CN101760057A - Ceramic coating and preparation method thereof and method for preventing cracking of ceramic coating - Google Patents
Ceramic coating and preparation method thereof and method for preventing cracking of ceramic coating Download PDFInfo
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Abstract
The invention relates to a ceramic coating and a preparation method thereof, and a method for preventing cracking of the ceramic coating. The invention provides the ceramic coating, which comprises the following components: a component A which consists of a metal oxide sol, a coloring pigment, a lamellar pigment, an oriented auxiliary agent and water, wherein the grain diameter of the lamellar pigment is between 1 and 80mum, while the tablet diameter ratio thereof is between 5 and 100; and a component B which is prepared by mixing at least two alkoxy silanes with different hydrolysis rates, wherein the weight ratio of the component A to the component B is 2-3:1-2, and the solid content of the component A is between 20 and 45 by weight percent. The invention also provides the preparation method of the ceramic coating, and the method for preventing cracking of the ceramic coating.
Description
Technical field
The invention belongs to the chemistry painting industry field, relate to a kind of ceramic coating, its preparation method of novelty and the method that prevents ceramic film cracking.Specifically, the present invention relates to film by the inorganic ceramic of sol-gel method preparation, this films the solidifying agent (B component) be made up of the colloidal sol that contains lamellar pigment (A component), two or more organoalkoxysilane after mixing, through hydrolysis, slaking, formation has the coagulant liquid of certain viscosity,, on the metal base of sandblasting, film subsequently by the spraying paint, form the pottery that has improved the cracking thickness and film through high warm hardening.This pottery is filmed and be can be used for that the aluminum screen wall is decorated, metallic substance is anticorrosion, or the application that improves the purposes such as not viscosity, wear resistance and thermo oxidative aging of metal base.
Background technology
Be known that via the gelation process of colloidal sol to deposit/gel-film of paint substrate surface that solvent is contained in inside, need carry out drying treatment it.The drying process of wet gel generally can be observed following three phenomenons:
A) contraction of Chi Xuing and sclerosis;
B) produce stress;
C) break.
Wet gel in the drying process, is filled in the gel pore because of enough liquid phases are arranged in the early stage, and the minimizing of gel volume equates that with the volume of vaporized liquid no capillary force works.When further evaporation made the gel volume reduction less than the liquid volume that evaporates, this moment, liquid phase formed meniscus in gel pore, made gel bear a capillary pressure P, and particle is pressed together.Shown in Fig. 1-2.
If the radius-of-curvature of meniscus is r, then the kapillary contraction pressure P that causes of surface tension of liquid σ can be expressed as by Laplace formula (referring to Huang Jianfeng, " sol-gel philosophy and technique ", 60-61 page or leaf, Chemical Industry Press, in September, 2005 first version):
In the formula: σ is the liquid-gas meter surface tension of liquid, and θ is the angle of wetting between curved liquid surface and solid walls, and d is the pore diameter.
In the drying process of film, except that the evaporation of gel internal solvent, also have the polyreaction between micelle, that is, shrink or the acetal reaction.The by product of condensation, be water or alcohol, also evaporation in the lump, gel-film increases gradually at the sticking power of substrate surface simultaneously, cause film edge and the contraction on the base material parallel direction to be obstructed, make substrate surface produce stress, when film behind the substrate surface adhere firmly, its volumetric shrinkage can only show as the contraction on the thickness direction.To make film forming cracking as one-pass film-forming is blocked up.
