CN105315821A - Anti-shedding carbon nano paint and preparation method thereof - Google Patents
Anti-shedding carbon nano paint and preparation method thereof Download PDFInfo
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- CN105315821A CN105315821A CN201410337179.XA CN201410337179A CN105315821A CN 105315821 A CN105315821 A CN 105315821A CN 201410337179 A CN201410337179 A CN 201410337179A CN 105315821 A CN105315821 A CN 105315821A
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- diatomite
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Abstract
The invention provides an anti-shedding carbon nano paint and a preparation method thereof. The paint is composed of the following components in percentage by weight: 5 to 20 wt% of nano Al2O3, 50 to 80 wt% of diatomite, 2 to 10 wt% of graphite powder, 5 to 20 wt% of binder, 1 to 3 wt% of suspended dispersing agent, and the balance being solvent and impurities. The preparation method comprises the following steps: preparing an Al(NO3)3 water solution and a NH4HCO3 water solution from Al(NO3)3 and NH4HCO3 respectively; adding the Al(NO3)3 water solution into turbid liquid of diatomite and NH4HCO3, filtering and washing generated Al(OH)3 precipitate to obtain a mixture of nano Al(OH)3 and diatomite; heating to dehydrate the mixture to form nano Al2O3; adding a solvent, graphite powder, binder and a suspended dispersing agent into the mixture of nano Al2O3 and diatomite, and evenly mixing to obtain the nano level anti-shedding carbon slurry. The provided paint has the advantages that the size of nano particles is uniform, the size is small, the dispersibility is good, the cost is low, the preparation and painting technologies are simple and feasible, the natural peeling ability is strong, the high temperature oxidation and decarbonization of steel plate can be effectively avoided, and the paint is suitable for precision machining of metal workpiece with complicated shapes.
Description
Technical field
The invention belongs to metal finishing Material Field, particularly relate to and a kind ofly prevent nano paint of metal works high temperature oxidation decarburization in oxidizing atmosphere and preparation method thereof.
Background technology
Metal Materials At High Temperature heating is a kind of common working method.Such as material heat treatment produces solid-state phase changes by heating metal, being incubated and cool, and reaches and change its internal organizational structure, eliminate material defect, the object of crystal grain thinning.The final work-ing life realizing prolongation metallic element, the object of environmental protection and energy saving.During heat, if the carbon of metallic surface contact with oxidizing atmosphere can cause be oxidized, the generation of decarburization phenomenon.And along with the increase of metal surface and inner carbon concentration difference aggravates decarburization phenomenon further.Thus cause the intensity of workpiece, the decline of the mechanical property such as hardness and wear resistance.The appearance of quenching crack even can be caused during thermal treatment.The common method of current head it off has two kinds: one to be adopt vacuum furnace to carry out heat treated to sample; Two is spray anti-decarburizing coating at specimen surface.Vacuum oven equipment is complicated, and cost is high, and narrower by workpiece shapes shape restriction range of application.And antioxidizing paint has easy to use, that cost is low, effective feature, be widely used.
High-quality coating should have that Heat stability is good, coating are fine and close, thixotropy and the feature such as rheological is good.Because nano material has unique surface effects and small-size effect, cause its fusing point to reduce, meltbility is good.And the tiling of nano particle comparatively plain particles is good, and porosity is low, bonding strength is large, and hardness is high.Therefore add a little nanoparticle component, coating reaction activity can be increased, thus technically without the need to the too large cost of cost, the function of traditional coating is got a qualitative improvement.
The patent of invention of publication number CN102352142A discloses a kind of high-temperature nano masking paste, with the addition of Nano-Scaled Carbide and nitride in this formulation for coating material, have high temperature-proof carburizing, high heat conductance, with matrix part have good bonding strength, with molten iron infiltrate the feature eliminating air gap performance.But do not relate to the preparation method of nanometer additive in this patent.If directly purchase, can increase coating cost, limit applying of this product.
