removing anions present in the sol by bringing the modified stannic oxide-zirconium oxide composite aqueous sol obtained in step (c8) into contact with an anion exchanger. , A method for producing a stable sol of modified stannic oxide-zirconium oxide composite colloidal particles according to the fourth aspect or the sixth aspect.

  The present invention relates to the action of an antimonic acid alkali salt, an alkali component-containing antimony pentoxide colloid and its oligomer, a coating obtained by adding a silica component thereto, and an antimony pentoxide-silica composite colloid, its oligomer, or a mixture thereof. Thus, it is possible to improve various disadvantages (dispersibility, weather resistance, long-term stability, compatibility with hard coat agents, bonding properties) of conventional metal oxide colloids, and to obtain excellent modified metal oxides Can do. When the modified stannic oxide and / or stannic oxide-zirconium oxide composite colloid of the present invention is used as a hard coating agent component, yellowing caused by ultraviolet irradiation, which is observed when a conventional metal oxide sol is used, The problems of film hardness, water resistance, moisture resistance and compatibility can be overcome.

  The object of the present invention is to provide a stable sol of modified metal oxide colloidal particles having good water resistance and weather resistance, and the hard coat as a component for improving the performance of a hard coat film applied to the surface of a plastic lens. An object of the present invention is to provide a sol that can be mixed with a paint for use.

  The sol of the surface-modified metal oxide colloidal particles obtained by the present invention is colorless and transparent, and the refractive index calculated from the dried coating film is about 1.75 to 1.92. All of them are high, and weather resistance, antistatic properties, heat resistance, wear resistance and the like are also good. In particular, weather resistance and moisture resistance are remarkably improved as compared with the conventional one.

  This sol is stable at a pH of 1 to 11, preferably 1.5 to 10, and can also provide sufficient stability to be supplied as an industrial product.

  Since the colloidal particles are negatively charged, this sol has good miscibility with other negatively charged colloidal particles such as silica sol, antimony pentoxide sol, anionic or nonionic. Surfactant, aqueous solution such as polyvinyl alcohol, anionic or nonionic resin emulsion, water glass, aqueous solution such as aluminum phosphate, hydrolyzed solution of ethyl silicate, silane coupling agent such as γ-glycidoxytrimethoxysilane or It can be stably mixed with the hydrolyzed solution.

  The sol of the present invention having such properties has a refractive index, dyeability, chemical resistance, water resistance, moisture resistance, light resistance, weather resistance, abrasion resistance, etc. for forming a hard coat film on a plastic lens. It is particularly effective as an improving component, but can be used for various other purposes.

  By applying this sol to the surface of organic fibers, fiber products, paper, etc., the flame retardancy, anti-slip property, antistatic property, dyeability and the like of these materials can be improved. Moreover, these sols can be used as binders for ceramic fibers, glass fibers, ceramics, and the like. Furthermore, by mixing and using in various paints, various adhesives, etc., the water resistance, chemical resistance, light resistance, weather resistance, abrasion resistance, flame resistance, etc. of those cured coating films can be improved. . In addition, these sols can generally be used as surface treatment agents for metal materials, ceramic materials, glass materials, plastic materials and the like. Further, it is useful as a catalyst component.

The present invention is stannic oxide particles or composite particles of stannic oxide particles and zirconium oxide particles, and these oxides are 0: 1 to 0.50 as ZrO ₂ : SnO ₂ based on weight. Colloidal particles (A) having a ratio of 1 and a particle diameter of 4 to 50 nm as the core, the surface has a molar ratio of M / Sb ₂ O ₅ of 0.02 to 4.00 (where M represents an amine molecule). ) -Coated alkylamine-containing Sb ₂ O ₅ colloidal particles, oligomers thereof, or mixtures thereof (B1), and the weight ratio of (B1) / (A) is 0 based on the weight ratio of the metal oxides A sol containing modified metal oxide particles in a ratio of 0.01 to 0.50 and having a particle size of 4.5 to 60 nm.

Moreover, a composite particle with stannic oxide particles or stannic oxide particles and zirconium oxide particles, _ZrO 2 and these oxides based on the weight: SnO ₂ 0: 1 to 0.50: 1 A colloidal particle (A) having a ratio and a particle diameter of 4 to 50 nm as a nucleus, a composite colloidal particle of antimony pentoxide and silica whose surface has a SiO ₂ / Sb ₂ O ₅ molar ratio of 0.55 to 55, Coated with the oligomer, or a mixture thereof (B2), and the weight ratio of (B2) / (A) is from 0.01 to 0.50 based on the weight ratio of the metal oxides, and 4 A sol containing modified metal oxide particles having a particle size of 5 to 60 nm.

  The particle diameter in the sol is represented by the particle diameter by electron microscope observation.

  The colloidal particles of stannic oxide as the core particles (A) used for the production of the sol of the present invention are about 4 to 4 by a known method, for example, a method called ion exchange method, peptization method, hydrolysis method, reaction method or the like. It can be easily prepared in the form of a sol of colloidal particles having a particle diameter of about 50 nm.

  Examples of the ion exchange method include a method of treating a stannate such as sodium stannate with a hydrogen cation exchange resin, or a stannic salt such as stannic chloride and stannic nitrate. The method of processing with a type | mold anion exchange resin is mentioned. Examples of the peptization method include neutralizing stannic salt with a base or washing stannic hydroxide gel obtained by neutralizing stannic acid with hydrochloric acid, and then peptizing with acid or base. The method of doing is mentioned. Examples of the hydrolysis method include a method of hydrolyzing tin alkoxide or a method of removing an unnecessary acid after hydrolysis of a basic stannic chloride basic salt under heating. Examples of the reaction method include a method of reacting metal tin powder with an acid.

  The aqueous stannic oxide sol produced by the above method can be used as it is, but can also be used after hydrothermal treatment at a temperature of 100 to 300 ° C.

  In the hydrothermal treatment, for example, the above stannic oxide aqueous sol is placed in an autoclave and treated at a temperature of 100 to 300 ° C. for 0.1 to 200 hours.

  The medium of these stannic oxide sols may be either water or a hydrophilic organic solvent, but an aqueous sol in which the medium is water is preferable. The pH of the sol is good for stabilizing the sol, and is usually about 0.2 to 11.5. As long as the object of the present invention is achieved, the stannic oxide sol may contain an optional component, for example, an alkaline substance, an acidic substance, an oxycarboxylic acid and the like for stabilizing the sol. The concentration of the stannic oxide sol used is about 0.5 to 50% by weight as stannic oxide, but this concentration should be low, and preferably 1 to 30% by weight.

In the stannic oxide-zirconium oxide composite sol as the core particle (A) used for the production of the sol of the present invention, an oxyzirconium salt is added to the stannic oxide sol with a ZrO ₂ / SnO ₂ weight ratio of 0.05 to 0. And 0.5 to 3 hours at 5 to 100 ° C., and then heated at 60 to 100 ° C. for 0.1 to 50 hours.

  As the stannic oxide sol used here, either a sol that has been subjected to hydrothermal treatment in advance or a sol that has not been subjected to hydrothermal treatment can be used.

Examples of the oxyzirconium salt used include zirconium oxychloride, zirconium oxynitrate, zirconium oxysulfate, zirconium oxyacetate, zirconium oxyorganic acid, zirconium oxycarbonate, and the like. These oxyzirconium salts can be used as a solid or an aqueous solution, but are preferably used as an aqueous solution of 0.5 to 50% by weight, preferably about 0.5 to 30% by weight as ZrO ₂ . Even a salt insoluble in water, such as zirconyl oxycarbonate, can be used when stannic oxide is an acidic sol.

  As the stannic oxide sol, it is particularly preferable to use an alkaline sol stabilized with an organic base such as an amine, and mixing with the oxyzirconium salt is preferably 5 to 100 ° C., preferably room temperature (20 ° C.) to 60 ° C. . In this mixing, the oxyzirconium salt may be added to the stannic oxide sol under stirring, or the stannic oxide sol may be added to the aqueous oxyzirconium salt solution, but the latter is preferred. This mixing needs to be carried out sufficiently and is preferably 0.5 to 3 hours.

  The alkylamine-containing antimony pentoxide colloid, its oligomer, or a mixture (B1) used as the coating sol of the present invention can be obtained by the following methods (oxidation method, acid decomposition method, etc.). Examples of the acid decomposition method include a method in which an alkali antimonate is reacted with an inorganic acid and then peptized with an amine (JP 60-41536 A, JP 61-227918 A, JP 2001-123115 A), oxidation Examples of the method and a method of oxidizing antimony trioxide with hydrogen peroxide in the coexistence of an amine or an alkali metal (Japanese Patent Publication No. 57-11848, Japanese Patent Laid-Open No. 59-232921) or antimony trioxide oxidized with hydrogen peroxide Then, it can obtain by the method of adding an amine or an alkali metal.

Examples of amines in the above amine-containing antimony pentoxide colloid, oligomers thereof, or mixtures thereof include ammonium, quaternary ammonium, and water-soluble amines. Preferred examples of these include alkylamines such as isopropylamine, diisopropylamine, n-propylamine and diisobutylamine, aralkylamines such as benzylamine, alicyclic amines such as piperidine, alkanolamines such as monoethanolamine and triethanolamine. And quaternary ammonium such as tetramethylammonium hydroxide. Particularly preferred are diisopropylamine and diisobutylamine. The molar ratio of the alkali component to the antimony pentoxide in the amine-containing antimony pentoxide colloid is preferably 0.02 to 4.00 for M / Sb ₂ O ₅ , and if it is less than this, the stability of the obtained colloid is poor. On the other hand, if the amount is too large, the water resistance of the dried coating film obtained using such a sol is lowered, which is not practically preferable.

The amine-containing antimony pentoxide colloidal particles, oligomers thereof, or a mixture thereof (B1) are fine antimony pentoxide colloidal particles, oligomers thereof, or a mixture thereof. As for the colloidal particles, particles of 20 nm or less were observed by electron microscope observation. The oligomer is a polymer and cannot be observed with an electron microscope. In the present invention, the colloidal particles (A) have a particle diameter of 4 to 50 nm, and the metal oxide particles modified by coating (B1) have a diameter of 4.5 to 60 nm. This increase in particle size causes the negatively charged (B1) colloidal particles, their oligomers, or mixtures thereof to chemically bond on the surface of the positively charged colloidal particles (A) and thereby be coated. It is a thing.
An alkylamine salt such as diisopropylamine is preferable as the amine component, and the amine / Sb2O5 molar ratio is 0.02 to 4.00.

  In the above-mentioned coating, alkylamine-containing silica particles can be further added to the amine-containing antimony pentoxide colloidal particles, oligomers thereof, or mixtures thereof.

