CN104212206A - Tetraethylorthosilicate inorganic high-temperature-resistant coating and preparation method thereof - Google Patents
Tetraethylorthosilicate inorganic high-temperature-resistant coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a tetraethylorthosilicate inorganic high-temperature-resistant coating. The tetraethylorthosilicate inorganic high-temperature-resistant coating comprises the following components in percentage by mass: 28-35% of tetraethylorthosilicate, 35-50% of heat-resistant pigment and filler, 2%-4% of additives and 13-18% of dimethylformamide, wherein the heat-resistant pigment and filler comprises nano-silicon dioxide, a blocking type functional filler and aluminum powder in the mass ratio of 1.5 to 1 to 1. The invention further designs a preparation method of the tetraethylorthosilicate inorganic high-temperature-resistant coating. According to the tetraethylorthosilicate inorganic high-temperature-resistant coating and the preparation method thereof designed by the invention, the adhesion and the hardness of a cured film formed after heat curing of the coating can be significantly improved along with increase in temperature, the adhesion achieves grade one, the pencil hardness is more than 6H, the high temperature above 800 DEG C can be resisted and the cracking tendency of the coated film is greatly reduced.
Description
Technical field
The invention belongs to special coating technical field, particularly a kind of tetraethoxysilance refractory inorganic paint and preparation method thereof.
Background technology
Steel construction under atmospheric environment acts on by sunlight, dust storm, sleet, frost and dew and temperature and humidity change throughout the year, and the oxygen wherein in air and moisture are the important factors causing outdoor iron structure to corrode, and cause galvanic corrosion; Industrial gasses contain SO2, CO2, NO2, CI2, H2S and NH3 etc., although these composition content are very little, be all very important to the corrosion harmfulness of iron and steel, wherein SO2 has the greatest impact, and CI2 can make metallic surface passivating film be destroyed; These gases are soluble in water in acid, form acid rain, corroding metal facility.
The feature of marine atmosphere is containing a large amount of salt, mainly NaCI, and on the metal surface, the electric action having moisture absorption due to it and increase surperficial liquid film simultaneously CI-itself has again very strong aggressiveness, has thus increased the weight of the corrosion of metallic surface in salt particle sedimentation.Steel construction bank off sea more closely corrodes also more serious, in its etch ratio inland air high times; Traditional anti-corrosion primer can't resolve the environmental change that the moon is different increasingly, so the aseptic production change of exploitation top grade is particularly important; In the industrial production, a lot of machinery equipment is at high temperature run, therefore high temperature corrosion significant; In various high-temperature anticorrosion technology, high-temperature resistant coating has unique superiority, and therefore high-temperature resistant coating is applied widely in high-temperature anticorrosion field.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of tetraethoxysilance refractory inorganic paint and preparation method thereof.
In order to solve above technical problem, the invention provides a kind of tetraethoxysilance refractory inorganic paint, its each constituent mass per-cent is: tetraethoxysilance 28-35%; Heat-resisting color stuffing: 35-50%; Auxiliary agent: 2%-4%, dimethyl formamide: 13-18%, wherein:
Heat-resisting color stuffing comprises:
Nano silicon, isolation-type functional stuffing and aluminium powder and the mass ratio of nano silicon, isolation-type functional stuffing and aluminium powder is 1.5:1:1;
Isolation-type functional stuffing comprises following component according to the mass fraction:
Hollow glass micropearl: 2-6 part, graphite: 10-15 part, black silicon carbide: 20-35 part, fine-grained alumina: 25-30 part, molybdenumdisulphide: 5-10 part, zinc oxide: 1-5 part, talcum powder: 3-6 part;
Auxiliary agent is for comprise following component according to the mass fraction:
Dispersion agent: 10-15 part, wetting agent: 2-6 part, solidifying agent 20-50 part, matting agent: 2-6 part, film coalescence aid: 5-10 part, thickening material: 5-10 part, Natvosol: 5-10 part, pH adjusting agent: 1-5 part, also comprises silane coupling agent in auxiliary agent, the mass ratio of its quality and tetraethoxysilance is 1:15;
Dispersion agent comprises one or more in hydrophobic modified carboxylic acid sodium salt, polyacrylic acid sodium salt or ammonium salt; Matting agent be modified polyester acrylate ester; Film coalescence aid be lauryl alcohol ester and dipropylene according to lauryl alcohol ester: the part by weight compound of dipropylene=1:1 is made; Thickening material comprise: one or several in diatomite, sodium bentonite, urethane, polyvinyl alcohol or polyacrylamide; Solidifying agent be one in diethylenetriamine, mphenylenediamine, DMP-30/ polyamide 6 50, phenol aldehyde modified amine, diamino-diphenyl MSM DDS.