Publication number CN1632137A patent of invention discloses a kind of preparation method from peeling off high-temp antioxidizing/decarburization coated material.This coating composition, for reaching interpolation Nano grade, needs vitreum matrix by the TiO allocated by proportioning
2, SiO
2, Al
2o
3with glass powder tumbling ball mill ball milling 24 hours.This method increase process energy consumption, and after ball milling, size distribution accurately cannot control, unstable product quality.
Summary of the invention
The object of this invention is to provide one and have that effect of preventing decarburization is good, cost is low, nano level high-temp antioxidizing/decarburizing coating simple to operate and preparation method thereof.Utilize sol-gel method fabricated in situ nanometer Al
2o
3particle, and by its uniform loading in diatomite surface, ensure that the nano-scale dimension composition of coating.
For this reason, the solution that the present invention takes is:
A kind of anti-decarburization nano paint, its moiety and wt% are: nanometer Al
2o
35 ~ 20%, diatomite 50 ~ 80%, Graphite Powder 99 2 ~ 10%, binding agent 5 ~ 20%, suspension dispersive agent 1 ~ 3%, surplus is solvent and impurity.
Described binding agent is one or both in water-soluble cpds polyacrylate or polyoxyethylene glycol.Described polyacrylate to be molecular weight be 15000 ~ 30000 sodium polyacrylate and polyacrylic acid potassium; Described molecular weight polyethylene glycol is 2000 ~ 8000.
Described suspension dispersive agent is sodium bentonite and carboxymethyl cellulose;
Described solvent is water and alcohol.
Described nanometer Al
2o
3granularity is 20 ~ 100nm.
A preparation method for anti-decarburization nano paint, its concrete preparation process is:
1, take by quality proportioning: Al (NO
3)
321 ~ 84 parts, NH
4hCO
324 ~ 93 parts, 50 ~ 80 parts, diatomite, Graphite Powder 99 2 ~ 10 parts, binding agent 5 ~ 20 parts, suspension dispersive agent 1 ~ 3 part, for subsequent use;
2, by Al (NO
3)
3and NH
4hCO
3be dissolved in respectively in deionized water, be mixed with Al (NO
3)
3saturated solution and NH
4hCO
3saturated solution;
3, diatomite is added NH
4hCO
3stir into suspension liquid in solution, while stirring, add Al (NO wherein lentamente
3)
3solution reacts, and generates by the Al of diatomite high dispersing (OH)
3throw out;
4, the throw out filtration washing will generated, obtains by nanometer Al (OH)
3with the mixture of diatomite composition;
5, this mixture is heated 30min at 200 ~ 300 DEG C, make nanometer Al (OH)
3dehydration forms nanometer Al
2o
3;
6, the nanometer Al will obtained after reaction
2o
3add solvent, Graphite Powder 99, binding agent and suspension dispersive agent with in diatomite mixture, after stirring, form nanometer anticreep carbon pastes.
The using method of coating of the present invention and beneficial effect are:
During use, first clean out the floating sand of surface of steel workpiece, dust, impurity such as oil rust etc., then use the instrument such as spray gun, roller brush, with artificial or mechanical painting way by paint at pending workpiece surface, coat-thickness is 0.1 ~ 1.0mm.After heating cooling, due to the difference of the thermal expansivity of steel workpiece and coated material, coating is caused naturally to be peeled off.
SiO in diatomite
2be the main formation of glass, the physical strength of coating can be improved, Al
2o
3the effect of reinforced glass network structure can be played, improve the vitrifying ability of coating.The small-size effect that nano material has can improve Al
2o
3reactive behavior, reduces fusing point, thus promotes coating sintering when thermal treatment is heated, and makes coating wrap up steel billet densely, plays a good protection.
The present invention prepares the anti-decarburizing coating of nano-scale particle by sol-gel method original position, formed the colloid of nano particle by chemical reaction, allow it be disperseed by other carrier height in reaction process simultaneously, form uniform granularity, dimensional structure is little, the nano paint of good dispersity.The nano paint adopting sol-gel method to prepare can effectively prevent steel plate high temperature oxidation and decarburization, is environment protecting water-based paint, Nano grade, is applicable to various complicated shape, precision machined metal works.This coated material is easy to use, with low cost, preparation and coating processes simple, by force, suitability is wide for self-flaking performance.