  A composite colloid of antimony pentoxide and silica, an oligomer thereof, or a mixture thereof (B2) used as the coating sol of the present invention can be obtained by a known method shown below (for example, Japanese Patent Publication No. 50-40119). . That is, it can be obtained by mixing an alkali silicate aqueous solution or silicate sol solution with an alkali antimonate aqueous solution and then decationizing with a cation exchange resin.

As the antimony raw material, a potassium antimonate aqueous solution can be preferably used. As the silica raw material, sodium silicate, potassium silicate, and activated silicic acid obtained by cation exchange thereof can be used. The molar ratio of SiO ₂ / _Sb 2 _{O 5} is from 0.55 to 55.

  The complex colloid of antimony pentoxide and silica, an oligomer thereof, or a mixture thereof (B2) is a fine colloid of antimony pentoxide and silica, an oligomer thereof, or a mixture thereof. As for the colloidal particles, particles of 5 nm or less were observed by observation with an electron microscope. The oligomer is a polymer and cannot be observed with an electron microscope. In the present invention, the colloidal particles (A) have a particle diameter of 4 to 50 nm, and the metal oxide particles modified by coating (B2) have a diameter of 4.5 to 60 nm. This increase in particle size is due to the negatively charged (B2) colloidal particles of antimony pentoxide and silica, their oligomers, or mixtures thereof chemically bonded to the surface of the positively charged colloidal particles (A). Produced and covered by it.

Modified stannic oxide or modified stannic oxide-zirconium oxide composite colloidal particles surface coated with amine-containing Sb ₂ O ₅ colloid (B1) according to the present invention are negatively charged in the sol .

The stannic oxide-zirconium oxide composite colloidal particles are positively charged, and the Sb ₂ O ₅ colloid is negatively charged. Therefore, the negatively charged colloid of Sb ₂ O ₅ is electrically attracted around the positively charged stannic oxide-zirconium oxide composite colloidal particles by mixing, and the positively charged colloidal particle surface The Sb ₂ O ₅ colloid is bonded by chemical bonding, and the positively charged particles are used as nuclei to cover the surface with negatively charged Sb ₂ O _5, thereby modifying the modified stannic oxide-oxidation. It is considered that zirconium composite colloidal particles were generated.

However, a stannic oxide-zirconium oxide composite colloidal particle having a particle diameter of 4 to 50 nm as a core sol and an amine-containing Sb ₂ O ₅ colloid, an oligomer thereof, or a mixture thereof (B1) as a coating sol are mixed. Sometimes, if the amount of the metal oxide in the coating sol is less than 1 part by weight with respect to 100 parts by weight of the metal oxide (SnO ₂ or ZrO ₂ + SnO ₂ ) in the core sol, a stable sol cannot be obtained. This is because when the amount of colloid of Sb ₂ O ₅ is insufficient, the surface of the composite colloidal particles with the stannic oxide-zirconium oxide composite colloidal particles as the core is insufficient, and the resulting colloidal particles It is thought that the agglomeration of the sol tends to occur and the sol formed becomes unstable. Therefore, the amount of Sb ₂ O ₅ colloidal particles and oligomers to be mixed may be less than the amount covering the entire surface of the stannic oxide-zirconium oxide composite colloidal particles, but stable modified stannic oxide. -The amount is more than the minimum amount necessary to form a sol of zirconium oxide composite colloidal particles. When the amount of Sb ₂ O ₅ colloidal particles and the oligomer thereof exceeding the amount used for the surface coating is used for the above mixing, the resulting sol contains Sb ₂ O ₅ colloid, the oligomer, or a mixture thereof. And a stable mixed sol of the resulting aqueous medium and the resulting modified stannic oxide-zirconium oxide composite colloidal particle sol.

Preferably, to modify the stannic oxide-zirconium oxide composite colloidal particle by its surface coating, the amount of Sb ₂ O ₅ colloid, its oligomer, or mixture thereof (B1) used is the metal of the core sol 50 parts by weight or less is preferable as the metal oxide in the coating sol with respect to 100 parts by weight of the oxide (SnO ₂ or ZrO ₂ + SnO ₂ ).

  Modified stannic oxide or modified stannic oxide-zirconium oxide composite colloidal particles whose surface is coated with a composite colloid of antimony pentoxide and silica, an oligomer thereof, or a mixture thereof (B2) according to the present invention are: It is negatively charged in the sol.

  The stannic oxide-zirconium oxide composite colloidal particles are positively charged, and the composite colloid of antimony pentoxide and silica is negatively charged. Therefore, the positively charged stannic oxide-zirconium oxide composite colloidal particles are electrically attracted around the positively charged stannic oxide-zirconium oxide composite colloidal particles, and the positively charged colloid The antimony pentoxide / silica composite colloid binds to the particle surface by chemical bonding, and the positively charged particle serves as a nucleus to cover the surface with the negatively charged antimony pentoxide / silica composite colloid. It is thought that the produced stannic oxide-zirconium oxide composite colloidal particles were produced.

However, a stannic oxide-zirconium oxide composite colloidal particle having a particle diameter of 4 to 50 nm as a core sol and an antimony pentoxide / silica composite colloid, an oligomer thereof, or a mixture thereof (B2) as a coating sol are mixed. When the amount of the metal oxide of the coating sol is less than 1 part by weight with respect to 100 parts by weight of the metal oxide (SnO ₂ or ZrO ₂ + SnO ₂ ) of the core sol, a stable sol cannot be obtained. This means that when the amount of the composite colloid of antimony pentoxide and silica is insufficient, the surface of the composite colloidal particles with the stannic oxide-zirconium oxide composite colloidal particles as the core becomes insufficient, Aggregation of colloidal particles is likely to occur, and it is thought that the generated sol is unstable. Therefore, the amount of antimony pentoxide and silica composite colloidal particles, oligomers thereof, or mixtures thereof to be mixed may be less than the amount covering the entire surface of the stannic oxide-zirconium oxide composite colloidal particles, but stable. The amount of the modified stannic oxide-zirconium oxide composite colloidal particles is not less than the minimum amount necessary to form a sol. When an amount of antimony pentoxide / silica composite colloidal particles, an oligomer thereof, or a mixture thereof exceeding the amount used for the surface coating is used in the above mixing, the resulting sol is a composite of antimony pentoxide and silica. It is only a stable mixed sol of an aqueous medium containing a colloid, an oligomer thereof, or a mixture thereof and a sol of the resulting modified stannic oxide-zirconium oxide composite colloidal particles.

Preferably, to modify the stannic oxide-zirconium oxide composite colloidal particles by its surface coating, the amount of antimony pentoxide and silica composite colloid, oligomer thereof, or mixture thereof (B2) used is The metal oxide in the coating sol is preferably 50 parts by weight or less with respect to 100 parts by weight of the metal oxide (SnO ₂ or ZrO ₂ + SnO ₂ ).

In the present invention, when stannic oxide is used for the nucleus, step (a1): a stannic oxide colloidal particle having a particle diameter of 4 to 50 nm is contained as SnO _{2 in} a concentration of 1 to 50% by weight. Step of adjusting aqueous tin sol, (b1) step: Molar ratio of stannic oxide aqueous sol obtained in step (a1) above and M / Sb ₂ O ₅ of 0.02 to 4.00 (however, M represents an amine molecule.) The weight of Sb ₂ O ₅ / SnO ₂ converted to the metal oxide of an aqueous medium containing an alkylamine-containing Sb ₂ O ₅ colloid, oligomer thereof, or a mixture thereof. The step of mixing 0.01 to 0.50 at a ratio, (c1) step: modified from the step of aging the aqueous medium obtained in step (b1) at 20 to 300 ° C. for 0.1 to 50 hours Stannic oxide colloidal particles Stable sol is obtained. In the sol obtained in the step (c1), when the stannic oxide sol in the step (a1) contains an anion, the step (d1) can be added. That is, step (d1): The anion present in the sol is removed by contacting the modified stannic oxide aqueous sol obtained in step (c1) with an anion exchanger, and then 20 to 20 A stable sol of modified stannic oxide colloidal particles is obtained by adding a step of aging at 300 ° C. for 0.1 to 50 hours. Aging at 100 ° C. or higher can be performed using an autoclave. This sol has a molar ratio of M / Sb ₂ O ₅ of 0.02 to 4.00 (where M is an amine molecule) with stannic oxide colloidal particles (A) having a particle diameter of 4 to 50 nm as nuclei. Is coated with alkylamine-containing Sb ₂ O ₅ colloidal particles, oligomers thereof, or mixtures thereof (B1), and the weight ratio of (B1) / (A) is the weight ratio of the metal oxides A sol containing modified stannic oxide particles having a particle size of 4.5 to 60 nm, based on a ratio of 0.01 to 0.50.

In the present invention, when colloidal particles of stannic oxide and zirconium oxide are used for the core, the step (a2): oxidation step having a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight. two tin aqueous sol, an aqueous solution of oxyzirconium salt 0.5 to 50% strength by weight in terms of ZrO _2, were mixed in a weight ratio of ZrO 2 / SnO ₂ as 0.05 to 0.50, obtained A step of preparing a stannic oxide-zirconium oxide composite aqueous sol having a particle size of 4 to 50 nm by heating the obtained mixed solution at 60 to 100 ° C. for 0.1 to 50 hours, (b2) step : A molar ratio of the stannic oxide-zirconium oxide composite aqueous sol obtained in the step (a2) and M / Sb ₂ O ₅ of 0.02 to 4.00 (where M represents an amine molecule). Alkylamine having Yes _Sb 2 _{O 5} colloidal particles, an oligomer thereof, or an aqueous medium containing a mixture thereof, at a weight ratio of conversion was _{Sb 2 O 5 / (SnO 2} + ZrO 2) in the metal oxide from 0.01 to 0 Step (c2) Step: (c2) Step: (b2) Step (b2) Step of aging the aqueous medium at 20 to 300 ° C. for 0.1 to 50 hours, Step (d2): Step (c2) The modified stannic oxide-zirconium oxide composite aqueous sol was contacted with an anion exchanger and then aged at 20-300 ° C. for 0.1-50 hours to modify the stannic oxide-zirconium oxide A stable sol of composite colloidal particles is obtained. Aging at 100 ° C. or higher can be performed using an autoclave. The sol is composed of stannic oxide particles and zirconium oxide particles having an oxide ratio of ZrO ₂ : SnO ₂ of 0.05: 1 to 0.50: 1 and a particle diameter of 4 to 50 nm based on weight. Alkylamine-containing Sb ₂ O ₅ having a molar ratio of M / Sb ₂ O ₅ of 0.02 to 4.00 (where M represents an amine molecule) with the composite colloidal particle (A) as a core. Coated with colloidal particles, oligomers thereof or mixtures thereof (B1), and the weight ratio of (B1) / (A) is a ratio of 0.01 to 0.50 based on the weight ratio of the metal oxides And a sol containing composite colloidal particles of modified stannic oxide particles and zirconium oxide particles having a particle diameter of 4.5 to 60 nm.