Technique effect: in technique scheme, high-temperature resistant coating is prepared owing to utilizing tetraethoxy, this coating is mineral membrane after thermofixation, along with the rising of temperature, sticking power and the hardness of cured film significantly improve, and sticking power reaches 1 grade, pencil hardness is greater than 6H, make the temperature that coating ability is higher, meanwhile, the use of dimethyl formamide and coupling agent all can reduce film cracking and be inclined to;
Tetraethoxy and silane coupling agent carry out mixed hydrolysis according to mass ratio 15:1, greatly can reduce coating cracking tendency, the use of dimethyl formamide makes greatly accelerate time of drying, add dimethyl formamide in tetraethoxy after, on the one hand, colloidal sol is in gel conversion process, dimethyl formamide is combined with hydrolyzing intermediate by hydrogen bond, inhibit the chemically reactive of hydrolyzing intermediate Si (OC2H5) 4-x (OH) x and product S ixOy (OH) z, reduce sol-hydrolysis, the speed of reaction of polycondensation, to facilitate between particle this is cross-linked with each other, form orderly network structure, improve gel structure, make again gel particle increase simultaneously, mesoporous pore size and pore volume increase, dry rear gel shrinks amount is caused to diminish, obtain the uniform gel of size distribution, thus during solvent evaporation, gel uniform internal stress,
Molybdenumdisulphide, graphite, talcum powder is adopted in isolation-type functional stuffing, graphite material makes it easily produce slippage due to distinctive crystalline structure, graphite metal to-metal contact lubricant has adsorptivity simultaneously, one deck lubricant film (graphite crystal film) can be formed, play the effect reducing frictional wear, there is good thermal diffusivity and thermal conductivity, because the fusing point of carbon is very high, therefore can not produce carbon and metallic substance sting weldering phenomenon; Talcum powder, as filler, can play skeleton function, reduces the hardness of paint film that manufacturing cost improves coating simultaneously, increase the stable of shape of product, increase tensile strength, shearing resistance, flexing intensity, pressure intensity, reduce distortion, extension rate, thermal expansivity, whiteness is high, the dispersed feature such as by force of epigranular, makes that the ductility of coating and workability etc. are excellent to be optimized;
Graphite and molybdenumdisulphide are mixed use, graphite and molybdenumdisulphide have good synergistic effect, both are the wear resisting property that effectively can improve coating used in combination in certain proportion, reduce wear weight loss and frictional coefficient, in coating, add a certain amount of antimonous oxide simultaneously, effectively can strengthen the hardness of paint coatings, and improve the wear resistance of coating.
The technical scheme that the present invention limits further is:
Further, aforesaid tetraethoxysilance refractory inorganic paint, its each constituent mass number per-cent is: tetraethoxysilance 32%; Heat-resisting color stuffing: 49%; Auxiliary agent: 3%, dimethyl formamide: 16%;
Technique effect:
Because dimethyl formamide has low volatility, along with the rising of thermal treatment temp, dimethyl formamide is overflowed gradually along with the volatilization of solvent film surface, the phenomenon of the uneven evaporation of alcoholic solvent in different pore size can be greatly reduced, decrease drying stress, thus keep the integrity of gel framework, suppress the be full of cracks of SiO2 film, when the mass ratio of dimethyl formamide and tetraethoxysilance is 1:2, it is optimum proportioning;
When containing the color stuffing of 45-50% in coating, the temperature that coating ability is 650 DEG C, because adding of nanometer grade silica is played except the effect of reinforcement except to coating, in whipping process and under high temperature, its surface is with a small amount of hydroxyl, hydroxyl on product after being hydrolyzed with tetraethoxysilance reacts, and substantially increases the resistance toheat of coating.
