JPH0543837A - Zro2-sio2-cao coating composition - Google Patents

Abstract

PURPOSE:To prepare a coating compsn. which can be applied easily, is storable for a long time, and gives a coating film excellent in stability by compounding a zirconium tetraalkoxide stabilized with a specific alcohol compd., a silane compd., a calcium compd., and an org. solvent. CONSTITUTION:The title compsn. comprises a zirconium tetraalkoxide of formula I (wherein R<1> is 1-5C alkyl), a silane compd. of formula II, III, IV, or V (wherein R<2> is 1-5C alkyl; and R<3>, R<4> and R<5> are each an org. group), a calcium compd. selected from the group consisting of calcium nitrate, calcium chlorate, and calcium perchlorate, an alcohol compd. selected from the group consisting of a 2-oxyalcohol, a 2-oxoalcohol, a 3-oxyalcohol, a alpha-oxoalcohol, an alpha-diol, and a beta-diol, and an org. solvent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is directed to ZrO ₂ --SiO ₂ --Ca.
The present invention relates to an O-based coating composition.

[0002]

2. Description of the Related Art Conventionally, metal, plastic, wood, paper,
Heat resistance, abrasion resistance, and heat resistance on materials such as cement and graphite.
In order to improve water resistance, chemical resistance, etc., a coating film is formed by coating, and a typical coating method is, for example, an organic method using a silicone resin as a binder. Coating with paint can be mentioned. However, the coating film obtained from the above organic coating is
It has poor heat resistance and cannot withstand long-term use in an atmosphere of 200 ° C or higher.

On the other hand, it has been proposed to coat a ceramic thin film having heat resistance on a material, and at present, it is mainly applied to a metal material. Examples of the coating method include vapor deposition method, sputtering method, CVD method,
Examples of the coating method include the thermal spraying method and the like.
There is a drawback that the material, size, shape and the like of the raw material are largely limited and the coating operation is complicated.

In order to solve the above-mentioned drawbacks, there has been proposed a zircon composition which has no limitation on the material and which can be easily coated on the material having various sizes and shapes. JP 61-250063 discloses Zr.
A composition obtained by mixing a zirconium compound represented by (OC ₄ H ₉ ) ₄ , ethyl silicate and isopropyl alcohol is described, and JP-A-63-190175 discloses a composition.
A composition consisting of a zirconium oxyacid salt, a silicon alkoxide or a derivative thereof, water and an organic solvent is described. However, the above composition has a drawback that the long-term storage stability is poor, and that the coating film obtained by coating on the material is apt to cause cracks and peeling.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and an object thereof is to enable easy coating and obtain a coating film having excellent stability and long-term storability. An object is to provide a ZrO ₂ —SiO ₂ —CaO based coating composition.

[0006]

The zirconium tetraalkoxide (a) used in the present invention has the general formula Zr (OR
¹ ) ₄ is a compound represented by the formula, wherein R ¹ represents an alkyl group, but when the number of carbon atoms increases, ZrO ₂ —SiO ₂ —CaO
The number of carbon atoms is limited to 1 to 5 because the stability of the system coating composition is lowered and the long-term storage property is deteriorated.

The above zirconium tetraalkoxide (a)
As, for example, zirconium tetramethoxide, zirconium tetraethoxide, zirconium tetra-n-
Examples include propoxide, zirconium tetra-iso-propoxide, zirconium tetra-n-butoxide, zirconium tetra-sec-butoxide, zirconium tetra-tert-butoxide, and the like, particularly zirconium tetra-n-butoxide and zirconium tetra-iso-propoxy. Is preferred. These may be used alone or in combination of two or more.

The silane compound (b) used in the present invention is a compound represented by the following general formula [I], [II], [III] or [IV].

[0009]

[Chemical 2]

In the formula, R ² represents an alkyl group. However, when the carbon number increases, the stability of the ZrO ₂ —SiO ₂ —CaO coating composition decreases and the long-term storage stability deteriorates. Is limited to 1-5. R ³ , R ⁴ and R ⁵ represent organic groups, for example, saturated hydrocarbon groups (alkyl groups, substituted alkyl groups, etc.), unsaturated hydrocarbon groups (allyl groups, vinyl groups, etc.), aromatic hydrocarbon groups ( Phenyl group, naphthyl group, etc.), epoxy group, amino group and the like.