Thouless (referring to Huang Jianfeng, " sol-gel philosophy and technique ", 132-135, Chemical Industry Press, in September, 2005 first version) prove that stress K and thickness h that film produces have following relation when dry shrinkage:
h
c＝K
C/σΩ (2)
H in the formula
cBe the Critical Cracking thickness, K
CBe critical stress intensity, Ω is the film function relevant with the modular ratio of base material (Ω of gel-film=1), and σ is the liquid-gas meter surface tension of liquid.When coating thickness less than h
cThe time, the required energy of crack propagation reduces than near the stress crackle and the energy that obtains is big, so crackle can not occur; When thickness surpasses h
cThe time, crackle occurs.Usually the sol gel spin coating of pigmenting cracking thickness is not about 1-10 μ m, film by adding tinting pigment, increased the fracture toughness of film, or, reduced the modulus of film by the doping organic composition, cracking thickness to multipotency reaches more than 20 micron, in this case, still restrict the range of application of gel coating film, it is too thin for example to film, in the curtain wall decoration field, can't satisfy the opacifying power requirement; And film when too thin, be difficult to hide fully the defective on the base material, ornamental poor, to the protective effect of base material a little less than, various corrosive mediums penetrate film easily and reach base material, cause the early stage erosion of base material; On the contrary, if it is enough thick to film, corrosive medium arrives base material needs the longer time, thereby has delayed the corrosive generation, and effect was good when the protection effect was thinner than film.
In addition; when being used for aluminum screen wall decoration; curtain wall coating is because of outdoor exposure for a long time; under the thermo-oxidative ageing and acid rain erosion of ultraviolet light degradation, air; the different efflorescence of meeting occurrence degree, and the thickness of filming is reduced year by year, if it is too thin to film; just be difficult to play long-effective protection and decoration function, therefore thickness is the prerequisite that plays protection or decoration function fully.
Allow solvent volatilize naturally under traditional drying means such as room temperature or the heating condition or make solvent evaporates by decompression, all cause the volume of aerogel progressively to shrink inevitably, so that the fragmentation of ftractureing, this is because the fluid in the pore exists capillary cause in the aerogel on the gas-liquid intersection interface.
Cracking problem when solving that gel coating film is thick to be coated with, being seen in has in the measure of report that (referring to Chen Longwu, Wang Jue, " supercritical drying prepares SiO
2The research of aerogel ", SCI, nineteen ninety-fives 16 volume 6 phases: 840-843; The army of repeatedly kicking into etc., " the sol-gel Freeze Drying Technique prepares nano-stannic oxide and sign thereof ", chemistry world, 2004 the 4th phases: 171-174): (1) Supercritical Drying Technology, (2) Freeze Drying Technique, (3) method such as gradient increased temperature desiccating method, but these methods also rest on the initial stage of laboratory study or industrial applications mostly, major cause is aforesaid method or equipment requirements complexity, drying cycle is oversize, cost is too high, and can't satisfy the demand of commercially producing.
In a word, because the problems referred to above that prior art exists, so there is not cheaply, satisfies the method that prevents ceramic film cracking of requirement on industrial application up to now as yet.Therefore, this area presses for the low and effective method that prevents ceramic film cracking of cost of development.
Summary of the invention
The invention provides a kind of new thick-film type ceramic coating, it is suitable for conventional form of construction work and condition of cure, does not increase cost again, has satisfied the requirement of industrial applications, thereby has solved problems of the prior art.
On the one hand, the invention provides a kind of ceramic coating, it is composed of the following components:
The A component: oxide sol, tinting pigment, lamellar pigment, directed auxiliary agent and water by metal are formed, and wherein, the particle diameter of described lamellar pigment is 1-80 μ m, and sheet is directly than being 5-100; And
B component: form by at least two kinds of organoalkoxysilane mixing with different hydrolysis rates;
Wherein, the weight ratio of described A component and B component is 2-3: 1-2; The solid content of described A component is 20-45 weight %.
One preferred embodiment in, described lamellar pigment is selected from: inorganic lamellar pigment and Metal Flake pigment.
Another preferred embodiment in, described inorganic lamellar pigment is selected from: mica powder, pearly pigment, hexagon hydroxide flake aluminium, tabular alumina, iron mica, hexagonal boron nitride, Graphite Powder 99, sheet moly-sulfide and glass flake; Described Metal Flake pigment is selected from: aluminium powder, nickel powder, stainless steel flakes and tungsten powder.
