CN105086527A - Low-infrared-emissivity composite pigment and preparation method thereof - Google Patents
Low-infrared-emissivity composite pigment and preparation method thereof Download PDFInfo
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Abstract
The invention provides a low-infrared-emissivity composite pigment and a preparation method thereof. The method comprises the following steps: preparing a bismuth nitrate solution by using Bi(NO)3.5H2O as a solute and ethylene glycol as a solvent, adding a dispersing agent and aluminum powder, carrying out ultrasonic dispersion, and dropwisely adding a weak alkali solution at uniform speed; after the reaction finishes, collecting the precipitate, drying, and grinding to obtain precursor powder; and calcining the precursor powder, and carrying out furnace cooling to obtain the low-infrared-emissivity composite pigment. The pigment is a flake aluminum powder pigment coated with bismuth oxide on the surface. The low-infrared-emissivity composite pigment prepared by the method has yellow appearance and low metallic gloss, and the average infrared emissivity is 0.43 under the optimal formula and technological conditions, thereby satisfying the technical requirements of the colored energy-saving coating and disguise application. The color is yellow, the b* value is up to 33.8, and the brightness is 65.8; and thus, the low-infrared-emissivity composite pigment can be used for optical characteristic regulation on the low-emissivity coating. The low-infrared-emissivity composite pigment is subjected to calcining treatment, and thus, has favorable heat stability. The low-infrared-emissivity composite pigment is nontoxic, has small hazards to the human body in the preparation process, and does not generate environment pollution.
Description
Technical field
The invention belongs to technical field of function materials, relate to energy-conserving and environment-protective coated material technology, especially a kind of by flake aluminum be coated on low infrared emissivity composite pigment that the bismuth oxide layer outside it forms and preparation method thereof.
Background technology
Low infrared emissivity coating possesses low heat-emissive and thermoshield function, all has broad prospect of application in many national economy fields such as thermal control, energy-conservation, stealthy camouflages.Low infrared spoke emittance coating is made up of infrared reflecting paint, tinting pigment and tackiness agent usually, and wherein infrared reflecting paint is main functionality medium, high infrared reflection (low-infrared radiation) function of carrying coating; Metallic pigment apply the most ripe general infrared reflecting paint at present, and wherein flake aluminum becomes again the first-selected pigment of low infrared emissivity coating because of cheap and easy to get.Although aluminium powder pigment has excellent thermal infrared reflection characteristic, its high reverse--bias characteristic can bring again coating high brightness and the reflective problem of height simultaneously, is no matter the application backgrounds such as the fields such as energy-conservation, thermal control, or camouflage, all should avoids as far as possible; The former can cause the deficiency in visual appearance and light pollution to a certain degree, and latter directly causes the deterioration of multiple spectra simulation and stealthy performance.
Researchist finds: using aluminium powder as nuclear particle, utilize chemistry or physical means at this particle surface coated one deck tinting pigment particle, the composite particles of this nucleocapsid structure usually can the characteristic of compound two kinds of particles, even produces core, characteristic that shell particles does not have separately or function.US4328042 discloses a kind of method of coated aluminium powder: utilize CVD means to make composite granule pigment at aluminium powder surface deposition one deck iron oxide particles.This composite pigment has strong metalluster, and by adjusting the thickness of iron oxide coated layer, powder presents different color and lusters.But CVD method apparatus expensive, production cost is high, and product is also used for high-grade car paint.After this, the report about coated aluminium powder emerges in an endless stream.CN200810163113.8 discloses a kind of preparation method of 3 layers of clad aluminum pigment: this composite pigment is by taking aluminium powder as internal layer, and silicon-dioxide is middle layer and metal oxide (ferric oxide or chromium sesquioxide) is shell formation.This composite pigment concentration is high, and has higher metalluster; Similar CN201210506950.2 also discloses a kind of by aluminium, the composite pigment that silicon-dioxide and ferric oxide are formed, and this pigment all can not fade in higher temperature (120 DEG C).Composite pigment in these two reports is all that complex structure, complex manufacturing, cost is high by 3 kinds of Material claddings (aluminium core, silicon dioxide intermediate layer, metal oxide shell).Because the hydroxyl connection of silicon dioxide intermediate layer to aluminium flake and metal oxide surface is very capable, metal oxide coating layer can be made more firm, in addition, the introducing of silicon dioxide intermediate layer can also play the effect strengthening colour effect, but the introducing in middle layer can cause aluminium pigment structure complicated, coating thickness increases, and the infrared emittance of pigment worsens.