As the compound represented by the general formula [I],
For example, tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetra-iso-
Examples thereof include propoxysilane, tetra-n-butoxysilane, tetra-sec-butoxysilane, tetra-tert-butoxysilane, and the like. Examples of the compound represented by the general formula [II] include monomethyltrimethoxysilane and
Monomethyltriethoxysilane, monomethyltri-n-
Propoxysilane, monomethyltri-iso-propoxysilane, monomethyltri-n-butoxysilane, monomethyltri-sec-butoxysilane, monomethyltri-tert-butoxysilane, ethyltriethoxysilane, vinyltriethoxysilane, phenyltriethoxysilane, Examples thereof include epoxytriethoxysilane, and examples of the compound represented by the general formula [III] include dimethyldimethoxysilane, dimethyldiethoxysilane, dimethyldi-n-propoxysilane, and dimethyldi-iso.
-Propoxysilane, dimethyldi-n-butoxysilane, dimethyldi-sec-butoxysilane, dimethyldi-tert-butoxysilane, diethyldiethoxysilane, ethylvinyldiethoxysilane, ethylphenyldiethoxysilane, methylepoxydiethoxysilane, etc. Examples of the compound represented by the general formula [IV] include trimethylmonomethoxysilane, trimethylmonoethoxysilane, trimethylmono-n-propoxysilane, trimethylmono-iso-propoxysilane, and trimethylmono-n-butoxysilane. , Trimethylmono-s
ec-Butoxysilane, trimethyl mono-tert-butoxy silane, triethyl ethoxy silane, diethyl vinyl ethoxy silane, diethyl phenyl ethoxy silane, diethyl phenyl ethoxy silane, methyl ethyl epoxy ethoxy silane, etc. are mentioned, Especially tetra ethoxy silane, monomethyl tri ethoxy. Silane, dimethyldiethoxysilane, vinyltriethoxysilane and diethylphenylethoxysilane are preferred.

The silane compound (b) may be used alone or in combination of two or more kinds. When the amount of the silane compound (b) added to the zirconium tetraalkoxide (a) decreases, ZrO ₂ —SiO ₂ —CaO-based co-
The silane compound (b) / zirconium tetraalkoxide (a) (molar ratio) is less than 0.1 because the stability of the coating composition decreases and the long-term storage property deteriorates, and the more the coating composition is obtained, the more easily cracks occur. 01-9 are preferable, More preferably, it is 0.1-8.

Calcium compound (c) used in the present invention
Is a compound selected from the group consisting of calcium nitrate, calcium chlorate and calcium perchlorate, and examples of the calcium compound (c) include anhydrous calcium nitrate, calcium nitrate dihydrate, anhydrous calcium chlorate, and chlorine. Examples thereof include calcium acid dihydrate, anhydrous calcium perchlorate, and calcium perchlorate tetrahydrate, and anhydrous calcium nitrate, anhydrous calcium chlorate and anhydrous calcium perchlorate are particularly preferable. These may be used alone or in combination of two or more.

If the amount of the calcium compound (c) added to the zirconium tetraalkoxide (a) is small or large, cracks are likely to occur in the coating film obtained, so that the calcium compound (c) / zirconium tetraalkoxide may be cracked. The alkoxide (a) (molar ratio) is preferably 0.01 to 9, and more preferably 0.1 to 8.0.

The alcohol compound (d) used in the present invention
Is 2-oxyalcohol, 2-oxoalcohol, 3
-One or more compounds selected from the group consisting of oxyalcohol, 3-oxoalcohol, α-diol and β-diol.

Examples of the 2-oxyalcohol include 2-methoxyethanol and 2-ethoxyethanol.
And 2- (1-methylethoxy) ethanol, 1-methoxy-2-propanol, diethylene glycol, tetrahydrofurfuryl alcohol and the like. Examples of 2-oxo alcohol include 2 -Oxo-1-propanol, furfural, ethyl lactate, and the like, including 3
Examples of -oxyalcohol include 3-methoxypropanol and 2- (2-hydroxyethyl) furan, and examples of 3-oxoalcohol include 2
-Oxo-1-butanol, ethyl 3-hydroxybutyrate and the like, and examples of α-diol include ethylene glycol, propylene glycol and the like, β
Examples of the diol include propanediol, butanediol, 2,4-pentanediol and the like.