Said manufacturing method can also be performed under pressure using an autoclave.
That is, in the method using stannic oxide sol that has been autoclaved in the nucleus, step (a3): hydrothermal treatment at a temperature of 100 to 300 ° C., and a particle size of 4 to 50 nm and 0.5 to 50% by weight of SnO _A step of preparing a stannic oxide aqueous sol having _two concentrations, step (b3): the aqueous stannic oxide sol obtained in step (a3) above, and M / Sb ₂ O of 0.02 to 4.00 ₅ molar ratio (wherein M is. showing the amine molecule) Sb ₂ of alkylamine-containing Sb ₂ O ₅ colloidal particles, an aqueous medium containing an oligomer thereof or a mixture thereof, in terms of the metal oxide having a Step of mixing 0.01 to 0.50 in a weight ratio of O ₅ / SnO ₂ , (c3) step: The aqueous medium obtained in step (b3) is aged at 20 to 300 ° C. for 0.1 to 50 hours Denatured from the process Stannic oxide aqueous sol can be obtained. In the sol obtained in the step (c3), the step (d3) can be added when the stannic oxide sol in the step (a3) contains an anion. That is, step (d3): The anion present in the sol is removed by contacting the modified stannic oxide aqueous sol obtained in step (c3) with an anion exchanger, and then 20 to A stable sol of modified stannic oxide colloidal particles can be obtained by adding a step of aging at 300 ° C. for 0.1 to 50 hours. Aging at 100 ° C. or higher can be performed using an autoclave. This sol has a molar ratio of M / Sb ₂ O ₅ of 0.02 to 4.00 (where M is an amine molecule) with stannic oxide colloidal particles (A) having a particle diameter of 4 to 50 nm as nuclei. Is coated with alkylamine-containing Sb ₂ O ₅ colloidal particles, oligomers thereof, or mixtures thereof (B1), and the weight ratio of (B1) / (A) is the weight ratio of the metal oxides A sol containing modified stannic oxide particles having a particle size of 4.5 to 60 nm, based on a ratio of 0.01 to 0.50.

In the method using an aqueous sol composed of composite particles of stannic oxide sol autoclaved at the core and zirconium oxide, step (a4): hydrothermal treatment at a temperature of 100 to 300 ° C. and 4 to 50 nm of a stannic oxide aqueous sol having SnO ₂ concentration of the particle diameter and 0.5 to 50 wt%, and an aqueous solution of oxyzirconium salt 0.5 to 50% strength by weight in terms of ZrO _2, ZrO ₂ / SnO ₂ is mixed at a weight ratio of 0.05 to 0.50, and the resulting mixture is heated at 60 to 100 ° C. for 0.1 to 50 hours to oxidize with a particle size of 4 to 50 nm. Step of adjusting stannic-zirconium oxide composite aqueous sol, (b4) step: stannic oxide-zirconium oxide composite aqueous sol obtained in step (a4), and 0.02 to 4.00 M / the molar ratio of b ₂ O ₅ (where M represents an amine molecule.) alkylamine-containing Sb ₂ O ₅ colloidal particles having, and an aqueous medium containing the oligomer, or a mixture thereof, converted into the metal oxides Step of mixing Sb ₂ O ₅ / (SnO ₂ + ZrO ₂ ) at a weight ratio of 0.01 to 0.50, (c4) Step: The aqueous medium obtained in Step (b4) is 0 at 20 to 300 ° C. 1. Step for aging for 1 to 50 hours, and step (d4): The modified stannic oxide-zirconium oxide composite aqueous sol obtained in step (c4) is contacted with an anion exchanger, and then 20 to 300 A stable sol of modified stannic oxide-zirconium oxide composite colloidal particles can be obtained by aging at 50 ° C. for 0.1 to 50 hours. The sol is composed of stannic oxide particles and zirconium oxide particles having an oxide ratio of ZrO ₂ : SnO ₂ of 0.05: 1 to 0.50: 1 and a particle diameter of 4 to 50 nm based on weight. Alkylamine-containing Sb ₂ O ₅ having a molar ratio of M / Sb ₂ O ₅ of 0.02 to 4.00 (where M represents an amine molecule) with the composite colloidal particle (A) as a core. Coated with colloidal particles, oligomers thereof or mixtures thereof (B1), and the weight ratio of (B1) / (A) is a ratio of 0.01 to 0.50 based on the weight ratio of the metal oxides And a sol containing composite colloidal particles of modified stannic oxide particles and zirconium oxide particles having a particle diameter of 4.5 to 60 nm.

In the present invention, when stannic oxide is used for the nucleus, the step (a5): a stannic oxide colloidal particle having a particle diameter of 4 to 50 nm is contained as SnO _{2 in} a concentration of 1 to 50% by weight. Step of adjusting the aqueous tin sol, (b5) step: Five having a molar ratio of stannic oxide aqueous sol obtained in the above step (a5) and SiO ₂ / Sb ₂ O ₅ of 0.55 to 55 An aqueous medium containing composite colloidal particles of antimony oxide and silica, an oligomer thereof, or a mixture thereof is converted into the metal oxide in a weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / SnO ₂ to 0.01 to Step of mixing to 0.50, (c5) step: Step of aging the aqueous medium obtained in step (b5) at 20 to 300 ° C. for 0.1 to 50 hours, Stable Le is obtained. In the sol obtained in the step (c5), when the stannic oxide sol in the step (a5) contains an anion, the step (d5) can be added. That is, step (d5): The modified stannic oxide aqueous sol obtained in step (c5) is contacted with an anion exchanger to remove anions present in the sol, and then 20 to 20 A stable sol of modified stannic oxide colloidal particles can be obtained by adding a step of aging at 300 ° C. for 0.1 to 50 hours. Aging at 100 ° C. or higher can be performed using an autoclave. This sol is composed of stannic oxide colloidal particles (A) having a particle diameter of 4 to 50 nm as a nucleus and antimony pentoxide and silica having a SiO ₂ / Sb ₂ O ₅ molar ratio of 0.55 to 55 on the surface. Coated with composite colloidal particles, oligomers thereof, or mixtures thereof (B2), and the weight ratio of (B2) / (A) is from 0.01 to 0.50 based on the weight ratio of the metal oxides And a sol containing modified stannic oxide particles having a particle size of 4.5-60 nm.

In the present invention, when colloidal particles of stannic oxide and zirconium oxide are used for the core, step (a6): oxidation step having a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight. two tin aqueous sol, an aqueous solution of oxyzirconium salt 0.5 to 50% strength by weight in terms of ZrO _2, were mixed in a weight ratio of ZrO 2 / SnO ₂ as 0.05 to 0.50, obtained A step of preparing a stannic oxide-zirconium oxide composite aqueous sol having a particle size of 4 to 50 nm by heating the obtained mixed liquid at 60 to 100 ° C. for 0.1 to 50 hours, step (b6) A stannic oxide-zirconium oxide composite aqueous sol obtained in the step (a6), antimony pentoxide / silica composite colloidal particles having a molar ratio of SiO ₂ / Sb ₂ O ₅ of 0.55 to 55, The oligomer or the aqueous medium containing the mixture thereof is mixed to 0.01 to 0.50 in a weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / (SnO ₂ + ZrO ₂ ) in terms of the metal oxide. Step (c6): Step (b6) The aqueous medium obtained in Step (b6) is aged at 20 to 300 ° C. for 0.1 to 50 hours, and Step (d6): Modified in Step (c6) Stannic oxide-zirconium oxide composite colloidal particles obtained by contacting an aqueous sol of stannic oxide-zirconium oxide composite with an anion exchanger and then aging for 0.1-50 hours at 20-300 ° C. A stable sol can be obtained. Aging at 100 ° C. or higher can be performed using an autoclave. The sol is composed of stannic oxide particles and zirconium oxide particles having an oxide ratio of ZrO ₂ : SnO ₂ of 0.05: 1 to 0.50: 1 and a particle diameter of 4 to 50 nm based on weight. Antimony pentoxide and silica composite colloidal particles having an SiO ₂ / Sb ₂ O ₅ molar ratio of 0.55 to 55, their oligomers, or a mixture thereof, with the composite colloidal particles (A) as nuclei ( B2), and the weight ratio of (B2) / (A) is a ratio of 0.01 to 0.50 based on the weight ratio of the metal oxides, and a particle size of 4.5 to 60 nm. A sol containing complex colloidal particles of modified stannic oxide particles and zirconium oxide particles.

Said manufacturing method can also be performed under pressure using an autoclave.
That is, in the method using a stannic oxide sol that has been autoclaved in the core, step (a7): hydrothermal treatment at a temperature of 100 to 300 ° C., and a particle size of 4 to 50 nm and 0.5 to 50% by weight of SnO. Step of adjusting stannic oxide aqueous sol having _two concentrations, step (b7): stannic oxide aqueous sol obtained in step (a7) above, and SiO ₂ / Sb ₂ O _{5 of} 0.55 to 55 The weight of (Sb ₂ O ₅ + SiO ₂ ) / SnO ₂ in terms of the metal oxide was converted to an aqueous medium containing composite colloidal particles of antimony pentoxide and silica having a molar ratio thereof, oligomers thereof, or mixtures thereof. A step of mixing 0.01 to 0.50 at a ratio, (c7) step: the oxidized medium modified from the step of aging the aqueous medium obtained in step (b7) at 20 to 300 ° C. for 0.1 to 50 hours Two An aqueous sol is obtained. In the sol obtained in the step (c7), the step (d7) can be added when the stannic oxide sol in the step (a7) contains an anion. That is, step (d7): The modified stannic oxide aqueous sol obtained in step (c7) is contacted with an anion exchanger to remove anions present in the sol, and then 20 to 20 A stable sol of modified stannic oxide colloidal particles can be obtained by adding a step of aging at 300 ° C. for 0.1 to 50 hours. This sol is composed of stannic oxide colloidal particles (A) having a particle diameter of 4 to 50 nm as a nucleus and antimony pentoxide and silica having a SiO ₂ / Sb ₂ O ₅ molar ratio of 0.55 to 55 on the surface. A composite colloidal particle, an oligomer thereof, or a mixture thereof (B2) and a weight ratio of (B2) / (A) of 0.01 to 0.50 based on the weight ratio of the metal oxides And a sol containing modified stannic oxide particles having a particle size of 4.5-60 nm.