In addition, the means of liquid-phase precipitation also can be adopted directly at Flake Aluminum Powder Coated layer of metal oxide compound.This employing liquid-phase precipitation method is directly at the composite pigment that aluminium flake oxide coated on surface particle obtains, structure lacks the silicon dioxide intermediate layer of cohesive action, thus the stability that is combined with aluminium flake of oxide cladding layers is not as having the pigment of silicon dioxide layer, but its structure is simple, coating layer is thinner, and infrared emittance is very low; Preparation technology is also relatively simple on the other hand, advantage of lower cost.Because the chemical property of aluminium powder is very active, very easily oxidized dose is oxidized or is reduced agent reduction, therefore when adopting the direct coated aluminium powder of liquid phase method, aluminium powder is very easily corroded.Therefore, select suitable liquid phase reaction environment very important.Current liquid phase reaction environment can be divided into three kinds: water, alcohol and oil phase.
About the research comparative maturity using water react environment, CN200510027121.6 discloses a kind of at infrared band Surface coating Z 250 flake-like aluminium powder pigment with low-launch-rate and preparation method thereof, this pigment is brown, matt, infrared band (8-14um) average emitted rate is 0.50 ~ 0.65, but the method temperature of reaction is 65 ~ 98 DEG C, and aluminium powder is easily by aqueous corrosion.CN200510027124.X discloses flaky aluminum pigment of a kind of Surface coating hydrated ferric oxide and preparation method thereof, the method temperature of reaction low (25 ~ 50 DEG C), reaction temperature and, pigment is khaki color, emittance is the preparation method that 0.50 ~ 0.60.CN201210443154.9 discloses a kind of nanometer oxygen carrier material metallized aluminum composite particles, under 80 ~ 100 DEG C of temperature of reaction, to oxide compounds such as aluminium powder surface difference coated chromic oxide, ferric oxide, cupric oxide, nickel protoxide, cobalt oxides.The maximum advantage of water react environment is: water can dissolve various metals salt, and cheap and easy to get.But the perishable aluminium powder of the water capacity, when especially reaction system is heated to more than 60 degree, water aggravates the corrosion of aluminium powder.
In order to reduce the corrosion of reaction environment to aluminium powder, researchist adopts alcohol phase reaction environment to replace aqueous environment, CN201210072246.0 discloses a kind of low lightness low-launch-rate aluminium pigment and preparation method thereof, this pigment is yellow-green colour, be made up of aluminium core and chromium sesquioxide shell, the emittance of infrared band (8-14um) is 0.43 ~ 0.70, and brightness is 53.6 ~ 72.1.The method uses anhydrous alcohol solution chromic salts, effectively reduces the corrosion of aluminium powder.But ethanol can not dissolve some metal-salt, such as Bismuth trinitrate etc., alcoholic environment thus can not be used to come the coated bismuth oxide of aluminium flake.In addition chromic oxide is poisonous, and easy contaminate environment, preparation process is large to harm.
Research about aluminium powder coated under oil phase is less, CN201410361019.9 discloses the surface in situ synthesis ferroferric oxide nano granules adopting the method for high temperature oil phase at flaky aluminum particle, obtains the magnetic ferroferric oxide nano granules of tool/flaky aluminum pigment composite nano materials.But the method complex process, need in a nitrogen atmosphere, 310-330 DEG C of stirring reaction, high to the requirement of reaction unit, cost is high.
Visible, mostly the metal oxide tinting pigment particle used at present is ferric oxide, Z 250 and chromic oxide.But the infrared emittance of these materials is all higher, and some metal oxide is wherein poisonous, easy contaminate environment, about use infrared emittance is relatively low and the bismuth oxide of asepsis environment-protecting is less as the report of coating particles.Due under aqueous environment, outside not only aluminium powder can be corroded, and bismuth salt is very easily hydrolyzed, therefore is difficult to use water react environment to realize coated to aluminium flake of bismuth oxide.Under oil phase reaction environment, preparation technology and reaction unit complexity, cost is high.Comparatively speaking, under alcoholic solution environment reaction temperature and, aluminium powder degree of corrosion is low.