Accompanying drawing explanation
Fig. 1 is without microstructure after the process of coating protection steel plate hot;
Fig. 2 is microstructure after the process of nano paint protection steel plate hot.
Embodiment
The present invention is further described by the following embodiment.
Embodiment 1
Anti-decarburization nano paint each chemical composition quality is as shown in table 1:
Table 1 embodiment 1 prepares raw material and the proportioning of coating
Al (NO is taken according to table 1
3)
3and NH
4hCO
3be dissolved in deionized water respectively and form solution.Terra silicea purificata is added NH
4hCO
3stir into suspension liquid in solution, while stirring, add Al (NO wherein lentamente
3)
3solution, carries out precipitin reaction.The throw out of generation filtered and at 200 ~ 300 DEG C, heats 30min after abundant washing, obtaining nanometer Al
2o
3with the mixture of diatomite composition.First with alcohol, sodium polyacrylate is carried out predissolve, add water subsequently and form liquid-containing binder.In this mixture, add solvent, Graphite Powder 99, binding agent and suspension dispersive agent, nanometer anticreep carbon pastes after stirring, can be formed.
Under room temperature by obtained coating even application at 42CrMo specimen surface to be heated.Workpiece is carried out oil quenching thermal treatment, protected surperficial metal luster after insulation 60min 860 DEG C time, and metallographic examination is analyzed and is found, protected non-oxidation, decarburization phenomenon occur.After quenching, coating is peeled off naturally.
Embodiment 2
Anti-decarburization nano paint each chemical composition quality is as shown in table 2:
Table 2 embodiment 2 coating composition proportioning
Al (NO is taken according to table 2
3)
3and NH
4hCO
3be dissolved in deionized water respectively and form saturated solution.Diatomite is added NH
4hCO
3stir into suspension liquid in solution, while stirring, add Al (NO wherein lentamente
3)
3solution, carries out precipitin reaction.The throw out of generation filtered and at 200 ~ 300 DEG C, heats 30min after abundant washing, obtaining nanometer Al
2o
3with the mixture of diatomite composition.First with alcohol, sodium polyacrylate is carried out predissolve, add water subsequently and form liquid-containing binder.In this mixture, add solvent, Graphite Powder 99, binding agent and suspension dispersive agent, nanometer anticreep carbon pastes after stirring, can be formed.
Under room temperature by obtained coating even application at 30CrMoA specimen surface to be heated.Workpiece is carried out oil quenching thermal treatment, protected surperficial metal luster after insulation 60min 860 DEG C time, and metallographic examination is analyzed and is found, protected non-oxidation, decarburization phenomenon occur.After quenching, coating is peeled off naturally.
Claims (3)
1. an anti-decarburization nano paint, is characterized in that, its moiety and wt% are: nanometer Al
2o
35 ~ 20%, diatomite 50 ~ 80%, Graphite Powder 99 2 ~ 10%, binding agent 5 ~ 20%, suspension dispersive agent 1 ~ 3%, surplus is solvent and impurity;
Described binding agent is one or both in polyacrylate or polyoxyethylene glycol; Described polyacrylate to be molecular weight be 15000 ~ 30000 sodium polyacrylate and polyacrylic acid potassium; Described molecular weight polyethylene glycol is 2000 ~ 8000;
Described suspension dispersive agent is sodium bentonite and carboxymethyl cellulose;
Described solvent is water and alcohol.
2. anti-decarburization nano paint according to claim 1, is characterized in that, described nanometer Al
2o
3granularity is 20 ~ 100nm.