In the method using an aqueous sol composed of composite particles of stannic oxide sol autoclaved at the core and zirconium oxide, step (a8): hydrothermal treatment at a temperature of 100 to 300 ° C. and 4 to 50 nm of a stannic oxide aqueous sol having SnO ₂ concentration of the particle diameter and 0.5 to 50 wt%, and an aqueous solution of oxyzirconium salt 0.5 to 50% strength by weight in terms of ZrO _2, ZrO ₂ / SnO ₂ is mixed at a weight ratio of 0.05 to 0.50, and the resulting mixture is heated at 60 to 100 ° C. for 0.1 to 50 hours to oxidize with a particle size of 4 to 50 nm. Step of adjusting stannic-zirconium oxide composite aqueous sol, (b8) step: stannic oxide-zirconium oxide composite aqueous sol obtained in step (a8), 0.52 to 55 SiO ₂ An aqueous medium containing a composite colloidal particle of antimony pentoxide and silica having a molar ratio of / Sb ₂ O _5, an oligomer thereof, or a mixture thereof was converted into the metal oxide (Sb ₂ O ₅ + SiO ₂ ). / (SnO ₂ + ZrO ₂ ) in a weight ratio of 0.01 to 0.50, (c8) step: the aqueous medium obtained in (b8) step at 20 to 300 ° C. for 0.1 to 50 hours Step of aging, and step (d8): The modified stannic oxide-zirconium oxide composite aqueous sol obtained in step (c8) is contacted with an anion exchanger, and then at 20 to 300 ° C., 0.1% A stable sol of modified stannic oxide-zirconium oxide composite colloidal particles is obtained after aging for -50 hours. The sol is composed of stannic oxide particles and zirconium oxide particles having an oxide ratio of ZrO ₂ : SnO ₂ of 0.05: 1 to 0.50: 1 and a particle diameter of 4 to 50 nm based on weight. Antimony pentoxide and silica composite colloidal particles having an SiO ₂ / Sb ₂ O ₅ molar ratio of 0.55 to 55, their oligomers, or a mixture thereof, with the composite colloidal particles (A) as nuclei ( B2), and the weight ratio of (B2) / (A) is a ratio of 0.01 to 0.50 based on the weight ratio of the metal oxides, and a particle size of 4.5 to 60 nm. A sol containing complex colloidal particles of modified stannic oxide particles and zirconium oxide particles.

  In the production method for obtaining the sol of the present invention, there are a case where the particles used for the core are stannic oxide and a case where a stannic oxide and zirconium oxide composite sol is used. The former has a rutile-type crystal structure, and those obtained by applying these sols to a substrate as a coating composition and calcining have a high refractive index (the refractive index calculated from the coating film is 1.7 to 1.8) and Excellent transparency. In addition to the former performance, the latter has excellent weather resistance (light) performance by compounding zirconium oxide.

  Each of the above sols may or may not be autoclaved with stannic oxide. The latter has a high refractive index (refractive index calculated from the coating is 1.8 to 1.9) while having the excellent performance of the former, and coating the sol as a coating composition on a substrate and baking it. Have

The modified stannic oxide-zirconium oxide composite colloidal particles can be observed with an electron microscope and have a particle diameter of approximately 4.5 to 60 nm. The sol obtained by the above mixing has a pH of about 1 to 9, but contains a large amount of anions such as Cl ⁻ , NO ₃ ⁻ , and CH ₃ COO ⁻ derived from the oxyzirconium salt used for the modification. Due to the inclusion, the colloidal particles are microaggregated, and the transparency of the sol is low.

  By removing the anion in the sol obtained by the above mixing in step (d), the stannic oxide-zirconium oxide composite colloid having a pH of 3 to 11.5 and having a stable and good transparency can be obtained. A sol of particles can be obtained.

  The anion removal in the step (d) is obtained by treating the sol obtained by the above mixing with a hydroxyl group type anion exchange resin at a temperature of 100 ° C. or lower, preferably room temperature (20 ° C.) to about 60 ° C. A commercially available product can be used as the hydroxyl type anion exchange resin, but a strong base type such as Amberlite 410 is preferable.

  The treatment with the hydroxyl group type anion exchange resin in the step (d) is particularly preferably performed at a metal oxide concentration of 1 to 10% by weight of the sol obtained by mixing in the step (c).

The production method of (a1 to d1), the production method of (a2 to d2), the production method of (a5 to d5) and the production method of (d6 to d6) using a stannic oxide sol that is not subjected to hydrothermal treatment (autoclave treatment) In the production method, in step (c), aging can be performed at a temperature of 20 to 100 ° C. for 0.1 to 200 hours, but hydrothermal treatment at 100 to 300 ° C. can be performed for 0.1 to 200 hours. Is possible.
Moreover, the manufacturing method of (a3-d3), the manufacturing method of (a4-d4), the manufacturing method of (a7-d7), and (a8-d8) which use the stannic oxide sol which performed the hydrothermal treatment (autoclave process) as a raw material In the production method (1), aging can be performed at a temperature of 20 to 100 ° C. for 0.1 to 200 hours in the step (c), but a hydrothermal treatment at 100 to 300 ° C. is performed for 0.1 to 200 hours. It is also possible.

The modified stannic oxide aqueous sol according to the invention and the preferred aqueous composite sol of modified stannic oxide-zirconium oxide have a pH of 1.5 to 11.5, this pH being greater than 11.5. Then, the modified stannic oxide colloid and the Sb ₂ O ₅ colloid covering the modified stannic oxide-zirconium oxide composite colloid particles are easily dissolved in the liquid. Further, when the total concentration of all metal oxides in the sol of the modified stannic oxide colloid and the modified stannic oxide-zirconium oxide composite colloidal particles exceeds 60% by weight, such a sol is insoluble. It tends to be stable. A preferred concentration for industrial products is about 10 to 50% by weight.

  The modified metal oxide sol of the present invention can contain other optional components as long as the object of the present invention is achieved. Particularly when oxycarboxylic acids are contained in an amount of about 30% by weight or less based on the total amount of all metal oxides, a colloid with further improved performance such as dispersibility can be obtained.

  When a silane coupling agent or a hydrolyzate thereof is mixed with the modified metal oxide sol of the present invention to form a coating composition, the pH of the silane coupling agent or the hydrolyzate is weakly acidic. An acid can be added to the modified metal oxide sol of the present invention to lower the pH beforehand. In this case, the pH of the modified metal oxide sol is about 4-6. Thereby, the compatibility of the modified metal oxide particles and the silane coupling component in the coating composition is improved, and the coating characteristics and the storage stability of the coating composition are improved.

Examples of the oxycarboxylic acid used include lactic acid, tartaric acid, citric acid, gluconic acid, malic acid, glycolic acid and the like. Moreover, it can contain an alkali component, for example, alkali metal hydroxides such as Li, Na, K, Rb, and Cs, alkylamines such as NH ₄ , ethylamine, triethylamine, isopropylamine, and n-propylamine; benzyl Aralkylamines such as amines; alicyclic amines such as piperidine; alkanolamines such as monoethanolamine and triethanolamine. These can contain 2 or more types in mixture. Moreover, it can use together with said acidic component. These can be contained in an amount of about 30% by weight or less based on the total amount of all metal oxides.

  When it is desired to further increase the sol concentration, it can be concentrated to a maximum of about 50% by weight by a conventional method such as an evaporation method or an ultrafiltration method. When it is desired to adjust the pH of the sol, the alkali metal, organic base (amine), oxycarboxylic acid or the like can be added to the sol after concentration. In particular, a sol having a total concentration of metal oxides of 10 to 40% by weight is practically preferable. When the ultrafiltration method is used as the concentration method, polyanions coexisting in the sol, ultrafine particles, etc. pass through the ultrafiltration membrane together with water, so these polyanions that cause destabilization of the sol, Very fine particles and the like can be removed from the sol.

  When the modified metal oxide colloid obtained by the above mixing is an aqueous sol, an organosol can be obtained by replacing the aqueous medium of the aqueous sol with a hydrophilic organic solvent. This substitution can be performed by a usual method such as a distillation method or an ultrafiltration method. Examples of the hydrophilic organic solvent include lower alcohols such as methyl alcohol, ethyl alcohol, and isopropyl alcohol; linear amides such as dimethylformamide and N, N′-dimethylacetamide; cyclic amides such as N-methyl-2-pyrrolidone And glycols such as ethyl cellosolve and ethylene glycol.

Preparation of nuclear sol A-1-1 Manufacture of stannic oxide sol 41 kg of 35% hydrochloric acid and 110 kg of pure water were placed in a 0.5 m ³ GL reaction tank, heated to 70 ° C. with stirring, and then cooled. Addition of 185 kg of 35% hydrogen peroxide water and 90 kg of metal tin powder (manufactured by Yamaishi Metal, AT-SnNO200N, containing 99.7% as SnO ₂ ) was carried out alternately 18 times. Add hydrogen peroxide solution and metal tin 10kg of 35% hydrogen peroxide solution first, then gradually add 5kg of metal tin and wait for the reaction to finish (10-15 minutes). The method was repeated by repeating the addition of tin. The reaction reached 90-95 ° C. due to the addition of metallic tin due to the heat of reaction. Accordingly, the reaction temperature was 70 to 95 ° C. The ratio of hydrogen peroxide to metallic tin was 2.5 for the H ₂ O ₂ / Sn molar ratio. The time required for the addition of the hydrogen peroxide solution and metal tin was 4.5 hours. After completion of the addition, aging was performed for 0.5 hours while maintaining the liquid temperature at 90 to 95 ° C. The Sn / Cl equivalent ratio during the reaction was 1.92.

  After completion of aging, stirring was stopped and the mixture was cooled and allowed to stand overnight. By standing, the tin oxide colloid aggregates settled, and two layers were separated into a supernatant layer and a sedimented layer. The supernatant liquid was transparent and had almost no colloidal color. The supernatant liquid was removed by a gradient method. The weight of the supernatant was 205 kg. By adding 125 kg of water to the remaining tin oxide colloid aggregate slurry and stirring at 30 ° C. for 4 hours, the tin oxide colloid aggregate was peptized to form a tin oxide sol.

  The obtained tin oxide sol was 340 kg. This sol was a pale yellow transparent sol. The particle diameter of the tin oxide colloid was 10 nm or less with an electron microscope. It was stable even when left at room temperature for over 1 year.

After 322 kg of this pale yellow stannic oxide sol was dispersed in 2118 kg of water, 2.42 kg of isopropylamine was added thereto, followed by heat aging at 80 to 85 ° C. for 3 hours. After cooling, the solution was passed through a column filled with a hydroxyl group-type anion exchange resin to obtain 2175 kg of an alkaline second aqueous sol. This sol is stable and has a colloidal color, but is very transparent, with a specific gravity of 1.032, pH of 10.01, SnO ₂ content of 4.14% by weight, isopropylamine content of 0.11% by weight. there were.