Summary of the invention
The shortcoming of prior art in view of the above, the object of this invention is to provide a kind of color environmental protection type low infrared emissivity composite pigment and preparation method thereof, is used for meeting the demand of high-performance color aluminium powder pigment.
For achieving the above object, the invention provides a kind of low infrared emissivity composite pigment, described pigment is the flake-like aluminium powder pigment of Surface coating bismuth oxide, described composite pigment 8 ~ 14um infrared emittance is 0.39 ~ 0.55, coating thickness is 0.2um-0.6um, the brightness L* value of pigment is 65 ~ 77, and the Color Channel b* value from blueness to yellow is+2.8 ~+42.
Described composite structure pigment is a kind of aluminium powder of Surface coating nano bismuth oxide particle, the metalluster utilizing nano particle to hide aluminium powder surface improves aluminium powder erosion resistance simultaneously, and the high infrared reflection ability of reduction aluminium powder within reason, obtain the matrix material at visible ray and infrared band with better multi-Functional Camouflage performance.
The present invention also provides a kind of preparation method of above-mentioned low infrared emissivity composite pigment, comprises the steps:
(1) by Bi (NO)
3.5H
2o is as solute, and ethylene glycol is solvent, is mixed with Bi
3+concentration is the bismuth nitrate solution of 0.05 ~ 0.20mol/L, toward wherein adding dispersion agent, aluminium powder, the dispersion agent added in often liter of solvent is 0.5-0.7g, and the mol ratio of described solute and aluminium powder is 0.1:1 ~ 0.4:1, at the uniform velocity drips the Bi that basic solution makes in reaction solution after ultrasonic disperse
3+whole precipitation;
(2) suction filtration after completion of the reaction, dries filter residue, obtains precursor powder after grinding;
(3) precursor powder obtained is put into retort furnace in 400 ~ 500 DEG C of calcining 2-3h, after furnace cooling, obtain low infrared emissivity composite pigment.
The present invention selects Bismuth trinitrate as the bismuth salt providing bismuth ion, the bismuth salt outside Bismuth trinitrate, can generate Bismuth Oxychloride presoma as bismuth chloride runs into weak caustic solution, cannot obtain the product of expecting, and the Bi in bismuth sulfate solution
3+exist with coordination ion form, effectively cannot provide Bi
3+.
The mol ratio of described solute and aluminium powder is 0.1:1 ~ 0.4:1, aluminium powder and Bi (NO
3)
3ratio too low time, can for coated aluminium flake finite surface area, the Bismuth oxide particles finally obtained is reunited serious, these aggregates or be deposited in aluminium powder surface, or is mixed between powder, and the emittance of powder is sharply raised.Aluminium powder and Bi (NO
3)
3ratio too high time, Bi
3+too low and can not effectively aluminium flake surface formed uniform coating layer, coating layer is sparse, and powder appearance color is shallow, although the emittance of powder is very low, metalluster is strong.
Calcining temperature controls to be advisable between 400 ~ 500 degree, if calcining temperature is lower than 400 degree, presoma thoroughly can not be converted into bismuth oxide; If calcining temperature is higher than 500 degree, aluminium flake can be oxidized and even be out of shape.
The selection of solvent need ensure that Bismuth trinitrate can thoroughly be dissolved in wherein, and forms stable solution, in addition solvent can not with aluminium generation chemical reaction.Conventional solvent, as water and ethanol, and is not suitable as solvent of the present invention.Because of Bi
3+very easily hydrolysis and can not stable existence in water, water perishable aluminium powder in a heated condition; Ethanol can not be used to be then because Bismuth trinitrate is difficult to dissolve in ethanol.The present invention selects a kind of suitable alcohol phase environment, bismuth salt fully can be dissolved, prepare the aluminium pigment of Surface coating bismuth oxide nanoparticle with the temperature of reaction of gentleness.