3. a preparation method for anti-decarburization nano paint as claimed in claim 1, it is characterized in that, concrete preparation process is:
(1) take by quality proportioning: Al (NO
3)
321 ~ 84 parts, NH
4hCO
324 ~ 93 parts, 50 ~ 80 parts, diatomite, Graphite Powder 99 2 ~ 10 parts, binding agent 5 ~ 20 parts, suspension dispersive agent 1 ~ 3 part, for subsequent use;
(2) by Al (NO
3)
3and NH
4hCO
3be dissolved in respectively in deionized water, be mixed with Al (NO
3)
3saturated solution and NH
4hCO
3saturated solution;
(3) diatomite is added NH
4hCO
3stir into suspension liquid in solution, while stirring, add Al (NO wherein lentamente
3)
3solution reacts, and generates by the Al of diatomite high dispersing (OH)
3throw out;
(4) the throw out filtration washing will generated, obtains by nanometer Al (OH)
3with the mixture of diatomite composition;
(5) this mixture is heated 30min at 200 ~ 300 DEG C, make nanometer Al (OH)
3dehydration forms nanometer Al
2o
3;
(6) the nanometer Al will obtained after reaction
2o
3add solvent, Graphite Powder 99, binding agent and suspension dispersive agent with in diatomite mixture, after stirring, form nanometer anticreep carbon pastes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410337179.XA CN105315821A (en) | 2014-07-16 | 2014-07-16 | Anti-shedding carbon nano paint and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410337179.XA CN105315821A (en) | 2014-07-16 | 2014-07-16 | Anti-shedding carbon nano paint and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105315821A true CN105315821A (en) | 2016-02-10 |
Family
ID=55244166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410337179.XA Pending CN105315821A (en) | 2014-07-16 | 2014-07-16 | Anti-shedding carbon nano paint and preparation method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN105315821A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107500790A (en) * | 2017-08-11 | 2017-12-22 | 河南华西耐火材料有限公司 | A kind of anti-decarburizing coating of high temperature and preparation method thereof |
| CN108044673A (en) * | 2018-01-10 | 2018-05-18 | 上海应用技术大学 | A kind of multifunctional intellectual carbon nano coating masticator |
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| CN1510089A (en) * | 2002-12-20 | 2004-07-07 | 鞍山钢铁集团公司 | Coating for preventing high-carbon billet from decarbonization |
| CN1632137A (en) * | 2003-12-22 | 2005-06-29 | 中南大学 | High-efficiency self-stripping high-temperature oxidation/decarburization-resistant coating material |
| CN101265372A (en) * | 2008-04-26 | 2008-09-17 | 山西玺汇科技有限公司 | Stainless steel high temperature oxidation resistance paint and application thereof |
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2014
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| CN1510089A (en) * | 2002-12-20 | 2004-07-07 | 鞍山钢铁集团公司 | Coating for preventing high-carbon billet from decarbonization |
| CN1632137A (en) * | 2003-12-22 | 2005-06-29 | 中南大学 | High-efficiency self-stripping high-temperature oxidation/decarburization-resistant coating material |
| CN101265372A (en) * | 2008-04-26 | 2008-09-17 | 山西玺汇科技有限公司 | Stainless steel high temperature oxidation resistance paint and application thereof |
| US20110305605A1 (en) * | 2009-02-26 | 2011-12-15 | Basf Se | Protective coating for metallic surfaces and production thereof |
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Cited By (4)
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|---|---|---|---|---|
| CN107500790A (en) * | 2017-08-11 | 2017-12-22 | 河南华西耐火材料有限公司 | A kind of anti-decarburizing coating of high temperature and preparation method thereof |
| CN107500790B (en) * | 2017-08-11 | 2019-12-31 | 河南华西耐火材料有限公司 | High-temperature decarburization-resistant coating and preparation method thereof |
| CN108044673A (en) * | 2018-01-10 | 2018-05-18 | 上海应用技术大学 | A kind of multifunctional intellectual carbon nano coating masticator |
| CN108044673B (en) * | 2018-01-10 | 2023-11-21 | 上海应用技术大学 | Multifunctional intelligent carbon nano-coating meat mincing machine |
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Application publication date: 20160210 |