When the amount of the above-mentioned alcohol compound (d) added to the zirconium tetraalkoxide (a) is small, the stability of the ZrO ₂ --SiO ₂ --CaO coating composition is lowered and the long-term storage stability is poor. Since the cracks are likely to occur in the coating film obtained when the amount is large, the alcohol compound (d) / zirconium tetraalkoxide (a) (molar ratio) is preferably 0.5 to 6.

The organic solvent (e) used in the present invention is particularly compatible as long as it is compatible with the zirconium tetraalkoxide (a) and the silane compound (b) and the calcium compound (c) exhibits solubility. It is not limited, and examples thereof include alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, and butyl alcohol, ketones such as acetone and methyl ethyl ketone, and tetrahydrofuran, and especially methyl alcohol. , Ethyl alcohol and isopropyl alcohol are preferred. These may be used alone or in combination of two or more.

When the amount of the organic solvent (e) added is reduced, the stability of the ZrO ₂ --SiO ₂ --CaO coating composition is lowered and the long-term storage stability is deteriorated. Since pinholes are likely to occur, organic solvents
(e) / [zirconium tetraalkoxide (a) + silane compound (b) + calcium compound (c)] (molar ratio) is 0.
05-500 is preferable and more preferably 0.2-30
It is 0.

The method for producing the ZrO ₂ —SiO ₂ —CaO based coating composition of the present invention is not particularly limited, and examples thereof include a method of mixing the above-mentioned constituent materials at once and a specific constituent material. Examples of the method include the method of adding and mixing the remaining constituent materials after dividing and mixing, but the latter method is preferable, for example, zirconium tetraalkoxide (a) as a specific constituent material, amine compound (d) A method is used in which the silane compound (b) and the calcium compound (c) are added after mixing the organic solvent (e) and the organic solvent (e).

The composition of the ZrO ₂ --SiO ₂ --CaO coating composition of the present invention is as described above, but it promotes hydrolysis of all alkoxides (zirconium tetraalkoxide (a) and silane compound (b)). However, water, acid, alkali or the like may be added to facilitate the formation of the coating film.

In order to further improve the stability (crack resistance, peeling resistance, etc.) of the obtained coating film, Zr, S
oxide powder of i, Ca, etc. (for example, ZrO ₂ , Si
O ₂ , CaO, CaZrO ₃ , ZrSiO ₄ , Ca ₃ Si ₂
Powder such as ZrO ₉ ) may be added.

If the average particle size of the oxide powder is small, it becomes difficult to disperse it in the ZrO ₂ —SiO ₂ —CaO coating composition, and if it is large, cracks are likely to occur in the obtained coating film. , 0.01 to 100 μm is preferable, and 0.02 to 10 μm is particularly preferable.

ZrO ₂ --SiO ₂ --CaO of the above oxide powder
When the amount added to the system coating composition is small, the degree of improvement in the stability of the obtained coating film is low, and when it is large, the stability of the ZrO ₂ —SiO ₂ —CaO system coating composition is reduced. As a result, the long-term storability deteriorates, so all ZrO _2-
SiO ₂ -CaO oxide (zirconium tetraalkoxide (a), silane compound (b) and calcium compound
The total amount of the oxide formed from (c) and the above oxide powder) is preferably 1 to 60% by weight. The oxide powder is preferably added after mixing the constituent materials of the ZrO ₂ —SiO ₂ —CaO based coating composition.

The ZrO ₂ —SiO ₂ —CaO based coating composition of the present invention is applied or impregnated on the above material and dried to form a ZrO ₂ —SiO ₂ —CaO based oxide film. The coating method is not particularly limited, and examples thereof include brush, spray coat, dip coat,
Examples of coating methods include spin coating and roll coating.