Another preferred embodiment in, described directed auxiliary agent is selected from: Natvosol, carboxymethyl cellulose acetate butyrate and polyvinyl alcohol, its addition are 0.1-5 weight %, in the gross weight of described A component.
Another preferred embodiment in, the oxide sol of described metal is selected from: silica sol, alumina sol, zirconia sol, nickel oxide colloidal sol, cerium oxide sol and yttrium oxide colloidal sol, its particle diameter are 10-100nm; Described tinting pigment is selected from: mineral dye and pigment dyestuff.
Another preferred embodiment in, described organoalkoxysilane is represented by following general formula:
R
nSi(OR’)
4-n
In the formula, R is for replacing or unsubstituted C
1-7Alkyl or replacement or unsubstituted C
1-7Aryl, described substituting group is selected from: amido, epoxy group(ing) and carboxyl; R ' is C
1-3Alkyl; N=0,1 or 2.
Another preferred embodiment in, when R for replacing or unsubstituted C
1-7During aryl, its content accounts for 30 weight % or lower of the gross weight of described B component.
Another preferred embodiment in, the particle diameter of described lamellar pigment is 5-30 μ m, and/or the sheet of described lamellar pigment is directly than being 10-50.
On the other hand, the invention provides a kind of preparation method who is exclusively used in above-mentioned ceramic coating, this method comprises:
Following A component and B component are pressed 2-3: the weight ratio of 1-2 is mixed, at room temperature stirred slaking 3 hours or the longer time, make organoalkoxysilane generation hydrolysis in the B component, and carry out polycondensation or self carries out polycondensation with the oxide sol of metal in the A component, form the sol-gel ceramic coating:
The A component: oxide sol, tinting pigment, lamellar pigment, directed auxiliary agent and water by metal are formed, and wherein, the particle diameter of described lamellar pigment is 1-80 μ m, and sheet is directly than being 5-100; And
B component: form by at least two kinds of organoalkoxysilane mixing with different hydrolysis rates;
Wherein, the solid content of described A component is 20-45 weight %.
On the one hand, the invention provides a kind of method that prevents ceramic film cracking again, this method comprises:
Above-mentioned ceramic coating is applied on the substrate surface of sandblasting by spraying forms coating, and solidified 20 minutes down, obtain indehiscent pottery that thickness reaches the 40-50 micron and film at 160-180 ℃.
Description of drawings
Fig. 1 is the synoptic diagram of the meniscus perfect condition that the colloidal sol volatilization forms in the gel in the prior art.
Fig. 2 is that gel particle is subjected to capillary pressure extruding accumulative synoptic diagram in the prior art.
Fig. 3 is the synoptic diagram that is subjected to the process of the parallel base material arrangement of systolic pressure effect according to the lamellar pigment of an embodiment of the invention.
Fig. 4 is the synoptic diagram according to the observational technique of the cracking thickness of an embodiment of the invention.
Embodiment
The present inventor finds after having passed through extensive and deep research, in two component ceramic coatings of routine are formed, in a kind of component except that using traditional tinting pigment, also use lamellar pigment, and another kind of component uses two or more to have the mixture of the organoalkoxysilane of different hydrolysis rates, because it is composite structured that lamellar pigment can form stratiform, the nacreous layer in the similar nature shell or the brick wall of plastering of buildings, thereby significantly improved the toughness of filming, has anti-rimose effect, and the mixture with organoalkoxysilane of different hydrolysis rates also has the effect that improves the cracking thickness, thereby conventional form of construction work and condition of cure have been obtained being suitable for, do not increase cost again, satisfy the thick-film type ceramic coating of requirement on industrial application.Based on above-mentioned discovery, the present invention is accomplished.
In a first aspect of the present invention, a kind of ceramic coating is provided, it is composed of the following components:
The A component: oxide sol, tinting pigment, lamellar pigment, directed auxiliary agent and water by metal are formed; And
B component: form by at least two kinds of organoalkoxysilane mixing with different hydrolysis rates;
Wherein, the weight ratio of described A component and B component is 2-3: 1-2; The solid content of described A component is 20-45 weight %.