The present invention have also been devised a kind of preparation method of tetraethoxysilance refractory inorganic paint, comprises the steps:
(1) teos hydrolysis is prepared base-material:
(2) by dispersed with stirring after the heat-resisting color stuffing mixing of the tetraethoxysilance of 28-35% mass fraction hydrolysis base-material, 35-50% mass fraction, stirring velocity is 300 turns/min, stirs 25-35 minute, obtained pre-composition;
(3) under whipped state, in pre-composition, slowly dispersion agent, wetting agent, solidifying agent, matting agent, film coalescence aid, thickening material, Natvosol and pH adjusting agent is added successively, adjusting rotary speed is 600 turns/min, churning time is 30 minutes, controls dispersion temperature≤45 DEG C;
(4) improve rotating speed to 1100 turn/min, evenly slowly add the dimethyl formamide that mass fraction is 13-18%, adjust Nian Du≤90s simultaneously, and Gu Han Liang≤70%, obtained tetraethoxysilance refractory inorganic paint.
The preparation method of aforesaid tetraethoxysilance refractory inorganic paint, the concrete operations of teos hydrolysis are: the temperature of water-bath is adjusted to 45 DEG C, the tetraethoxy of 28-35% mass fraction and silane coupling agent are uniformly mixed, the mass ratio of silane coupling agent and tetraethoxysilance is 1:15, slowly drip the mixed solution of water, ethanol and hydrochloric acid again, heating in water bath stirs 2 hours.
The preparation method of aforesaid tetraethoxysilance refractory inorganic paint, in the mixed solution added, the quality of water is 1/2nd of tetraethoxysilance quality, and the quality of ethanol is 1/4th of tetraethoxysilance quality, and the quality of hydrochloric acid and the mass ratio of tetraethoxysilance are 0.6:1.
The preparation method of aforesaid tetraethoxysilance refractory inorganic paint, controls dispersed with stirring to fineness 30 μm in step (3) after adding dispersion agent, wetting agent, solidifying agent, matting agent, film coalescence aid, thickening material, Natvosol and pH adjusting agent.
Embodiment
Embodiment 1
A kind of tetraethoxysilance refractory inorganic paint that the present embodiment provides, its each constituent mass per-cent is: tetraethoxysilance 28%; Heat-resisting color stuffing: 35%; Auxiliary agent: 3%, dimethyl formamide: 15%, wherein:
Heat-resisting color stuffing comprises:
Nano silicon, isolation-type functional stuffing and aluminium powder and the mass ratio of nano silicon, isolation-type functional stuffing and aluminium powder is 1.5:1:1;
Isolation-type functional stuffing comprises following component according to the mass fraction:
Hollow glass micropearl: 3 parts, graphite: 12 parts, black silicon carbide: 2444 parts, fine-grained alumina: 26 parts, molybdenumdisulphide: 6 parts, zinc oxide: 3 parts, talcum powder: 4 parts;
Auxiliary agent is for comprise following component according to the mass fraction:
Dispersion agent: 12 parts, wetting agent: 3 parts, 26 parts, solidifying agent, matting agent: 3 parts, film coalescence aid: 6 parts, thickening material: 8 parts, Natvosol: 8 parts, pH adjusting agent: 2 parts, also comprise silane coupling agent in auxiliary agent, the mass ratio of its quality and tetraethoxysilance is 1:15;
Dispersion agent is hydrophobic modified carboxylic acid sodium salt; Matting agent be modified polyester acrylate ester; Film coalescence aid be lauryl alcohol ester and dipropylene according to lauryl alcohol ester: the part by weight compound of dipropylene=1:1 is made; Thickening material comprise: diatomite, sodium bentonite and urethane; Solidifying agent be diamino-diphenyl MSM DDS, its Performance Detection parameter is as shown in table 1:
Table 1
Embodiment 2
A kind of tetraethoxysilance refractory inorganic paint that the present embodiment provides, its each constituent mass number per-cent is: tetraethoxysilance 32%; Heat-resisting color stuffing: 49%; Auxiliary agent: 3%, dimethyl formamide: 16%, heat-resisting color stuffing is nano silicon and aluminium powder, and the mass ratio of nano silicon and aluminium powder is 1.5:1, wherein,
Heat-resisting color stuffing comprises:
Nano silicon, isolation-type functional stuffing and aluminium powder and the mass ratio of nano silicon, isolation-type functional stuffing and aluminium powder is 1.5:1:1;
Isolation-type functional stuffing comprises following component according to the mass fraction:
Hollow glass micropearl: 4 parts, graphite: 11 parts, black silicon carbide: 26 parts, fine-grained alumina: 26 parts, molybdenumdisulphide: 6 parts, zinc oxide: 4 parts, talcum powder: 4 parts;