The above-mentioned impregnation method is not particularly limited, and examples thereof include a method of immersion impregnation under normal pressure, a method of immersion impregnation under reduced pressure, and the like. Immersion impregnation under reduced pressure is preferable.

The drying method is not particularly limited, and may be naturally dried at room temperature or may be dried by heating. Moreover, after drying, you may heat-process at high temperature as needed.

[0028]

EXAMPLES Examples of the present invention will be described below. The methods for evaluating the physical properties of the ZrO ₂ —SiO ₂ —CaO based coating composition shown in the results are as follows.

(1) Initial Adhesion A slide glass (manufactured by Matsunami Co., Ltd.) ultrasonically cleaned with acetone is dipped in the obtained ZrO ₂ —SiO ₂ —CaO coating composition, and the speed is 300 mm / min. And then dried under the following conditions to form a ZrO ₂ —SiO ₂ —CaO-based oxide coating layer to prepare an evaluation sample.
A cross-cut tape peeling test was performed according to the above, and the ratio (adhesion ratio) of the remaining meshes to the meshes of 100 ZrO ₂ —SiO ₂ —CaO-based oxide coating layers was measured and evaluated.

(Drying conditions) Initial drying: 25 ° C., 24 hours Final drying: 500 ° C. (temperature rising from 25 ° C. to 50 ° C./hr),
Hold for 2 hours

(2) Pencil hardness Using the obtained ZrO ₂ —SiO ₂ —CaO coating composition, an evaluation sample was prepared in the same manner as in the case of evaluating the above initial adhesion, and in accordance with JIS K 5400. Was measured.

(3) Boiling water resistance (crack resistance and adhesion durability) Using the obtained ZrO ₂ —SiO ₂ —CaO coating composition, the initial adhesion was evaluated in the same manner as described above. The prepared evaluation sample was immersed in boiling water for 8 hours, and then the surface state was subjected to a sensory test to evaluate crack resistance according to the following criteria.

(Judgment Criteria) ◯: No cracks on the surface x: Cracks on the surface After performing the above-mentioned sensory test, a cross-cut tape peeling test was performed in the same manner as in the case of evaluating the above-mentioned initial adhesion, and the adhesion was determined. The adhesion durability was evaluated by the rate.

(4) Acid resistance (crack resistance and adhesion durability) Using the obtained ZrO ₂ —SiO ₂ —CaO coating composition, it was prepared in the same manner as in the case of evaluating the above initial adhesion. The evaluation sample was immersed in hydrochloric acid of 20 wt% for 75 hours, and the surface condition was sensory-tested to evaluate crack resistance according to the following criteria.

(Judgment Criteria) ◯: No cracks on the surface x: Cracks on the surface After performing the above-mentioned sensory test, a cross-cut tape peeling test was performed in the same manner as in the case of evaluating the above-mentioned initial adhesion, and the adhesion was determined. The adhesion durability was evaluated by the rate.

(5) Long-term storability The sealed container containing the obtained ZrO ₂ —SiO ₂ —CaO coating composition was left standing in an atmosphere of 50 ° C. and 65% RH for 3 months, and then the above-mentioned initial An evaluation sample was prepared in the same manner as the evaluation of the adhesiveness, a cross-cut tape peeling test was performed, and the long-term storability was evaluated according to the following criteria.

(Judgment Criteria) A: Adhesion rate exceeds 80% X: Adhesion rate is 80% or less

(Examples 1 to 19) A predetermined amount of zirconium tetraalkoxide and alcohol shown in Tables 1 and 2 were used.
The compound and ethyl alcohol were fed to a separable flask and stirred at room temperature for 15 hours at a stirring speed of 800 rpm to obtain a stabilized zirconium tetraalkoxide alcohol solution.

The obtained alcohol solution was added to Table 1 and Table 2.
The prescribed amount of the silane compound shown in was added, and the mixture was stirred at room temperature for 5 hours at a stirring speed of 800 rpm.
Then, a predetermined amount of the calcium compound shown in Table 2 was added, and the mixture was stirred at room temperature for 24 hours at a stirring speed of 800 rpm to obtain Z.
An rO ₂ —SiO ₂ —CaO based coating composition was obtained.