The A component
In the present invention, the A component is made up of oxide sol, tinting pigment, lamellar pigment, directed auxiliary agent and the water of metal.
Lamellar pigment
The employed lamellar pigment of A component of the present invention can be selected from inorganic sheet shape pigment and Metal Flake pigment.Inorganic lamellar pigment comprises: mica powder, various cladded type mica powder (pearly pigment), hexagon hydroxide flake aluminium, tabular alumina, iron mica, hexagonal boron nitride, Graphite Powder 99, sheet moly-sulfide, glass flake etc., wherein, mica powder, tabular alumina, hydroxide flake aluminium, glass flake, boron nitride are preferred, because these materials are not only cheap, and the very slight color of self, almost there is not tinting strength, when being used to prepare coating, to not influence of toning, therefore be called pigment extender again.Metal Flake pigment comprises: aluminium powder, nickel powder, stainless steel flakes, tungsten powder etc., reason owing to cost and stability, practical application at present mainly be aluminium powder, but the tinting strength of aluminium powder is very strong, it is the same with pearly pigment, is referred to as effect pigment, though have the do usefulness similar with the sheet pigment extender, but main purpose provides a kind of unique decorative effect, therefore is not suitable for being used for solid color enamel.
Therefore, the preferred sheet pigment extender of employed lamellar pigment in the A component of the present invention.
In the present invention, add the layered composite structure that lamellar pigment is intended to simulate nacreous layer in the shell, the sheet pigment extender that therefore preferred hardness is low in brittle pottery is filmed, modulus of elasticity is little is as additive, their toughness reinforcing and anti-cracking better effects if.Promptly, at preferred sheet pigment extender, in tabular alumina (Mohs' hardness 8.8-9), glass flake (Mohs' hardness 5.5-6), white mica powder (Mohs' hardness 2-3.5) and boron nitride (Mohs' hardness 1-2), more preferably mica powder, boron nitride and glass flake.
The scope of the median size of the lamellar pigment that the present invention is selected is 1-80 μ m, and preferred scope is 2-50 μ m, and most preferred scope is 5-30 μ m.Particle diameter too greatly not only influences appearance of film, and can arrange because of it is parallel to base material, the volatilization of resistance retarding solvent, and it is sick that hot setting produces lacquers such as " prickly heat " and pore.And the order number is too high, the lamellar pigment that particle diameter is too little, and the path length and the thickness of sheet are approaching, approximate granular pigment, therefore just having lost increases the flexible effect of filming.
Further find that the factor that influence the lamellar pigment action effect also relates to the length of lamellar pigment and thickness than (be called for short sheet directly than), the sheet of generally selecting for use is 5-100 than scope directly, and preferred range is 10-50.Because sheet is directly than too little, when identical addition, mean that the lamination of formation is few, toughening effect is poor; As sheet footpath than excessive, the insufficient strength of self, broken easily in the attrition process process, main be difficult for when being film forming directed, thereby have influence on effect and appearance of film.
Directed auxiliary agent
In order to improve the directional effect of lamellar pigment, the present invention adopts Natvosol (HEC), carboxymethyl cellulose acetate butyrate (CMCAB), polyvinyl alcohol water soluble resins such as (PVA) directing agent as lamellar pigment, preferred CMCAB, its consumption is 0.1-5 weight %, optimum consumption is 1-2%, in the gross weight of described A component.Volumetric expansion was very big when the characteristics of CMCAB resin were water-soluble, rapid release solvent when dried coating film, volumetric shrinkage, paint film viscosity is increased, produce the systolic pressure of a vertical coating surface simultaneously, the lamellar pigment that constantly moves in the paint film is fixed up fast, and mainly is mode, as shown in Figure 3 with parallel base material.