Auxiliary agent is for comprise following component according to the mass fraction:
Dispersion agent: 11 parts, wetting agent: 4 parts, 2555 parts, solidifying agent, matting agent: 5 parts, film coalescence aid: 8 parts, thickening material: 8 parts, Natvosol: 6 parts, pH adjusting agent: 4 parts, also comprise silane coupling agent in auxiliary agent, the mass ratio of its quality and tetraethoxysilance is 1:15;
Dispersion agent is one or more in polyacrylic acid sodium salt or ammonium salt; Matting agent be modified polyester acrylate ester; Film coalescence aid be lauryl alcohol ester and dipropylene according to lauryl alcohol ester: the part by weight compound of dipropylene=1:1 is made; Thickening material comprise: diatomite, sodium bentonite and polyacrylamide; Solidifying agent be DMP-30/ polyamide 6 50;
Its performance perameter is as shown in table 2:
Table 2
Embodiment 3
The preparation method of a kind of tetraethoxysilance refractory inorganic paint that the present embodiment provides, comprises the steps:
(1) teos hydrolysis is prepared base-material, concrete operations are: the temperature of water-bath is adjusted to 45 DEG C, the tetraethoxy of 32% mass fraction and silane coupling agent are uniformly mixed, the mass ratio of silane coupling agent and tetraethoxysilance is 1:15, slowly drip the mixed solution of water, ethanol and hydrochloric acid again, heating in water bath stirs 2 hours, wherein, the quality of water is 1/2nd of tetraethoxysilance quality, the quality of ethanol is 1/4th of tetraethoxysilance quality, and the quality of hydrochloric acid and the mass ratio of tetraethoxysilance are 0.6:1;
(2) by dispersed with stirring after the heat-resisting color stuffing mixing of the tetraethoxysilance of 32% mass fraction hydrolysis base-material, 45% mass fraction, stirring velocity is 300 turns/min, stirs 25-35 minute, obtained pre-composition;
(3) under whipped state, in pre-composition, slowly dispersion agent, wetting agent, solidifying agent, matting agent, film coalescence aid, thickening material, Natvosol and pH adjusting agent is added successively, adjusting rotary speed is 600 turns/min, churning time is 30 minutes, control dispersion temperature≤45 DEG C, control dispersed with stirring to fineness 30 μm;
(4) improve rotating speed to 1100 turn/min, evenly slowly add the dimethyl formamide that mass fraction is 16%, adjust Nian Du≤90s simultaneously, and Gu Han Liang≤70%, obtained tetraethoxysilance refractory inorganic paint, its performance is as shown in table 3:
Table 3
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (6)
1. a tetraethoxysilance refractory inorganic paint, is characterized in that, its each constituent mass per-cent is: tetraethoxysilance 28-35%; Heat-resisting color stuffing: 35-50%; Auxiliary agent: 2%-4%, dimethyl formamide: 13-18%, wherein
Described heat-resisting color stuffing comprises:
Nano silicon, isolation-type functional stuffing and aluminium powder and the mass ratio of described nano silicon, isolation-type functional stuffing and aluminium powder is 1.5:1:1;
Described isolation-type functional stuffing comprises following component according to the mass fraction:
Hollow glass micropearl: 2-6 part, graphite: 10-15 part, black silicon carbide: 20-35 part, fine-grained alumina: 25-30 part, molybdenumdisulphide: 5-10 part, zinc oxide: 1-5 part, talcum powder: 3-6 part;
Described auxiliary agent is for comprise following component according to the mass fraction:
Dispersion agent: 10-15 part, wetting agent: 2-6 part, solidifying agent 20-50 part, matting agent: 2-6 part, film coalescence aid: 5-10 part, thickening material: 5-10 part, Natvosol: 5-10 part, pH adjusting agent: 1-5 part, also comprises silane coupling agent in auxiliary agent, the mass ratio of its quality and tetraethoxysilance is 1:15;
Described dispersion agent comprises one or more in hydrophobic modified carboxylic acid sodium salt, polyacrylic acid sodium salt or ammonium salt; Described matting agent is modified polyester acrylate ester; Described film coalescence aid be lauryl alcohol ester and dipropylene according to lauryl alcohol ester: the part by weight compound of dipropylene=1:1 is made; Described thickening material comprises: one or several in diatomite, sodium bentonite, urethane, polyvinyl alcohol or polyacrylamide; Described solidifying agent is the one in diethylenetriamine, mphenylenediamine, DMP-30/ polyamide 6 50, phenol aldehyde modified amine, diamino-diphenyl MSM DDS.