Using the obtained ZrO ₂ —SiO ₂ —CaO coating composition, each physical property was measured based on the above-mentioned measuring method, and the results are shown in Tables 1 and 2.

Example 20 The procedure of Example 1 was repeated except that 1 molar equivalent of aqueous hydrochloric acid solution (concentration: 3 mol / l) was added.
A ZrO ₂ —SiO ₂ —CaO based coating composition was obtained in the same manner as in Example 1. The obtained ZrO ₂ —SiO ₂ —CaO
Based on the above measurement method using a system coating composition,
Each physical property was measured, and the results are shown in Table 2.

Example 21 A ZrO ₂ —SiO ₂ —CaO based coating composition obtained in the same manner as in Example 1 was added,
An amount of Ca corresponding to 10% by weight in the total ZrO ₂ —SiO ₂ —CaO-based oxide (the total amount of oxides formed from zirconium tetraalkoxide, silane compound and calcium compound, and Ca ₃ Si ₂ ZrO ₉ powder) ₃ Si ₂ ZrO
₉ powders (average particle size 1 μm) were added, and the mixture was stirred at room temperature for 1 hour at a stirring speed of 1000 rpm to obtain a Ca ₃ Si ₂ ZrO ₉ powder-containing ZrO ₂ —SiO ₂ —CaO coating composition. The obtained Ca ₃ Si ₂ ZrO ₉ powder-containing ZrO ₂ -SiO
_{Using the 2-} CaO-based coating composition, each physical property was measured based on the above-mentioned measurement method, and the results are shown in Table 2.

(Embodiment 22) In Embodiment 21, all Z
An amount of Ca ₃ corresponding to 40% by weight in the rO ₂ —SiO ₂ —CaO-based oxide (the total amount of oxides formed from zirconium tetraalkoxide, silane compound and calcium compound, and Ca ₃ Si ₂ ZrO ₉ powder) Ca ₃ Si _{2 was} prepared in the same manner as in Example 22 except that Si ₂ ZrO ₉ powder was added.
A ZrO ₂ —SiO ₂ —CaO based coating composition containing ZrO ₉ powder was obtained. The obtained Ca ₃ Si ₂ ZrO ₉ powder containing Z
Using the rO ₂ —SiO ₂ —CaO coating composition,
Each physical property was measured based on the above-mentioned measuring method, and the results are shown in Table 2.

[0044]

[Table 1]

[0045]

[Table 2]

(Comparative Examples 1 to 7)
Ruconium tetraalkoxide, alcohol compound,
Cyl alcohol, silane compound and calcium compound
In the same manner as in Example 1, using ZrO₂-SiO₂-CaO
A system coating composition was obtained. The obtained ZrO ₂-SiO
₂-Using the CaO-based coating composition
Based on this, each physical property was measured, and the results are shown in Table 3.

[0047]

[Table 3]

[0048]

The ZrO ₂ --SiO ₂ --CaO system copolymer of the present invention
The composition of the coating composition is as described above, and zirconium tetraalkoxide stabilized with a specific alcohol compound, and a silane compound, a calcium compound and an organic solvent are contained in specific amounts, and thus can be stored for a long period of time. Further, a coating film having excellent heat resistance, abrasion resistance, water resistance and chemical resistance can be easily formed on various materials such as metal, plastic, wood, paper, cement and graphite.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C23C 18/12 8414-4K

Claims (1)

[Claims] 1. A zirconium tetraalkoxide represented by (a) a general formula Zr (OR ¹ ) ₄ (wherein R ¹ is an alkyl group having 1 to 5 carbon atoms), and (b) the following general formula [I]: , [II], [III] or [I
A silane compound represented by V] (In the formula, R ² is an alkyl group having 1 to 5 carbon atoms, R ³ ,
(R ⁴ and R ⁵ are organic groups) (c) Calcium compound selected from the group consisting of calcium nitrate, calcium chlorate and calcium perchlorate, (d) 2-oxyalcohol, 2-oxoalcohol, 3
-Oxyalcohol, 3-oxoalcohol, an alcohol compound selected from the group consisting of α-diol and β-diol, and (e) an organic solvent, ZrO ₂ -SiO.
_2- CaO-based coating composition.