The oxide sol of metal
In the present invention, oxide sol to metal has no particular limits, it can be the oxide sol of the metal of this area routine, its example comprises, but be not limited to: silica sol, alumina sol, zirconia sol, nickel oxide colloidal sol, cerium oxide sol, yttrium oxide colloidal sol, its particle diameter are 10-100nm.
Tinting pigment
In the present invention, tinting pigment being had no particular limits, can be the tinting pigment of this area routine, and its example includes, but are not limited to: mineral dye has titanium pigment, as titanium white, titan yellow; Iron oxide pigment is as red iron oxide, iron oxide yellow, iron oxide black; The cobalt series pigments is as cobalt blue, cobalt green; Vanadium pigment is as pucherite, vanadium purple; And pigment dyestuff, as phthalocyanine blue, phthalocyanine green and carbon black.
The B component
In the present invention, the B component is made up of at least two kinds of organoalkoxysilane mixing with different hydrolysis rates.Purpose is to utilize the difference of different organoalkoxysilane hydrolysis rates, and the difference of hydrolysate (silanol) polycondensation speed when forming gelation process, film-forming, make cross-linking process progressively finish, avoid string stress to concentrate on very short time formation as far as possible, therefore had the effect that improves the cracking thickness.
Organoalkoxysilane
The employed organoalkoxysilane of B component of the present invention can be represented by following general formula (3):
R
nSi(OR’)
4-n (3)
In the formula, R is for replacing or unsubstituted C
1-7Alkyl or replacement or unsubstituted C
1-7Aryl, described substituting group is selected from: amido, epoxy group(ing) and carboxyl; R ' is C
1-3Alkyl; N=0,1 or 2, wherein,
During n=0, promptly four silicon ester that alkoxyl group replaces mainly contain methyl silicate, tetraethoxy;
During n=1, promptly contain the silane of three alkoxyl groups, the most frequently used have Trimethoxy silane, a triethoxyl silane;
During n=2, promptly contain the silane of two alkoxyl groups, commonly used have dimethoxy dimethylsilane, diethoxymethyl silane, a diethoxy diethylsilane.
The hydrolysis rate of different organoalkoxysilanes is different, usually in fact,
(1) the big more hydrolysis of n is slow more;
(2) the long more hydrolysis of the carbochain of R ' is slow more;
(3) the long more hydrolysis of the carbochain of R is slow more, and alkoxyl group is when identical, and hydrolysis rate slows down successively by the order of amino substituting group＞epoxy group(ing) substituting group＞carboxyl substituent＞branched-chain alkyl＞straight chained alkyl＞aromatic base;
(4) influence the principal element of organoalkoxysilane hydrolysis rate, be followed successively by the carbon chain lengths of n value, R ', the carbon chain lengths of R from big to small.
In the present invention, also without particular limitation to the method for using above-mentioned organoalkoxysilane to cooperate, be two kinds at least but use the kind of silane, consider the convenience that prescription uses simultaneously, generally also should not surpass 5 kinds, the 3-4 kind is the most suitable.
In addition, limited because of the intermiscibility of the collosol-gelatum system after itself and the slaking when R is aromatic hydrocarbons or substituted arene in the present invention, generally be no more than 30% of B component gross weight in use, preferably be controlled in 20%.
In a second aspect of the present invention, a kind of preparation method of ceramic coating is provided, this method comprises:
Above-mentioned A component and B component are pressed 2-3: the weight ratio of 1-2 is mixed, at room temperature stirred slaking 3 hours or the longer time, make organoalkoxysilane generation hydrolysis in the B component, and carry out polycondensation or self carries out polycondensation with the oxide sol of metal in the A component, form the sol-gel ceramic coating.
In a third aspect of the present invention, a kind of method that improves ceramic film cracking thickness is provided, this pottery is filmed, and to be based on sol-gel method prepared, and this method comprises:
Above-mentioned ceramic coating is applied on the surface of the metal base of sandblasting by spraying forms coating, solidified 20 minutes down, form thick-film type (40-50 μ m) pottery and film at 160-180 ℃.