A-1-2 Production of stannic oxide sol 37.5 kg of oxalic acid ((COOH) ₂ .2H ₂ O) was dissolved in 220 kg of pure water, and this was taken up in a 0.5 m ³ GL vessel and stirred while stirring. After warming to ° C., 150 kg of 35% hydrogen peroxide water and 75 kg of metal tin powder (Yamaishi Metal, AT-SnNO200N, containing 99.7% as SnO ₂ ) were added. The hydrogen peroxide solution and metal tin were added alternately in 15 divided portions. First, 10 kg of 35% aqueous hydrogen peroxide was added, and then 5 kg of metallic tin. This operation was repeated after the reaction was completed (10-15 minutes).

The time required for the addition was 2.5 hours, and after completion of the addition, the reaction was terminated by heating for 1 hour while maintaining the liquid temperature at 90 ° C. The hydrogen peroxide to metal tin ratio was 2.44 in terms of the H ₂ O ₂ / Sn molar ratio. The yield of the resulting tin oxide sol was 352 kg, the specific gravity was 1.22, pH 1.49, SnO ₂ was 26.1% by weight, the oxalic acid concentration from the charge was 7.6% by weight, (COOH) ₂ / SnO ₂ molar ratio Was 0.47. The obtained sol had thixotropy but was less thixotropy than when an aqueous hydrochloric acid solution was used.

  The particle diameter of the tin oxide colloid was 10 to 15 nm in the electron microscope, and the particles were spherical and had good dispersibility. This sol showed a tendency to thicken slightly when left standing, but was not stable when left at room temperature for 6 months and was stable.

After 230 kg of this pale yellow stannic oxide sol was dispersed in 1100 kg of water, 3.0 kg of isopropylamine was added thereto, and then this liquid was passed through a column filled with a hydroxyl group type anion exchange resin to make it alkaline. Thereafter, this sol was heated and aged at 90 ° C., and again passed through a column filled with an anion exchange resin to obtain 1431 kg of an alkaline stannic oxide aqueous sol. The obtained sol was stable and very transparent, and was a stannic oxide sol having a specific gravity of 1.034, a pH of 11.33, a SnO ₂ content of 4.04% by weight and an isopropylamine content of 0.21% by weight.
A-1-3 Manufacture of stannic oxide sol by autoclaving 2300 g of the alkaline stannic oxide aqueous sol obtained in A-1-1 was aged by heating at 140 ° C. for 5 hours in an autoclave.
A-1-4 Production of stannic oxide sol by autoclaving 800 kg of alkaline stannic oxide sol obtained in A-1-2 was aged by heating at 140 ° C. for 5 hours in an autoclave.
A-1-5 Production of stannic oxide sol by autoclave treatment 600 kg of the alkaline stannic oxide sol obtained in A-1-2 was aged by heating at 240 ° C. for 5 hours in an autoclave.
B. Preparation of coating material B-1-1 Preparation of alkali component-containing antimony pentoxide colloid 52 ml of antimony trioxide (Guangdong Mikuni, containing 99.5% as Sb ₂ O ₃ ) was added to a 500 ml four-necked flask. 1.6 g, 444 g of pure water and 40.2 g of diisopropylamine were added, the temperature was raised to 70 ° C. with stirring with a stirrer, and 53 g of 35% hydrogen peroxide was gradually added. After completion of the reaction, the mixture was filtered through glass filter paper (manufactured by ADVANTEC, GA-100). The resulting aqueous medium containing an alkali component-containing diantimony pentaoxide colloid and an oligomer thereof has a concentration of 9.8% by weight as _Sb 2 _{O 5,} 6.8 wt% as diisopropylamine, diisopropylamine / _Sb 2 _{O 5} The molar ratio was 2.2, and particles of 10 nm or less were observed by observation with a transmission electron microscope.
B-1-2 Preparation of alkali component-containing antimony pentoxide colloid 12.5 kg of antimony trioxide (manufactured by Guangdong Mikuni, containing 99.5% as Sb ₂ O ₃ ) in 100 liter vessel, pure water 66. 0 kg and 12.5 kg of potassium hydroxide (containing 95% as KOH) were added, and 8.4 kg of 35% hydrogen peroxide was gradually added under stirring. The obtained aqueous potassium antimonate solution was 15.25 wt% as Sb ₂ O ₅ , 5.36 wt% as potassium hydroxide, and the molar ratio of K ₂ O / Sb ₂ O ₅ was 1.0.

The obtained aqueous solution of potassium antimonate was diluted to 2.5% by weight and passed through a column packed with a hydrogen-type cation exchange resin. To the antimonic acid solution after the ion exchange, 6.6 kg of diisopropylamine was added with stirring to obtain an aqueous medium containing an alkali component-containing antimony pentoxide colloid and its oligomer. Concentration is 1.8% by weight as Sb ₂ O ₅ , 1.2% by weight as diisopropylamine, the molar ratio of diisopropylamine / Sb ₂ O ₅ is 1.69, and particles of 10 nm or less are observed by transmission electron microscope. It was.
B-2-1 Preparation of antimony pentoxide-silica composite colloid 546 g of an aqueous potassium silicate solution (containing 15.4 wt% as SiO ₂ ) was diluted with 542 g of pure water, and then an aqueous potassium antimonate solution ( 14.6% by weight as Sb ₂ O ₅ ) was mixed and stirred for 1 hour to obtain a mixed aqueous solution of potassium silicate and potassium antimonate.

  The obtained mixed aqueous solution of potassium silicate and potassium antimonate is diluted with pure water to 5% by weight, and then passed through a column filled with a cation type ion exchange resin, whereby antimony pentoxide-silica composite An aqueous medium containing the colloid and its oligomer was obtained.

  The obtained composite colloid was colorless and transparent, had a pH of 1.8, and particles of 5 nm or less were observed by observation with a transmission electron microscope.

Example 1
Step (a): An alkaline stannic oxide aqueous sol (A-1-1) having a particle diameter of 10 nm or less and an SnO ₂ concentration of 4.14% by weight was obtained.
(B) Step: 1207.7 g of the aqueous sol obtained in A-1-1 (containing 50 g as SnO ₂ ) contains the amine component-containing antimony pentoxide colloid prepared in B-1-1 and its oligomer. 51.0 g of an aqueous medium was added with stirring, and the mixture was mixed to 0.1 at a weight ratio of (B-1-1) / (A-1-1) converted to the metal oxide.
Step (c): The aqueous medium obtained in Step (b) was aged by heating at 90 ° C. for 3 hours.

  The obtained modified stannic oxide aqueous sol (dilute liquid) was concentrated at room temperature with an ultrafiltration membrane filtration device having a molecular weight cut off of 50,000, and 270 g of high concentration modified stannic oxide aqueous sol was obtained. Obtained. This sol has a specific gravity of 1.220, a pH of 7.90, and a viscosity of 2.3 c. p. The concentration in terms of metal oxide was stable at 20.3% by weight.

  246 g of the above modified stannic oxide aqueous sol having a high concentration was distilled off with a rotary evaporator under reduced pressure while adding 9 liters of methanol little by little at a liquid temperature of 30 ° C. 159 g of modified stannic oxide methanol sol substituted with This sol has a specific gravity of 1.092, a pH of 7.70 (equal mixture with water), a viscosity of 2.3 c. p. The concentration in terms of metal oxide was 30% by weight, the water content was 0.65% by weight, and the particle diameter was 5 to 15 nm as observed with an electron microscope. The sol had a colloidal color, high transparency, and was stable with no abnormalities such as precipitate formation, white turbidity, and thickening after standing at room temperature for 3 months. The refractive index of the dried sol was 1.76.

Example 2
Containing the alkali component-containing antimony pentoxide colloid of the B-1-1 component of Example 1 and its oligomer so that the weight ratio of (B) / (A) converted to metal oxide is mixed to 0.1 The same procedure as in Example 1 was conducted except that 51 g of the aqueous medium was changed to 277.8 g of an aqueous medium containing an alkali component-containing antimony pentoxide colloid of B-1-2 and its oligomer.

The resulting modified high concentration stannic oxide aqueous sol has a specific gravity of 1.218, a pH of 8.80 and a viscosity of 2.8 c. p. The concentration in terms of metal oxide was stable at 20.4% by weight.
245 g of the above-mentioned modified stannic oxide aqueous sol having a high concentration was distilled off while adding 10 liters of methanol little by little at a liquid temperature of 30 ° C. or less under reduced pressure using a rotary evaporator. 162 g of modified stannic oxide methanol sol substituted with methanol was obtained. This sol has a specific gravity of 1.093, a pH of 8.34 (equal mixture with water), and a viscosity of 1.8 c. p. The concentration in terms of metal oxide was 30% by weight, the water content was 0.81% by weight, and the particle diameter was 5 to 15 nm as observed with an electron microscope. This sol had a colloidal color, high transparency, and was stable with no abnormalities such as precipitate formation, white turbidity, and thickening even after standing at room temperature for 3 months. The refractive index of the dried sol was 1.76.

Example 3
The stannic oxide colloid of component A-1-1 in Example 1 was mixed with component A-1-3 so that the weight ratio of (B) / (A) converted to metal oxide was mixed to 0.1. An aqueous medium containing an alkali component-containing antimony pentoxide colloid and its oligomer as a B-1-1 component to 1207.7 g of stannic oxide colloid, and an alkali component-containing antimony pentoxide colloid and its oligomer as a B-1-2 component The same procedure as in Example 1 was conducted except that the aqueous medium was changed to 277.8 g.

  The resulting modified high concentration stannic oxide aqueous sol has a specific gravity of 1.220, a pH of 8.51, and a viscosity of 2.4 c. p. The concentration in terms of metal oxide was stable at 21.2% by weight.

  236 g of the above-modified stannic oxide aqueous sol having a high concentration was distilled off under reduced pressure using a rotary evaporator at a liquid temperature of 30 ° C. or less while adding 8 liters of methanol little by little to remove the water of the aqueous sol. 160 g of modified stannic oxide methanol sol substituted with methanol was obtained. This sol has a specific gravity of 1.092, a pH of 8.0 (equal mixture with water), a viscosity of 1.2 c. p. The concentration in terms of metal oxide was 30% by weight, the water content was 0.75% by weight, and the particle diameter was 10 to 15 nm as observed with an electron microscope. The sol had a colloidal color, high transparency, and was stable with no abnormalities such as precipitate formation, white turbidity, and thickening after standing at room temperature for 3 months. The refractive index of the dried sol was 1.87.