As optimal way, described dispersion agent is sodium lauryl sulphate or Sodium dodecylbenzene sulfonate.
As optimal way, the aluminium powder added in reaction is the non flake aluminum of centralized particle diameter, and described non flake aluminum particle diameter is 1-50um.
As optimal way, after ultrasonic disperse with the tear drop speed of 0.2 ~ 1.5ml/min at the uniform velocity drip pH value be 8 ~ 9 weak caustic solution make in reaction solution Bi
3+whole precipitation.
Concentration of lye is higher, and drop rate must be corresponding slower.Slower drop rate has the nonhomogen-ous nucleation utilizing presoma, improves the covered effect to aluminium flake.Drop rate is too fast, is unfavorable for nonhomogen-ous nucleation, causes covered effect poor.In addition, the too fast liquid local OH that also can induce reaction of drop rate
-1excessive concentration, because micron-sized flake aluminum has higher activity, meeting and OH
-1reaction.Therefore, drop rate remains on 0.2 ~ 1.5ml/min and is advisable.
As optimal way, described basic solution is ammoniacal liquor or sodium hydroxide solution.
Bi in the too low then above-mentioned reaction solution of alkali consumption
3+can not all precipitate, consumption crosses the corrosion that can aggravate at most aluminium powder.In order to ensure the Bi in above-mentioned reaction solution
3+whole precipitation, excessive be a little advisable (the pH value 8-9) of weak base, can not be too much or very few.
As optimal way, in described step (1), reaction system thermostatic control is at 30-60 degree.
In interpolation basic solution, reaction system answers thermostatic control mix and blend under 30-60 degree.The too low meeting of temperature causes reaction system energy shortage, sluggish; Temperature is too high, causes reaction system energy too high, reaction rate accelerates and be difficult to control, final covered effect is poor, and temperature too high in addition also can aggravate the corrosion of aluminium powder.Stirring velocity should be suitable, ensures that reaction system mixes, and mistake can cause mixing inequality slowly, aluminium flake sinks to bottom, stirs too fast meeting and causes fluid spills.
Beneficial effect of the present invention is: the invention provides a kind of color environmental protection type low infrared emissivity composite structure pigment, is used for meeting the demand for high-performance color aluminium powder pigment.The low infrared emissivity composite structure pigment adopting method of the present invention to prepare, outward appearance is in yellow, and metalluster is low, under optimum formula and processing condition, is 0.43, meets the requirement of infrared stealth in the average emitted rate of infrared band (8 ~ 14um); Color is yellow, and b* value is up to 33.8, and brightness is 65.8, can be used for visible ray camouflage color filler; Through calcination processing, Heat stability is good; Nontoxic, little to harm during preparation, environmentally safe.
Accompanying drawing explanation
Fig. 1 is the electromicroscopic photograph of the pigment that the present invention obtains.
Fig. 2 is original aluminum pigment electromicroscopic photograph.
Fig. 3 is 8 ~ 14um infrared external reflection rational curve of the pigment that obtains of the present invention and original aluminium powder.
Embodiment
Below by way of specific specific examples, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification sheets can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this specification sheets also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Embodiment 1
(1) by Bi (NO)
3.5H
2o is as solute, and ethylene glycol is solvent, is mixed with Bi
3+concentration is the bismuth nitrate solution of 0.20mol/L, and toward wherein adding dispersion agent, aluminium powder, described dispersion agent is sodium lauryl sulphate.The dispersion agent added in often liter of solvent is 0.5g, and the mol ratio of described solute and aluminium powder is 0.1:1, after ultrasonic disperse with the tear drop speed of 1.5ml/min at the uniform velocity drip pH value be 9 weak caustic solution make in reaction solution Bi
3+whole precipitation; Described basic solution is ammoniacal liquor, and reaction system thermostatic control is at 30 degree.
(2) suction filtration after completion of the reaction, dries filter residue, obtains precursor powder after grinding;
(3) precursor powder obtained is put into retort furnace in 400 DEG C of calcining 2h, after furnace cooling, obtain low infrared emissivity composite pigment.
The aluminium powder added in reaction is the non flake aluminum of centralized particle diameter, and described non flake aluminum particle diameter is 1um.