Below referring to accompanying drawing.
Fig. 3 is that the lamellar pigment according to an embodiment of the invention is subjected to the systolic pressure effect to be parallel to the synoptic diagram of the process that base material arranges.As shown in Figure 3, during wet film, the main orientation of lamellar pigment is to favour base material, when dry, with the volatilization of solvent, the volume of film reduces, wet film viscosity increases sharply, and under the acting in conjunction of systolic pressure P and gravity, lamellar pigment will be towards the direction orientation that is parallel to base material, behind the complete drying, this orientation just is fixed.。
Fig. 4 is the synoptic diagram according to the observational technique of the cracking thickness of an embodiment of the invention.As shown in Figure 4, be on the aluminium base of 40cm * 20cm in size, be sprayed with the ceramic coating test sample plate 1 of thickness distribution gradient from top to bottom, promptly upper membrane is thin, and the bottom thickness is the form that increases progressively continuously; Use 20 times of magnifying glasses 2, oil pens tag line 3 that draws.
Major advantage of the present invention is:
The invention provides a kind of thick-film type ceramic coating, this ceramic coating has the splitting resistance that has improved, and is suitable for conventional form of construction work and condition of cure, does not increase cost again, has satisfied the requirement of industrial applications.
Embodiment
Further set forth the present invention below in conjunction with specific embodiment.But, should be understood that these embodiment only are used to the present invention is described and do not constitute limitation of the scope of the invention.The test method of unreceipted actual conditions in the following example, usually according to normal condition, or the condition of advising according to manufacturer.Except as otherwise noted, all per-cent and umber are by weight.
Comparative example 1:
The preparation of A component: the proportioning shown in the according to the form below 1, earlier the CMCAB resin is dissolved in the mixing solutions of Virahol and water in advance, add aluminium colloidal sol, titanium dioxide more successively, it is in the 25 μ m that lapping mode routinely is dispersed to particle diameter, wherein hydroxide flake aluminium is self-control, median size is 2.3 μ m, and sheet is directly than being about 8-15.
B component raw material is chemical pure reagent.
A, B two components were mixed by 2: 1, stir under 800-1200rpm, room temperature cure 3 hours promptly can be used for spraying.
Base material selects for use 2mm thick, is of a size of the aluminium sheet of 40 * 20cm, and with brown corundum sandblast, the plate surface roughness is 3-7 μ m after the sandblast.
Adopt manually spraying, constantly adjust the zero position of spray gun during spraying, make the Gradient distribution that thickness becomes to be increased gradually from top to bottom, it is thin promptly to go up facial mask, below thickness, the thickness scope is greatly about 20-65 μ m, dodge and did 5-10 minute, place under 160 ℃ of temperature, take out after dry 20 minutes.After treating that test plate (panel) cools off fully, permanent pen with black is just drawn a last line (the long limit of vertical test plate (panel)) every a segment distance in the above, and whether with the magnifying glass more than 20 times, it is continuous to observe line along the marking pen line, observe the minimum thickness of crackle, be cracking thickness (referring to Fig. 4).
Embodiment 1-4:
Adopt with comparative example 1 in identical lacquer and the constructional method of joining, different is substitutes titanium dioxide in the prescription with part hydroxide flake aluminium, the weight sum that makes both is 35 weight parts.
Table 1
Embodiment 5-10:
Coating preparation, slaking and constructional method are with comparative example 1, and different is the sericite in powder that lamellar pigment is replaced to different-grain diameter, and the sheet of sericite is thick thinner, and generally at 0.3-0.5 μ m, with the particle diameter difference, sheet is directly than in the 6-150 scope.Concrete proportioning and test-results see the following form 2.
Table 2
Comparative example 2:
According to comparative example 1 described method, preparation A component, and be ground to below the 25 μ m, with A/B=2/1 mixing slaking 3 hours, making sheet, evaluation cracking thickness.The raw material and the proportioning of A, B two components see the following form 3.