Example 4
The stannic oxide colloid of component A-1-1 in Example 1 was mixed with component A-1-4 so that the weight ratio of (B) / (A) converted to metal oxide was mixed to 0.1. An aqueous medium containing an alkali component-containing antimony pentoxide colloid and its oligomer as a B-1-1 component to 1237.7 g of stannic oxide colloid, and an alkali component-containing antimony pentoxide colloid and its oligomer as a B-1-2 component The same procedure as in Example 1 was conducted except that the aqueous medium was changed to 277.8 g.

  The resulting modified high concentration stannic oxide aqueous sol has a specific gravity of 1.226, a pH of 7.92, a viscosity of 3.1 c. p. The concentration in terms of metal oxide was stable at 22.0% by weight.

  By distilling off water while gradually adding 9 liters of methanol at a liquid temperature of 30 ° C. or less while 227 g of the above modified stannic oxide aqueous sol having a high concentration was reduced by a rotary evaporator, 160 g of modified stannic oxide methanol sol substituted with methanol was obtained. This sol has a specific gravity of 1.084, a pH of 8.0 (equal mixture with water), a viscosity of 1.1 cp, a concentration converted to a metal oxide of 30% by weight, a water content of 0.68% by weight, and a particle diameter by electron microscope observation. Was 10-15 nm. The sol had a colloidal color, high transparency, and was stable with no abnormalities such as precipitate formation, white turbidity, and thickening after standing at room temperature for 3 months. The refractive index of the dried sol was 1.92.

Example 5
Step (a): (. Containing 17.68% by weight in terms of ZrO ₂₎ oxy dissolved aqueous solution of zirconium oxychloride, zirconium chloride (ZrOCl ₂ · _{8H 2} O) with pure water 9.16Kg (the ZrO ₂ 500 kg of pure water is added with stirring, and 0.40 kg of 35% hydrochloric acid is added, and then 270 kg of the alkaline stannic oxide aqueous sol prepared in A-1-2 is contained. Contains 10.8 kg as SnO ₂ ) was added and stirring was continued for 10 minutes. The mixed liquid was a sol having a ZrO ₂ / SnO ₂ weight ratio of 0.15 and having a colloidal color and good transparency. The prepared liquid mixture was heat-treated at 95 ° C. for 5 hours with stirring to obtain 779.2 kg of a stannic oxide-zirconium oxide composite sol. The sol had 1.38% by weight SnO _{2, 0.21%} by weight as ZrO _2, was 1.59 wt% as SnO ₂ + ZrO 2.
(B) Step: 68.83 kg of the aqueous medium containing the colloid of amine-containing antimony pentoxide obtained in B-1-2 and its oligomer (containing 1.24 kg in terms of Sb ₂ O ₅ ). Under stirring, 779.2 kg of the stannic oxide-zirconium oxide composite sol obtained in the step (a) was gradually added and mixed at a ratio of Sb ₂ O ₅ / (SnO ₂ + ZrO ₂ ) = 0.1. did.
Step (c): The aqueous medium obtained in Step (b) was stirred at 20 to 30 ° C. for 1 hour.
Step (d): The anion (Cl ⁻ ) contained in the sol was removed by passing the mixed sol-like slurry obtained in the step (c) through a column filled with a hydroxyl group-type anion exchange resin. . Subsequently, the stannic oxide-zirconium oxide composite sol modified by heating and aging at 90 to 95 ° C. for 2 to 3 hours was obtained. This sol had a specific gravity of 1.011 and a viscosity of 2.9 c. p. The sol had a pH of 10.58 and good transparency.

  The obtained modified stannic oxide-zirconium oxide composite aqueous sol (dilute liquid) is concentrated by a filtration device of an ultrafiltration membrane having a fractional molecular weight of 100,000, and a high concentration modified stannic oxide- 64.7 kg of an aqueous sol of the zirconium oxide composite was obtained. This sol has a specific gravity of 1.233 and a viscosity of 4.8 c. p. , PH 9.75, and stable at a total metal oxide concentration of 22.1% by weight.

  The aqueous sol was prepared by gradually distilling off water while gradually adding 1200 kg of methanol at a liquid temperature of 30 ° C. or lower under reduced pressure using a rotary evaporator with 50 kg of the above-modified stannic oxide-zirconium oxide composite sol having a high concentration. 30.8 kg of methanol sol of a modified stannic oxide-zirconium oxide composite in which was replaced with methanol was obtained. The methanol sol of the modified stannic oxide-zirconium oxide complex obtained by adjusting the filtration concentration of this sol has a particle diameter of 12 nm by electron microscope observation, a specific gravity of 1.086, and a viscosity of 3.2 c. p. , PH 8.81 (equal mixture with water), the concentration in terms of metal oxide was 30.4% by weight and water 0.37% by weight. This sol had a colloidal color, high transparency, and was stable with no abnormalities such as precipitate formation, white turbidity, and thickening even after standing at room temperature for 3 months. The sol had a refractive index of 1.87.

Example 6
Step (a): zirconium oxychloride aqueous solution in which zirconium oxychloride (ZrOCl ₂ .8H ₂ O) is dissolved in pure water (containing 17.68% by weight in terms of ZrO ₂ ) 13.6 kg (in ZrO ₂ 500 kg of pure water is added under stirring, 0.59 kg of 35% hydrochloric acid is added, and then 396 kg of the alkaline stannic oxide aqueous sol prepared in A-1-4 is added. (Contains 16.0 kg as SnO ₂ ) was added and stirring was continued for 10 minutes. The mixed solution was a highly transparent sol having a colloidal color with a ZrO ₂ / SnO ₂ weight ratio of 0.15 and a pH of 1.72. The prepared mixed solution was heat-treated at 95 ° C. for 5 hours with stirring to obtain 910.2 kg of a stannic oxide-zirconium oxide composite sol. The sol had 1.75% by weight SnO _{2, 0.26%} by weight as ZrO _2, was 2.01 wt% as SnO ₂ + ZrO 2.
(B) Step: 102 kg (1.84 kg as Sb ₂ O ₅ ) of the aqueous medium containing the colloid of amine-containing antimony pentoxide obtained in B-1-2 and its oligomer was stirred in step (a). 910.2 kg of the obtained stannic oxide-zirconium oxide composite sol was gradually added and mixed at a ratio of 0.1 as a weight ratio of Sb ₂ O ₅ / (SnO ₂ + ZrO ₂ ).
Step (c): The aqueous medium obtained in Step (b) was stirred at 20 to 30 ° C. for 1 hour.
Step (d): The anion (Cl ⁻ ) contained in the sol was removed by passing the mixed sol-like slurry obtained in the step (c) through a column filled with a hydroxyl group-type anion exchange resin. . Subsequently, a modified stannic oxide-zirconium oxide composite sol obtained by heating and aging at 90 to 95 ° C. for 2 to 3 hours was obtained.

The mixed sol-like slurry obtained in the step (c) is passed through a column filled with a hydroxyl group-type anion exchange resin in the step (d), thereby removing anions (Cl ⁻ ) contained in the sol. did. Subsequently, the stannic oxide-zirconium oxide composite sol modified by heating and aging at 90 to 95 ° C. for 2 to 3 hours was obtained. This sol has a specific gravity of 1.012 and a viscosity of 3.0 c. p. The sol had a pH of 10.78 and good transparency.

  The obtained modified stannic oxide-zirconium oxide composite aqueous sol (dilute liquid) is concentrated by a filtration device of an ultrafiltration membrane having a fractional molecular weight of 100,000, and a high concentration modified stannic oxide- 69.5 kg of zirconium oxide composite aqueous sol was obtained. This sol has a specific gravity of 1.284 and a viscosity of 5.0 c. p. , PH 10.19, and stable at a total metal oxide concentration of 26.1% by weight.

  The aqueous sol was obtained by distilling off water while gradually adding 1255 kg of methanol at a liquid temperature of 30 ° C. or lower under reduced pressure using a rotary evaporator under reduced pressure of 50 kg of the above modified stannic oxide-zirconium oxide composite aqueous sol. 36.9 kg of a modified stannic oxide-zirconium oxide complex methanol sol substituted with methanol was obtained. The modified stannic oxide-zirconium oxide complex methanol sol obtained by filtering and adjusting the concentration of the sol has a particle diameter of 13 nm as observed by an electron microscope, a specific gravity of 1.086, and a viscosity of 4.2 c. p. PH 8.92 (equal mixture with water), the concentration in terms of metal oxide was 30.3% by weight, and the water content was 0.33% by weight. This sol had a colloidal color, high transparency, and was stable with no abnormalities such as precipitate formation, white turbidity, and thickening even after standing at room temperature for 3 months. Moreover, the refractive index of this sol was 1.92.

Example 7
(A) Step: 191.6 g (containing 50 g of SnO ₂ ) of the acidic aqueous sol obtained in A-1-2 was diluted to 8 wt% with pure water.

(B) Step: Obtained in step (a) to 500 g of an aqueous medium containing the composite colloid of antimony pentoxide-silica obtained in B-2-1 and its oligomer (containing 10 g as Sb ₂ O ₅ + SiO ₂ ). The stannic oxide aqueous sol was added under stirring and mixed to 0.2 at a weight ratio of (B) / (A) converted to the metal oxide.

  Step (c): The aqueous medium obtained in Step (b) was aged by heating at 90 to 95 ° C. for 2 hours.

The obtained modified stannic oxide aqueous sol (dilute liquid) was concentrated at room temperature with an ultrafiltration membrane filtration device having a molecular weight cut off of 50,000, and 472 g of a high concentration modified stannic oxide aqueous sol was obtained. Obtained. This sol has a pH of 1.87 and a viscosity of 2.3 c. p. The concentration in terms of metal oxide was stable at 12.7% by weight.
The aqueous sol was dissolved in methanol by distilling off 472 g of the above-modified stannic oxide aqueous sol having a high concentration in a rotary evaporator under reduced pressure while gradually adding 9 liters of methanol at a liquid temperature of 30 ° C. or less. 190 g of modified stannic oxide methanol sol substituted with This sol has a specific gravity of 1.091, a pH of 2.06 (equal mixture with water), a viscosity of 1.6 c. p. The concentration in terms of metal oxide was 30% by weight, the transmittance was 68%, the water content was 0.9% by weight, and the particle diameter was 10 to 15 nm as observed with an electron microscope. This sol had a colloidal color, high transparency, and was stable with no abnormalities such as precipitate formation, white turbidity, and thickening even after standing at room temperature for 3 months. The refractive index of the dried sol was 1.8.