The flake-like aluminium powder pigment that the low infrared emissivity composite pigment utilizing above-mentioned preparation method to obtain is Surface coating bismuth oxide, described composite pigment 8 ~ 14um infrared emittance is 0.39 ~ 0.41, coating thickness is 0.2um-0.6um, the brightness L* value of pigment is 75 ~ 77, and the Color Channel b* value from blueness to yellow is+2.8 ~+5.0.
Embodiment 2
(1) by Bi (NO)
3.5H2O is as solute, and ethylene glycol is solvent, is mixed with Bi
3+concentration is the bismuth nitrate solution of 0.05mol/L, and toward wherein adding dispersion agent, aluminium powder, the dispersion agent added in often liter of solvent is 0.7g, and described dispersion agent is sodium lauryl sulphate.The mol ratio of described solute and aluminium powder is 0.4:1, after ultrasonic disperse with the tear drop speed of 0.2ml/min at the uniform velocity drip pH value be 9 weak caustic solution make in reaction solution Bi
3+whole precipitation; Described basic solution is sodium hydroxide solution.In described step (1), reaction system thermostatic control is at 60 degree.
(2) suction filtration after completion of the reaction, dries filter residue, obtains precursor powder after grinding;
(3) precursor powder obtained is put into retort furnace in 450 DEG C of calcining 3h, after furnace cooling, obtain low infrared emissivity composite pigment.
The aluminium powder added in reaction is the non flake aluminum of centralized particle diameter, and described non flake aluminum particle diameter is 50um.
The flake-like aluminium powder pigment that the low infrared emissivity composite pigment utilizing above-mentioned preparation method to obtain is Surface coating bismuth oxide, described composite pigment 8 ~ 14um infrared emittance is 0.51 ~ 0.55, coating thickness is 0.3um-0.6um, the brightness L* value of pigment is 66 ~ 68, and the Color Channel b* value from blueness to yellow is+39 ~+42.
Embodiment 3
(1) by Bi (NO)
3.5H
2o is as solute, and ethylene glycol is solvent, is mixed with Bi
3+concentration is the bismuth nitrate solution of 0.1mol/L, and toward wherein adding dispersion agent, aluminium powder, the dispersion agent added in often liter of solvent is 0.6g, and described dispersion agent is sodium lauryl sulphate.The mol ratio of described solute and aluminium powder is 0.2:1, after ultrasonic disperse with the tear drop speed of 0.5ml/min at the uniform velocity drip pH value be 8 weak caustic solution make in reaction solution Bi
3+whole precipitation; Described basic solution is ammoniacal liquor.Reaction system thermostatic control is at 40 degree.
(2) suction filtration after completion of the reaction, dries filter residue, obtains precursor powder after grinding;
(3) precursor powder obtained is put into retort furnace in 400 DEG C of calcining 2h, after furnace cooling, obtain low infrared emissivity composite pigment.
The aluminium powder added in reaction is the non flake aluminum of centralized particle diameter, and described non flake aluminum particle diameter is 25um.
The flake-like aluminium powder pigment that the low infrared emissivity composite pigment utilizing above-mentioned preparation method to obtain is Surface coating bismuth oxide, described pigment is the flake-like aluminium powder pigment of Surface coating bismuth oxide, described composite pigment 8 ~ 14um infrared emittance is 0.42 ~ 0.44, coating thickness is 0.2um-0.6um, the brightness L* value of pigment is 65 ~ 68, and the Color Channel b* value from blueness to yellow is+29 ~+34.
Embodiment 4
(1) by Bi (NO)
3.5H
2o is as solute, and ethylene glycol is solvent, is mixed with Bi
3+concentration is the bismuth nitrate solution of 0.1mol/L, and toward wherein adding dispersion agent, aluminium powder, the dispersion agent added in often liter of solvent is 0.5g, and described dispersion agent is Sodium dodecylbenzene sulfonate.The mol ratio of described solute and aluminium powder is 0.2:1, after ultrasonic disperse with the tear drop speed of 1ml/min at the uniform velocity drip pH value be 8 weak caustic solution make in reaction solution Bi
3+whole precipitation; Described basic solution is ammoniacal liquor.Reaction system thermostatic control is at 50 degree.