Embodiment 11-14:
The preparation method of A component is with comparative example 1, the organoalkoxysilane in the B component press the mixed shown in the table 3 evenly after, again with the A component by A/B=2/1 mixing slaking.
Table 3
All quote in this application as a reference at all documents that the present invention mentions, just quoted as a reference separately as each piece document.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after having read above-mentioned teachings of the present invention, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Claims (10)
1. ceramic coating, it is composed of the following components:
The A component: oxide sol, tinting pigment, lamellar pigment, directed auxiliary agent and water by metal are formed, and wherein, the particle diameter of described lamellar pigment is 1-80 μ m, and sheet is directly than being 5-100; And
B component: form by at least two kinds of organoalkoxysilane mixing with different hydrolysis rates;
Wherein, the weight ratio of described A component and B component is 2-3: 1-2; The solid content of described A component is 20-45 weight %.
2. ceramic coating as claimed in claim 1 is characterized in that, described lamellar pigment is selected from: inorganic lamellar pigment and Metal Flake pigment.
3. ceramic coating as claimed in claim 2, it is characterized in that described inorganic lamellar pigment is selected from: mica powder, pearly pigment, hexagon hydroxide flake aluminium, tabular alumina, iron mica, hexagonal boron nitride, Graphite Powder 99, sheet moly-sulfide and glass flake; Described Metal Flake pigment is selected from: aluminium powder, nickel powder, stainless steel flakes and tungsten powder.
4. ceramic coating as claimed in claim 1 is characterized in that, described directed auxiliary agent is selected from: Natvosol, carboxymethyl cellulose acetate butyrate and polyvinyl alcohol, its addition are 0.1-5 weight %, in the gross weight of described A component.
5. ceramic coating as claimed in claim 1 is characterized in that, the oxide sol of described metal is selected from: silica sol, alumina sol, zirconia sol, nickel oxide colloidal sol, cerium oxide sol and yttrium oxide colloidal sol, its particle diameter are 10-100nm; Described tinting pigment is selected from: mineral dye and pigment dyestuff.
6. ceramic coating as claimed in claim 1 is characterized in that, described organoalkoxysilane is represented by following general formula:
R
nSi(OR’)
4-n
In the formula, R is for replacing or unsubstituted C
1-7Alkyl or replacement or unsubstituted C
1-7Aryl, described substituting group is selected from: amido, epoxy group(ing) and carboxyl; R ' is C
1-3Alkyl; N=0,1 or 2.
7. ceramic coating as claimed in claim 6 is characterized in that, when R is replacement or unsubstituted C
1-7During aryl, its content accounts for 30 weight % or lower of the gross weight of described B component.
8. as each described ceramic coating among the claim 1-7, it is characterized in that the particle diameter of described lamellar pigment is 5-30 μ m, and/or the sheet of described lamellar pigment is directly than being 10-50.
9. the preparation method of a ceramic coating, this method comprises:
Following A component and B component are pressed 2-3: the weight ratio of 1-2 is mixed, at room temperature stirred slaking 3 hours or the longer time, make organoalkoxysilane generation hydrolysis in the B component, and carry out polycondensation or self carries out polycondensation with the oxide sol of metal in the A component, form the sol-gel ceramic coating:
The A component: oxide sol, tinting pigment, lamellar pigment, directed auxiliary agent and water by metal are formed, and wherein, the particle diameter of described lamellar pigment is 1-80 μ m, and sheet is directly than being 5-100; And
B component: form by at least two kinds of organoalkoxysilane mixing with different hydrolysis rates;
Wherein, the solid content of described A component is 20-45 weight %.
10. method that prevents ceramic film cracking, this method comprises:
Each ceramic coating among the claim 1-8 is applied on the substrate surface of sandblasting by spraying forms coating, and solidified 20 minutes down, obtain indehiscent pottery that thickness reaches the 40-50 micron and film at 160-180 ℃.
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