2. tetraethoxysilance refractory inorganic paint according to claim 1, is characterized in that, its each constituent mass number per-cent is: tetraethoxysilance 32%; Heat-resisting color stuffing: 49%; Auxiliary agent: 3%, dimethyl formamide: 16%.
3. the preparation method of tetraethoxysilance refractory inorganic paint according to claim 1, is characterized in that, comprise the steps:
(1) teos hydrolysis is prepared base-material:
(2) by dispersed with stirring after the heat-resisting color stuffing mixing of the tetraethoxysilance of 28-35% mass fraction hydrolysis base-material, 35-50% mass fraction, stirring velocity is 300 turns/min, stirs 25-35 minute, obtained pre-composition;
(3) under whipped state, in pre-composition, slowly dispersion agent, wetting agent, solidifying agent, matting agent, film coalescence aid, thickening material, Natvosol and pH adjusting agent is added successively, adjusting rotary speed is 600 turns/min, churning time is 30 minutes, controls dispersion temperature≤45 DEG C;
(4) improve rotating speed to 1100 turn/min, evenly slowly add the dimethyl formamide that mass fraction is 13-18%, adjust Nian Du≤90s simultaneously, and Gu Han Liang≤70%, obtained tetraethoxysilance refractory inorganic paint.
4. the preparation method of tetraethoxysilance refractory inorganic paint according to claim 3, it is characterized in that, the concrete operations of teos hydrolysis are: the temperature of water-bath is adjusted to 45 DEG C, the tetraethoxy of 28-35% mass fraction and silane coupling agent are uniformly mixed, the mass ratio of silane coupling agent and tetraethoxysilance is 1:15, slowly drip the mixed solution of water, ethanol and hydrochloric acid again, heating in water bath stirs 2 hours.
5. the preparation method of the tetraethoxysilance refractory inorganic paint as requested described in 4, it is characterized in that, in the mixed solution added, the quality of water is 1/2nd of tetraethoxysilance quality, the quality of ethanol is 1/4th of tetraethoxysilance quality, and the quality of hydrochloric acid and the mass ratio of tetraethoxysilance are 0.6:1.
6. according to the preparation method of the tetraethoxysilance refractory inorganic paint in claim 3 to 5 described in any one claim, it is characterized in that, control dispersed with stirring after adding dispersion agent, wetting agent, solidifying agent, matting agent, film coalescence aid, thickening material, Natvosol and pH adjusting agent in step (3) to fineness 30 μm.
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| CN104610561A (en) * | 2015-02-10 | 2015-05-13 | 苏州科胜仓储物流设备有限公司 | Corrosion-resistant PVC section bar for storage facility and treatment process thereof |
| CN104610560A (en) * | 2015-02-10 | 2015-05-13 | 苏州科胜仓储物流设备有限公司 | PVC (polyvinyl chloride) profile for anti-cracking impact-resistant back net reinforcing ribs and treatment technique thereof |
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Application publication date: 20141217 |