(2) suction filtration after completion of the reaction, dries filter residue, obtains precursor powder after grinding;
(3) precursor powder obtained is put into retort furnace in 500 DEG C of calcining 2.5h, after furnace cooling, obtain low infrared emissivity composite pigment.
The aluminium powder added in reaction is the non flake aluminum of centralized particle diameter, and described non flake aluminum particle diameter is 40um.
The flake-like aluminium powder pigment that the low infrared emissivity composite pigment utilizing above-mentioned preparation method to obtain is Surface coating bismuth oxide, described pigment is the flake-like aluminium powder pigment of Surface coating bismuth oxide, described composite pigment 8 ~ 14um infrared emittance is 0.42 ~ 0.44, coating thickness is 0.2um-0.6um, the brightness L* value of pigment is 66 ~ 68, and the Color Channel b* value from blueness to yellow is+12 ~+14.
Be below the performance perameter of the sample obtained in 4 embodiments:
The emittance of table 1 sample and colorimetric parameter
As can be seen from the above table, aluminium powder consumption is closely related with the performance of composite pigment.Aluminium powder consumption higher (mol ratio of solute and aluminium powder is 0.1:1) in example 1, the coating layer that presoma is formed on aluminium flake surface is thin, and the composite pigment over-all properties obtained after final calcining is close with pure aluminium powder, and emittance is low and brightness is high.Aluminium powder consumption lower (mol ratio of solute and aluminium powder is 0.4:1) in example 2, except nucleation on aluminium flake, excessive presoma is at the outer nucleating growth of aluminium flake, form Bismuth oxide particles after calcining and be mixed between aluminium flake, thus composite pigment has lower brightness and higher infrared emittance.In example 3, aluminium powder consumption is 2.7g (namely the mol ratio of solute and aluminium powder is 0.2:1), now the proportioning of solute and aluminium powder is best, the coating thickness formed is moderate, covered effect is best, the Bismuth oxide particles be mingled with outside aluminium flake is rare, thus composite pigment brightness is minimum, and infrared emittance is less.Now surface of pigments metalluster is faint, has best visible ray and infrared multi-Functional Camouflage performance.In example 4, solute is identical with example 3 with the mol ratio of aluminium powder, and be all that coating thickness is moderate under optimum proportioning, aluminum sheet metal gloss is covered, and brightness reduces.Because calcining temperature adjusts to 500 degree, be coated on the bismuth oxide crystal formation on aluminium powder surface from β α phase in version in opposite directions, the emittance of α phase bismuth oxide is close with β phase bismuth oxide, but color wants much shallow.Therefore the composite pigment of example 4 has brightness and the emittance of reduction equally, but the composite pigment of b* value ratio 3 is much lower.
As can be seen from Fig. 1 and Fig. 2: composite pigment is in fact be made up of the aluminium flake of internal layer and outer field bismuth oxide, outer oxide bismuth thickness is 0.2um ~ 0.6um, the Thermal Infra-Red of 8um ~ 14um can pass bismuth oxide layer with less loss, and emittance just slightly raises.Composite particles surface is very coarse, is conducive to the loss strengthening visible ray (0.38um ~ 0.77um), reduces composite pigment brightness, thus make composite pigment have the performance of visible ray and infrared multi-Functional Camouflage.
As can be seen from Figure 3: the position of the infrared external reflection curve of this composite granule pigment and the characteristic curve position of pure aluminium powder pigment close, there is excellent properties of infrared reflection.
Comparison example
(1) by Bi (NO)
3.5H
2o is as solute, and ethylene glycol is solvent, is mixed with Bi
3+concentration is the bismuth nitrate solution of 0.25mol/L, and toward wherein adding dispersion agent, aluminium powder, the dispersion agent added in often liter of solvent is 0.3g, and described dispersion agent is sodium lauryl sulphate.The mol ratio of described solute and aluminium powder is 0.2:1, after ultrasonic disperse the tear drop speed of 2ml/min at the uniform velocity drip pH value be 8 weak caustic solution make in reaction solution Bi
3+whole precipitation; Described basic solution is ammoniacal liquor.Reaction system thermostatic control is at 65 degree.