Example 8
(A) Step: a zirconium oxychloride (ZrOCl ₂ · _{8H 2} O) zirconium oxychloride solution prepared by dissolving in pure water (17.68% as ZrO ₂₎ 9.16kg (1.62kg as ZrO _2), purified water 500 kg with stirring, further 0.40 kg of 35% hydrochloric acid, 270 kg of alkaline stannic oxide aqueous sol prepared in A-1-2 (10.8 kg as SnO ₂ ) were added, and the stirring was 10%. Continued for a minute. The mixed liquid was a sol having a ZrO ₂ / SnO ₂ weight ratio of 0.15 and having a colloidal color and good transparency.
The prepared liquid mixture was heat-treated at 95 ° C. for 5 hours with stirring to obtain 779.2 kg of a stannic oxide-zirconium oxide composite sol. The sol had 1.38% by weight SnO _{2, 0.21%} by weight as ZrO _2, was 1.59 wt% as SnO ₂ + ZrO 2.
(B) Step: 1050 g (containing 10 g as Sb ₂ O ₅ + SiO ₂ ) containing an aqueous colloidal solution of antimony pentoxide-silica composite obtained in B-2-1 and an oligomer thereof under stirring ( b) 1111 g (containing 50 g of SnO ₂ + ZrO ₂ ) of the stannic oxide-zirconium oxide composite sol obtained in the step is set at a weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / (SnO ₂ + ZrO ₂ ) of 0. The mixture was gradually added and mixed to a ratio of 2.
Step (c): The aqueous medium obtained in Step (b) was stirred at 20 to 30 ° C. for 1 hour.
Step (d): The anion (Cl ⁻ ) contained in the sol was removed by passing the mixed sol-like slurry obtained in the step (c) through a column filled with a hydroxyl group-type anion exchange resin. . Next, this sol obtained by aging at 90 to 95 ° C. for 2 to 3 hours to obtain a modified stannic oxide-zirconium oxide composite sol was a sol having a pH of 8.00 and good transparency.

The obtained modified stannic oxide-zirconium oxide composite aqueous sol (dilute liquid) was continuously passed through a column filled with a cation exchange resin and a column filled with an anion exchange resin, It concentrated by the ultrafiltration membrane filtration apparatus of the molecular weight cut off 50,000, and obtained 517g of high concentration modified stannic oxide-zirconium oxide composite aqueous sol. This sol was stable at a pH of 3.15 and a total metal oxide concentration of 11.6% by weight.
The aqueous sol was obtained by distilling off water while gradually adding 8 L of methanol at a liquid temperature of 30 ° C. or lower under reduced pressure using a rotary evaporator with 517 g of the above modified stannic oxide-zirconium oxide composite aqueous sol having a high concentration. 190 g of a modified stannic oxide-zirconium oxide complex methanol sol substituted with methanol was obtained. The modified stannic oxide-zirconium oxide complex methanol sol obtained by adjusting the filtration concentration of this sol has a particle diameter of 10 to 15 nm by electron microscope observation, a specific gravity of 1.024, and a viscosity of 2.5 c. p. PH 2.77 (equal mixture with water), transmittance 79%, concentration in terms of metal oxide was 25% by weight and moisture 0.76% by weight. This sol had a colloidal color, high transparency, and was stable with no abnormalities such as precipitate formation, white turbidity, and thickening even after standing at room temperature for 3 months. The refractive index of this sol was 1.8.

Example 9
18.1 g of glycolic acid was added to and dissolved in 1.2 kg of the methanol sol of the modified stannic oxide-zirconium oxide composite obtained in Example 5 and allowed to stand overnight. The obtained sol had a specific gravity of 1.090 and a viscosity of 2.9 c. p. , PH 5.7, and stable at a total metal oxide concentration of 30.1% by weight.

Example 10
31.5 g of glycolic acid was added to and dissolved in 2.18 kg of methanol sol of the modified stannic oxide-zirconium oxide composite obtained in Example 6 and allowed to stand overnight. The obtained sol had a specific gravity of 1.086 and a viscosity of 2.8 c. p. , PH 5.8, and stable at a total metal oxide concentration of 30.1% by weight.

Example 11
To 33.0 kg of the highly modified stannic oxide-zirconium oxide composite obtained in the step (d) of Example 5 was gradually added 237 g of tartaric acid and 88 g of diisopropylamine under strong stirring, followed by stirring for 1 hour. Continued. Modified stannic oxide in which the aqueous sol was replaced with methanol by distilling off water while gradually adding about 400 L of methanol at a liquid temperature of 80 ° C. or less under a slightly reduced pressure on a rotary evaporator. 22 kg of zirconium oxide composite methanol sol was obtained. The obtained sol had a specific gravity of 1.102 and a viscosity of 3.1 c. p. , PH 8.2, and stable at a total metal oxide concentration of 30.7 wt%.

Example 12
148 g of tartaric acid and 35 g of diisopropylamine were gradually added under strong stirring to 28.5 kg of the stannic oxide-zirconium oxide complex modified to a high concentration obtained in the step (d) of Example 6 and stirred for 1 hour. Continued. Modified stannic oxide in which the aqueous sol was replaced with methanol by distilling off water while gradually adding about 400 L of methanol at a liquid temperature of 80 ° C. or less under a slightly reduced pressure on a rotary evaporator. 22 kg of zirconium oxide composite methanol sol was obtained. The obtained sol had a specific gravity of 1.100 and a viscosity of 2.0 c. p. , PH 7.5, and stable at a total metal oxide concentration of 30.6% by weight.

Example 13
5.9 g of glycolic acid was added to and dissolved in 1.3 kg of the methanol sol of the modified stannic oxide-zirconium oxide composite obtained in Example 11 and allowed to stand overnight. The obtained sol had a specific gravity of 1.094 and a viscosity of 1.6 c. p. , PH 5.2, and stable at a total metal oxide concentration of 30.3% by weight.

Example 14
3.9 g of glycolic acid was added to and dissolved in 0.76 kg of the methanol sol of the modified stannic oxide-zirconium oxide composite obtained in Production Example 12, and allowed to stand overnight. The obtained sol had a specific gravity of 1.094 and a viscosity of 1.4 c. p. , PH 4.8, stable at a total metal oxide concentration of 30.4% by weight.

Example 15
The stannic oxide colloid of component A-1-1 of Example 1 was mixed with component A-1-5 so that the weight ratio of (B) / (A) converted to metal oxide was mixed to 0.1. 1401 g of stannic oxide colloid contains an aqueous medium containing an alkali component-containing antimony pentoxide colloid and its oligomer as a B-1-1 component, and an alkali component-containing antimony pentoxide colloid and its oligomer as a B-1-2 component This was carried out in the same manner as in Example 1 except that the aqueous medium was changed to 277.8 g.

  The resulting modified high concentration stannic oxide aqueous sol has a pH of 11.1 and a viscosity of 2.5 c. p. The concentration in terms of metal oxide was stable at 13.5% by weight.

  Water of the aqueous sol was removed by distilling off 392 g of the above-modified stannic oxide aqueous sol having a high concentration with a rotary evaporator under reduced pressure while adding 9 liters of methanol little by little at a liquid temperature of 30 ° C. or less. 173 g of modified stannic oxide methanol sol substituted with methanol was obtained. This sol has a specific gravity of 1.091, a pH of 8.7 (equal mixture with water), a viscosity of 1.0 cp, a concentration converted to a metal oxide of 30% by weight, a water content of 1.9% by weight, and a particle size by electron microscope observation. Was 10-15 nm. The sol had a colloidal color, high transparency, and was stable with no abnormalities such as precipitate formation, white turbidity, and thickening after standing at room temperature for 3 months. The refractive index of the dried sol was 1.95.

Example 16
The stannic oxide colloid of component A-1-1 of Example 1 was mixed with component A-1-5 so that the weight ratio of (B) / (A) converted to metal oxide was mixed to 0.2. An aqueous medium containing an alkali component-containing antimony pentoxide colloid and an oligomer thereof as B-1-1 component to 5373 g of stannic oxide colloid, an alkali component-containing antimony pentoxide-silica composite colloid as B-2-1 component, and its The same procedure as in Example 1 was performed except that the aqueous medium containing the oligomer was changed to 503 g.

  The resulting modified high concentration stannic oxide aqueous sol has a specific gravity of 1.222, a pH of 3.2, a viscosity of 2.1 c. p. The concentration in terms of metal oxide was stable at 19.8% by weight.

  Modification by replacing water in the aqueous sol with methanol by distilling off water while adding 21 liters of methanol little by little with a rotary evaporator under slightly reduced pressure on 2160 g of the above modified stannic oxide aqueous sol having a high concentration. As a result, 1360 g of stannic oxide methanol sol was obtained. This sol has a specific gravity of 1.083, a pH of 6.8 (equal mixture with water), a viscosity of 1.2 cp, a concentration in terms of metal oxide of 30% by weight, a water content of 2.0% by weight, and a particle size by electron microscope observation. Was 10-15 nm. The sol had a colloidal color, high transparency, and was stable with no abnormalities such as precipitate formation, white turbidity, and thickening after standing at room temperature for 3 months. The refractive index of the dried sol was 1.95.

    The sol of the present invention is particularly effective as a component for improving the refractive index, dyeability, chemical resistance, water resistance, moisture resistance, light resistance, weather resistance, abrasion resistance and the like for forming a hard coat film on a plastic lens. However, it can be used for various other purposes.

  By applying this sol to the surface of organic fibers, fiber products, paper, etc., the flame retardancy, anti-slip property, antistatic property, dyeability and the like of these materials can be improved. Moreover, these sols can be used as binders for ceramic fibers, glass fibers, ceramics, and the like. Furthermore, by mixing and using in various paints, various adhesives, etc., the water resistance, chemical resistance, light resistance, weather resistance, abrasion resistance, flame resistance, etc. of those cured coating films can be improved. . In addition, these sols can generally be used as surface treatment agents for metal materials, ceramic materials, glass materials, plastic materials and the like. Further, it is useful as a catalyst component.