(2) suction filtration after completion of the reaction, dries filter residue, obtains precursor powder after grinding;
(3) precursor powder obtained is put into retort furnace in 400 DEG C of calcining 2h, after furnace cooling, obtain low infrared emissivity composite pigment.
The aluminium powder added in reaction is the non flake aluminum of centralized particle diameter, and described non flake aluminum particle diameter is 25um.
The flake-like aluminium powder pigment that the low infrared emissivity composite pigment utilizing above-mentioned preparation method to obtain is Surface coating bismuth oxide, described pigment is the flake-like aluminium powder pigment of Surface coating bismuth oxide, described composite pigment 8 ~ 14um infrared emittance is 0.47 ~ 0.49, coating thickness is 0 ~ 0.3um, the brightness L* value of pigment is 75 ~ 79, and the Color Channel b* value from blueness to yellow is+33 ~+38.
Example 5 is contrast experiments, although the proportioning of solute and aluminium powder is best, but speed of reaction is too fast, a large amount of bismuth oxide is in the outer homophase nucleation of aluminium flake and grow, be mixed between aluminium flake, covered effect extreme difference, the pigment finally obtained not only emittance is too high, and brightness is very high, being difficult to reach can by the object of light and infrared multi-Functional Camouflage.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (7)
1. a low infrared emissivity composite pigment, it is characterized in that: described pigment is the flake-like aluminium powder pigment of Surface coating bismuth oxide, described composite pigment 8 ~ 14um infrared emittance is 0.39 ~ 0.55, coating thickness is 0.2um-0.6um, the brightness L* value of pigment is 65 ~ 77, and the Color Channel b* value from blueness to yellow is+2.8 ~+42.
2. the preparation method of low infrared emissivity composite pigment according to claim 1, is characterized in that, comprise the steps:
(1) by Bi (NO)
35H
2o is as solute, and ethylene glycol is solvent, is mixed with Bi
3+concentration is the bismuth nitrate solution of 0.05 ~ 0.20mol/L, toward wherein adding dispersion agent, aluminium powder, the dispersion agent added in often liter of solvent is 0.5-0.7g, and the mol ratio of described solute and aluminium powder is 0.1:1 ~ 0.4:1, at the uniform velocity drips the Bi that basic solution makes in reaction solution after ultrasonic disperse
3+whole precipitation;
(2) suction filtration after completion of the reaction, dries filter residue, obtains precursor powder after grinding;
(3) precursor powder obtained is put into retort furnace in 400 ~ 500 DEG C of calcining 2-3h, after furnace cooling, obtain low infrared emissivity composite pigment.
3. the preparation method of low infrared emissivity composite pigment according to claim 2, is characterized in that: described dispersion agent is sodium lauryl sulphate or Sodium dodecylbenzene sulfonate.
4. the preparation method of low infrared emissivity composite pigment according to claim 2, is characterized in that: the aluminium powder added in reaction is the non flake aluminum of centralized particle diameter, and described non flake aluminum particle diameter is 1-50um.
5. the preparation method of low infrared emissivity composite pigment according to claim 2, is characterized in that: after ultrasonic disperse with the tear drop speed of 0.2 ~ 1.5ml/min at the uniform velocity drip pH value be 8 ~ 9 weak caustic solution make in reaction solution Bi
3+whole precipitation.
6. the preparation method of low infrared emissivity composite pigment according to claim 2, is characterized in that: described basic solution is ammoniacal liquor or sodium hydroxide solution.
7. the preparation method of low infrared emissivity composite pigment according to claim 2, is characterized in that: in described step (1), reaction system thermostatic control is at 30-60 degree.
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| CN107521178A (en) * | 2017-06-28 | 2017-12-29 | 浙江盛发纺织印染有限公司 | It is a kind of that there is camouflage fabric that is conductive and inhaling ripple |
| CN108339988A (en) * | 2018-01-26 | 2018-07-31 | 华南理工大学 | A kind of plasmaassisted ball milling prepares method and the application of flake aluminum |
| CN114057469A (en) * | 2020-07-29 | 2022-02-18 | 砺剑防务技术集团有限公司 | Ceramic-based composite stealth coating and preparation method thereof |
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