Claims (14)

Stannic oxide particles or composite particles of stannic oxide particles and zirconium oxide particles, wherein these oxides are in a ratio of 0: 1 to 0.50: 1 as ZrO ₂ : SnO ₂ based on weight Alkyl having a molar ratio of M / Sb ₂ O ₅ of 0.02 to 4.00 (where M represents an amine molecule) with the surface of colloidal particles (A) having a particle diameter of 4 to 50 nm as nuclei. Coated with amine-containing Sb ₂ O ₅ colloidal particles, oligomers thereof, or mixtures thereof (B1), and the weight ratio of (B1) / (A) is 0.01-0 based on the weight ratio of the metal oxides A sol containing modified metal oxide particles in a ratio of .50 and having a particle size of 4.5-60 nm. The sol according to claim 1, wherein the colloidal particles (A) are stannic oxide. The colloidal particles (A) are composite colloidal particles of stannic oxide particles and zirconium oxide particles having a ZrO ₂ : SnO ₂ weight ratio of 0.05: 1 to 0.50: 1. Sol. Stannic oxide particles or composite particles of stannic oxide particles and zirconium oxide particles, wherein these oxides are in a ratio of 0: 1 to 0.50: 1 as ZrO ₂ : SnO ₂ based on weight Composite colloidal particles of antimony pentoxide and silica having a molar ratio of SiO ₂ / Sb ₂ O ₅ having a surface diameter of 0.55 to 55 using colloidal particles (A) having a particle diameter of 4 to 50 nm as nuclei, and oligomers thereof Or a mixture thereof (B2) and the weight ratio of (B2) / (A) is a ratio of 0.01 to 0.50 based on the weight ratio of the metal oxides and 4.5 A sol containing modified metal oxide particles having a particle size of ˜60 nm. The sol according to claim 4, wherein the colloidal particles (A) are stannic oxide. The colloidal particles (A) are composite colloidal particles of stannic oxide particles and zirconium oxide particles having a ZrO ₂ : SnO ₂ weight ratio of 0.05: 1 to 0.50: 1. Sol. The following (a1) step, (b1) step, and (c1) step:
(A1) Step: Adjusting a stannic oxide aqueous sol containing colloidal particles of stannic oxide having a particle diameter of 4 to 50 nm as SnO _{2 at} a concentration of 1 to 50% by weight;
Step (b1): The molar ratio of the stannic oxide aqueous sol obtained in Step (a1) to M / Sb ₂ O ₅ of 0.02 to 4.00 (where M represents an amine molecule). The alkylamine-containing Sb ₂ O ₅ colloidal particles, the oligomer thereof, or the aqueous medium containing the mixture thereof having a weight ratio of Sb ₂ O ₅ / SnO ₂ in terms of the metal oxide is 0.01 to 0.00. And (c1) step: aging the aqueous medium obtained in step (b1) at 20 to 300 ° C. for 0.1 to 50 hours. A method for producing a stable sol of modified stannic oxide colloidal particles. The following (a2) step, (b2) step, (c2) step and (d2) step:
Step (a2): a stannic oxide aqueous sol having a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight, and an oxyzirconium concentration of 0.5 to 50% by weight in terms of ZrO ₂ An aqueous salt solution was mixed in a weight ratio of 0.05 to 0.50 as ZrO ₂ / SnO ₂ , and the resulting mixture was heated at 60 to 100 ° C. for 0.1 to 50 hours to give 4 Preparing a stannic oxide-zirconium oxide composite aqueous sol having a particle diameter of ˜50 nm;
Step (b2): Molar ratio of stannic oxide-zirconium oxide composite aqueous sol obtained in step (a2) and M / Sb ₂ O ₅ of 0.02 to 4.00 (where M is an amine molecule) The weight of Sb ₂ O ₅ / (SnO ₂ + ZrO ₂ ) in terms of the metal oxide of the aqueous medium containing the alkylamine-containing Sb ₂ O ₅ colloidal particles, oligomers thereof, or mixtures thereof having Mixing at a ratio of 0.01 to 0.50,
(C2) step: a step of aging the aqueous medium obtained in step (b2) at 20 to 300 ° C. for 0.1 to 50 hours; and
Step (d2): A step of removing anions present in the sol by bringing the modified stannic oxide-zirconium oxide composite aqueous sol obtained in step (c2) into contact with an anion exchanger. A method for producing a stable sol of the modified stannic oxide-zirconium oxide composite colloidal particles according to claim 1 or 3. The following (a3) step, (b3) step, and (c3) step:
(A3) step: a step of adjusting a stannic oxide aqueous sol that is hydrothermally treated at a temperature of 100 to 300 ° C. and has a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight;
Step (b3): The molar ratio of the aqueous stannic oxide sol obtained in Step (a3) to M / Sb ₂ O ₅ of 0.02 to 4.00 (where M represents an amine molecule). The aqueous solution containing the alkylamine-containing Sb ₂ O ₅ colloidal particles, oligomers thereof, or mixtures thereof having a weight ratio of Sb ₂ O ₅ / SnO ₂ in terms of the metal oxide is 0.01-0. And (c3) step: aging the aqueous medium obtained in step (b3) at 20 to 300 ° C. for 0.1 to 50 hours. A method for producing a stable sol of modified stannic oxide colloidal particles. The following (a4) step, (b4) step, (c4) step and (d4) step:
(A4) Step: Hydrothermally treated at a temperature of 100 to 300 ° C., converted into ZrO ₂ , and a stannic oxide aqueous sol having a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight. And an aqueous solution of an oxyzirconium salt having a concentration of 0.5 to 50% by weight as ZrO ₂ / SnO ₂ in a weight ratio of 0.05 to 0.50, and the resulting mixture at 60 to 100 ° C. A step of preparing a stannic oxide-zirconium oxide composite aqueous sol having a particle size of 4 to 50 nm by heating for 0.1 to 50 hours;
Step (b4): A molar ratio of the stannic oxide-zirconium oxide composite aqueous sol obtained in Step (a4) and M / Sb ₂ O ₅ of 0.02 to 4.00 (where M is an amine molecule) The weight of Sb ₂ O ₅ / (SnO ₂ + ZrO ₂ ) in terms of the metal oxide of the aqueous medium containing the alkylamine-containing Sb ₂ O ₅ colloidal particles, oligomers thereof, or mixtures thereof having Mixing at a ratio of 0.01 to 0.50,
(C4) step: a step of aging the aqueous medium obtained in step (b4) at 20 to 300 ° C. for 0.1 to 50 hours; and
Step (d4): A step of removing anions present in the sol by bringing the modified stannic oxide-zirconium oxide composite aqueous sol obtained in step (c4) into contact with an anion exchanger. A method for producing a stable sol of the modified stannic oxide-zirconium oxide composite colloidal particles according to claim 1 or 3. The following (a5) step, (b5) step, and (c5) step:
(A5) Step: Adjusting a stannic oxide aqueous sol containing colloidal particles of stannic oxide having a particle diameter of 4 to 50 nm as SnO _{2 at} a concentration of 1 to 50% by weight;
Step (b5): a composite colloidal particle of antimony pentoxide and silica having a molar ratio of stannic oxide aqueous sol obtained in the step (a5) and SiO ₂ / Sb ₂ O ₅ of 0.55 to 55, A step of mixing the oligomer or an aqueous medium containing a mixture thereof in a weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / (SnO ₂ ) in terms of the metal oxide to 0.01 to 0.50. And the step (c5): aging the aqueous medium obtained in the step (b5) at 20 to 300 ° C. for 0.1 to 50 hours, A method for producing a stable sol of colloidal particles of tin. The following (a6) step, (b6) step, (c6) step and (d6) step:
Step (a6): a stannic oxide aqueous sol having a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight, and an oxyzirconium concentration of 0.5 to 50% by weight in terms of ZrO ₂ An aqueous salt solution was mixed in a weight ratio of 0.05 to 0.50 as ZrO ₂ / SnO ₂ , and the resulting mixture was heated at 60 to 100 ° C. for 0.1 to 50 hours to give 4 Preparing a stannic oxide-zirconium oxide composite aqueous sol having a particle diameter of ˜50 nm;
(B6) step: (a6) stannic oxide obtained in step - zirconium oxide composite aqueous sol, the diantimony pentaoxide and silica having a molar ratio of _SiO 2 / _Sb 2 _{O 5} of 0.55 to 55 The aqueous medium containing the composite colloidal particles, the oligomer thereof, or the mixture thereof is 0.01 to 0 by weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / (SnO ₂ + ZrO ₂ ) in terms of the metal oxide. Mixing to 50;
Step (c6): Step of aging the aqueous medium obtained in Step (b6) at 20 to 300 ° C. for 0.1 to 50 hours, and
Step (d6): A step of removing anions present in the sol by bringing the modified stannic oxide-zirconium oxide composite aqueous sol obtained in step (c6) into contact with an anion exchanger. A method for producing a stable sol of the modified stannic oxide-zirconium oxide composite colloidal particles according to claim 4 or 6. The following (a7) step, (b7) step, and (c7) step:
(A7) Step: Adjusting a stannic oxide aqueous sol that is hydrothermally treated at a temperature of 100 to 300 ° C. and has a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight;
(B7) step: a composite colloidal particle of antimony pentoxide and silica having a molar ratio of stannic oxide aqueous sol obtained in the above step (a7) and SiO ₂ / Sb ₂ O ₅ of 0.55 to 55, A step of mixing the oligomer or an aqueous medium containing a mixture thereof in a weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / (SnO ₂ ) in terms of the metal oxide to 0.01 to 0.50. And (c7) step: a step of aging the aqueous medium obtained in step (b7) at 20 to 300 ° C. for 0.1 to 50 hours, A method for producing a stable sol of colloidal particles of tin. The following (a8) step, (b8) step, (c8) step and (d8) step:
Step (a8): hydrothermally treated at a temperature of 100 to 300 ° C., converted into ZrO ₂ , and a stannic oxide aqueous sol having a particle diameter of 4 to 50 nm and a SnO ₂ concentration of 0.5 to 50% by weight. And an aqueous solution of an oxyzirconium salt having a concentration of 0.5 to 50% by weight as ZrO ₂ / SnO ₂ in a weight ratio of 0.05 to 0.50, and the resulting mixture at 60 to 100 ° C. A step of preparing a stannic oxide-zirconium oxide composite aqueous sol having a particle size of 4 to 50 nm by heating for 0.1 to 50 hours;
(B8) step: (a8) stannic oxide obtained in step - zirconium oxide composite aqueous sol, the diantimony pentaoxide and silica having a molar ratio of _SiO 2 / _Sb 2 _{O 5} of 0.55 to 55 The aqueous medium containing the composite colloidal particles, the oligomer thereof, or the mixture thereof is 0.01 to 0 by weight ratio of (Sb ₂ O ₅ + SiO ₂ ) / (SnO ₂ + ZrO ₂ ) in terms of the metal oxide. Mixing to 50;
(C8) step: a step of aging the aqueous medium obtained in step (b8) at 20 to 300 ° C. for 0.1 to 50 hours; and
Step (d8): A step of removing anions present in the sol by bringing the modified stannic oxide-zirconium oxide composite aqueous sol obtained in step (c8) into contact with an anion exchanger. A method for producing a stable sol of the modified stannic oxide-zirconium oxide composite colloidal particles according to claim 4 or 6, comprising: