CN105038445A - Aqueous slurry material containing silicon dioxide aerosol, preparation method and application thereof - Google Patents
Aqueous slurry material containing silicon dioxide aerosol, preparation method and application thereof Download PDFInfo
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- CN105038445A CN105038445A CN201410835863.0A CN201410835863A CN105038445A CN 105038445 A CN105038445 A CN 105038445A CN 201410835863 A CN201410835863 A CN 201410835863A CN 105038445 A CN105038445 A CN 105038445A
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Abstract
The invention discloses an aqueous slurry material containing silicon dioxide aerosol, a preparation method and an application thereof. The aqueous slurry material is a stable dispersion system formed by uniformly mixing silicon dioxide aerosol powder, a surfactant, a bonding agent and water. The preparation method includes following steps: mixing water with the surfactant uniformly, adding the aerosol powder and mixing the mixture uniformly to obtain a suspension liquid, and adding the bonding agent and adding or not adding an additive, and uniformly mixing the mixture to obtain the aqueous slurry material. The aqueous slurry material is free of asbestos and other harmful fiber materials, is convenient to transport and construct, is free of cutting and can be easily controlled in thickness of a produced heat-insulating material, can be used through an optimized construction scheme freely, is simple in preparation process and low in cost, and is suitable for large-scale industrial production. The aqueous slurry material can be used for coating the surface of a base material and can form a coating after drying, which is flat in surface, is excellent in heat-insulating performance and is strong in bonding force, and also can be mixed with other structural materials to prepare an aqueous composite material.
Description
Technical field
The present invention relates to a kind of functional slurry, particularly a kind of water paste containing aerosil, its preparation method and application.
Background technology
Aerogel is the material obtained after the moisture of its inside being replaced into gas when keeping gel volume constant.Aerogel has the good characteristics such as low density, high porosity, high-ratio surface sum lower thermal conductivity.The preparation method of aerogel generally uses supercritical drying, but supercritical drying needs to carry out under comparatively high temps and elevated pressures, so use apparatus expensive, dangerous high, so constant pressure and dry technology is developed, publication No. is that patent discloses of CN103073008A and CN103043673A uses constant pressure and dry to prepare the method for aerogel, constant pressure and dry mild condition and also cost lower, the product that general constant pressure and dry obtains is particle and the powder of aerogel.The use of particle and powder has many inconveniences, and particularly powder discharges and is difficult to the problem of encapsulation.A kind of aerogel powder that uses that patent discloses of the patent No. to be the United States Patent (USP) of US2014/0273701A1 and publication No. be CN101124371 utilizes the technique of wet method felt to prepare the method for aerogel blanket, its aerogel blanket prepared can partly avoid aerogel powder powder in use to discharge and an encapsulation difficult problem, but cannot fundamentally solve powder release And Spread of Solute.The patent No. is that a kind of method that patent discloses aerogel thermospray of US2008/0241490A1 is to prepare aerogel heat-proof coating, it uses aerogel powder, low-temp ceramics powder and organic binder bond to be mixed with out thermal spray feedstock, and aerogel thermospray is being obtained heat insulating coat to metal substrate surface.This technical equipment is complicated, and in spraying process, high molecular molten state can make polymer enter aerogel hole, makes aerogel degradation.Use Size Technology can effectively solve aerogel powder release And Spread of Solute, be convenient to transport and the use of material, aerogel slurry is widely used simultaneously, and both may be used for coated material and also can be applied in cement, the structured material compounds such as gypsum prepare matrix material.Publication No. is the preparation method that patent reports a kind of aerogel heat-proof coating of CN102719129A, but this method needs first hydrophobic aerogel to be modified as wetting ability aerogel, be redispersed in water and prepare water-borne coatings, this kind of procedure is loaded down with trivial details and be difficult to the hydrophobic hydrophilic nmature controlling aerogel.
Summary of the invention
An object of the present invention is to propose a kind of water paste containing aerosil, to overcome deficiency of the prior art.
Two of object of the present invention is the preparation method providing a kind of water paste containing aerosil, it is without the need to aerogel modifying surface, but directly use aerogel powder and tensio-active agent and binding agent to be mixed with out the slurry with suitable viscosity and good coating property, and slurry can become the coating that surface uniform, adhesive power are very strong, thermal insulation is good by this.
Three of object of the present invention is to provide the described application containing aerosil.
For realizing aforementioned invention object, present invention employs following technical scheme:
Containing a water paste for aerosil, it is the stable dispersion be uniformly mixed to form primarily of silicon dioxide aerogel powder, tensio-active agent, binding agent and water.
Comparatively preferred, the described water paste containing aerosil comprises the following component calculated by weight: 30 ~ 80 parts, water, aerosil 5 ~ 30 parts, 0 ~ 10 part, tensio-active agent, binding agent 2 ~ 30 parts.
Further, described aerogel powder adopts hydrophobic silicon dioxide aerogel, and the particle diameter of described aerogel powder is preferably 0.1 μm ~ 500 μm, is especially preferably 50 ~ 100 μm.
Containing a preparation method for the water paste of aerosil, comprising: by silicon dioxide aerogel powder, tensio-active agent, binding agent and water Homogeneous phase mixing, form described water paste.
Further, described preparation method comprises:
(1) water is mixed with tensio-active agent, form mixed solution;
(2) in described mixed solution, add silicon dioxide aerogel powder, mix, form suspension;
(3) auxiliary agent adding binding agent in described suspension and can select interpolation or not add, mixes, forms described water paste.
The aforementioned water paste containing aerosil can in order to prepare heat insulating coat.
Compared with prior art, advantage of the present invention is at least:
(1) water paste (following be called for short " aerogel slurry " or " slurry ") containing aerosil that prepared by the present invention is water paste, organic solvent-free composition, and cost is lower and pollute little;
(2) the aerogel powder particle diameter of the present invention's use is between 0.1 μm ~ 500 μm, serious for traditional aerogel material (as aerogel blanket and aerogel plate) dry linting when cutting and install, operator need very strict protection and proofing dust and protecting, and the powder release And Spread of Solute using slurry of the present invention effectively to avoid in traditional aerogel use procedure;
(3) traditional aerogel blanket and aerogel plate can only be used for the heat insulation construction of irregular figure, as metope or pipeline, but for the heat insulation process of complex configuration, aerogel blanket and aerogel plate are just difficult to construction, simultaneously aerogel blanket and aerogel plate in use cannot to be avoided between felt and felt or the thermosteresis of seam crossing between plate and plate, and the contact heat bridge of base and lagging material loses, aerogel slurry of the present invention is when applying, aforementioned drawback can be overcome completely, and by adopting paint-on technique that aerogel coating and substrate can be made very firmly to bond, seamless combination can be accomplished simultaneously, thermosteresis can drop to minimum,
(4) preparation technology of aerogel slurry of the present invention only uses and utilizes simple agitation device etc., preparation technology is simple, and equipment investment is low, is suitable for carrying out large-scale industrial production, and the producing apparatus of traditional aerogel blanket and aerogel plate is expensive, complicated process of preparation;
(5) the aerogel slurry construction that prepared by the present invention can use brushing, the multiple constructional method such as roller coating and spraying, the thickness of thermofin can between 0.05mm ~ 10mm, and gauge control is easy, and construction is simple, and the thermofin heat-proof quality formed is excellent, difficult drop-off, surfacing, corrosion-and high-temp-resistant, not easily aging, long service life.
Accompanying drawing explanation
Fig. 1 is preparation technology's schematic flow sheet of a kind of water paste containing aerosil in the present invention one typical embodiments (following abbreviation " aerogel slurry ");
Fig. 2 is the photo of aerogel slurry prepared by the embodiment of the present invention 1;
Fig. 3 is aerogel coating photo prepared by the embodiment of the present invention 1;
Fig. 4 is the SEM photo of aerogel coating prepared by the embodiment of the present invention 1.
Embodiment
As previously mentioned, in view of many deficiencies of prior art, inventor, through a large amount of research and practice, is proposed technical scheme of the present invention, is illustrated as follows.
One aspect of the present invention provides a kind of water paste containing aerosil, and it is the stable dispersion be uniformly mixed to form primarily of silicon dioxide aerogel powder (following abbreviation " aerogel powder "), tensio-active agent, binding agent and water.
Further, described aerogel powder adopts hydrophobic silicon dioxide aerogel.
Preferably, the particle diameter of described aerogel powder is 0.1 μm ~ 500 μm, and particularly preferably, the particle diameter of described aerogel powder is 50 ~ 100 μm, and density is between 0.04 ~ 0.25g/ml, and porosity is between 80% ~ 99%, and specific surface is at 500m
2/ g ~ 2000m
2between/g.
Further, described water can be selected from deionized water or tap water.
If what use is tap water, then can uses dead-soft water, soft water and middle hard water, and high hardness and superelevation hard water must not be used.Meanwhile, pH value should not be used to be less than 5 or the pH value acidity and the alkaline water that are greater than 9.
As one of better embodiment, described slurry contains 30wt% ~ 80wt% water.
Further, described tensio-active agent can be selected from anionic, cationic or nonionic surface active agent, such as cetalkonium chloride, cetylpyridinium bromide, hexadecylpyridinium chloride, cetyl trimethylammonium bromide, the cats products such as palmityl trimethyl ammonium chloride, such as Seconary Alkane Sulphonate Sodium, Seconary Alkane Sulphonate Sodium, alkylbenzene sulfonate, the mixture of Teepol and sodium alkyl benzene sulfonate, the anion surfactants such as Teepol, such as sucrose monolaurate, sucrose-mono-oleate, sucrose palmitic acid ester, polyglycol distearate, polyoxyethylene nonylphenol ether, the nonionogenic tensides such as fatty alcohol-polyoxyethylene ether, but be all not limited thereto.
Further, described binding agent is preferably from full aqueous binders, and more preferably, the organic content in described binding agent is less than 2wt%.
Wherein, described binding agent is optional from polyvinyl alcohol, water-borne acrylic resin, aqueous polyurethane, aqueous epoxy resins, aqueous fiber element, ACRYLIC EMULSION, epoxy resin latex, organic silicon emulsion etc., but is not limited thereto.
As one of better embodiment, described slurry contains 2wt% ~ 30wt% binding agent.
Further, described water paste also can comprise the auxiliary agent can selecting to add or do not add, such as softening agent, film coalescence aid etc.
Wherein, described softening agent is optional from poly(oxyethylene glycol) 400, Polyethylene Glycol-600, poly-normal-butyl (dibutyl) ethene, dibutyl phthalate, butyl stearate, methyl abietate, Tritolyl Phosphate, propylene carbonate, described film coalescence aid can be selected from propandiol butyl ether, 1-Methoxy-2-propyl acetate, but is all not limited thereto.
Slurry of the present invention can be uniform and stable white slurry, and certainly, for adapting to the needs of practical application, those skilled in the art also by applying appropriate pigment etc. in the slurry, and change the color etc. of this slurry.
Slurry of the present invention is compared with other aerogel products, and not containing harmful filamentary materials such as asbestos, transport and easy construction, do not need the thickness cutting and can control easily lagging material, can the optimized arrangement and method for construction of unrestricted choice.
The preparation method that another aspect provides a kind of water paste containing aerosil comprises: by silicon dioxide aerogel powder, tensio-active agent, binding agent and water Homogeneous phase mixing, form described water paste.
Refer to Fig. 1, as a typical embodiments of the present invention, containing the preparation method of the water paste of aerosil, should comprise:
(1) water is mixed with tensio-active agent, form mixed solution (mixing solutions 1);
(2) in described mixed solution, add silicon dioxide aerogel powder, mix, form suspension (mixture 1),
(3) auxiliary agent adding binding agent in described suspension and can select interpolation or not add, mixes, forms described water paste (slurry 1).
Further, among this typical embodiments, can carry out de-bubble process depending on actual use needs after prepared by slurry 1, obtain slurry 2, wherein bubble removing method can adopt the method de-bubble of defrother or vacuum stirring.
Further, the blending means adopted in this preparation method is at least selected from ball milling, mechanical stirring, husky mill, ultrasonic blending means.
Step 1 of the present invention) blending means that adopts can be mechanical stirring, ball milling, the blending meanss such as husky mill.For Ball milling, planetary ball mill can be used, tumbling ball mill etc.For mechanical stirring, comparatively preferably, stirring velocity can control between 50rpm ~ 2000rpm, and mixing time controls between 30min ~ 2h.
Step 2 of the present invention) in aerogel be hydrophobic silicon dioxide aerogel powder, morphology microstructure can be spherical or irregularly shaped, and diameter of particle controls between 0.1 μm ~ 500 μm.In order to keep best coating performance, especially preferably use the aerogel powder of diameter of particle between 50 ~ 100 μm,
Step 2 of the present invention) in blending means can be mechanical stirring, comparatively preferably, stirring velocity between 50rpm ~ 1000rpm, churning time between 3min ~ 3h, be preferably 5min ~ 2h.Further, flying upward and discharging in order to avoid aerogel powder in whipping process, should use closed charging and totally-enclosed stirring.
Step 3 of the present invention) in blending means can be mechanical stirring, ball milling, the blending meanss such as husky mill.
Another aspect of the invention additionally provides any one water paste containing aerosil aforementioned and is preparing the application in heat insulating coat.
Another aspect of the invention additionally provides a kind of preparation method of heat insulating coat, comprising: any one water paste containing aerosil aforementioned is directly coated in substrate surface and forms heat insulating coat.
Further, the preparation method of described heat insulating coat can comprise: one or more times the described water paste containing aerosil is directly coated in substrate surface, each smearing thickness is at below 1mm, and time of drying is within 5h.
Another aspect of the invention provides a kind of heat insulating coat utilizing any one method aforementioned to be formed, and the thickness of described heat insulating coat is 0.05mm ~ 10mm.Certainly, coat-thickness also can adjust according to practical situation, such as, can control between 50 μm to 5mm.
This heat insulating coat surface uniform, adhesive power is strong, and difficult drop-off, heat-proof quality is excellent, corrosion-and high-temp-resistant, not easily aging, long service life.
Another aspect of the invention provides a kind of article, the heat insulation structural comprising any one water paste containing aerosil aforementioned or utilize any one aerogel slurry aforementioned to be formed, such as heat insulating coat.
Wherein, a kind of thickness of representative heat coating is 0.05mm ~ 10mm, and thermal conductivity is 0.0246 ~ 0.0342W/mk, and working temperature is between-50 DEG C ~ 300 DEG C.
In addition, also it should be noted that, slurry of the present invention is except aforementioned applications, also aerogel composite can be mixed with other structured materials, such as, can as cement, isostructural heat insulation, the loss of weight additive of gypsum, also can prepare fibre composite with various filamentary material compound, addition can control in OK range depending on actual needs, such as, within 1wt% to 80wt%.
Below in conjunction with the technical solution of the present invention is further explained the explanation of some embodiments and accompanying drawing.
80g deionized water and 2g trolamine are used mechanical stirrer mixing by embodiment 1, stirring velocity 100rpm, churning time 5 minutes, be uniformly mixed liquid, 10g silicon dioxide aerogel powder is added in this mixed solution, powder density is 0.1g/ml, median size is 50 μm, stirring velocity is 500rpm, churning time is 30 minutes, the aerogel dispersion liquid of preparation should be the dispersion system that oyster white is stable, 5g polyvinyl alcohol 1500 is added again in this dispersion liquid, 1.5g poly(oxyethylene glycol) 400 and 1.5g dibutyl phthalate, mechanical stirrer is used to stir 30 minutes, stirring velocity is 200rpm, the slurry obtained de-bubble 20 minutes in froth in vacuum agent, de-bubble stirring velocity is 10rpm, vacuum tightness is 0.08atm.Obtain aerogel water paste, slurry viscosity is 2000mPa/s.Adopt the method for spraying to be sprayed into aluminum alloy bottom plate in aerogel slurry, spraying thickness 0.5mm, dry 10 hours, the thermal conductivity of coating was 0.045W/mk.
20g deionized water and 2g trolamine are used mechanical stirrer mixing by embodiment 2, stirring velocity 100rpm, churning time 5 minutes, be uniformly mixed liquid, 10g silicon dioxide aerogel powder is added in this mixed solution, powder density is 0.1g/ml, median size is 50 μm, stirring velocity is 500rpm, churning time is 30 minutes, the aerogel dispersion liquid of preparation should be the dispersion system that oyster white is stable, in this dispersion liquid, add 64g goes ACRYLIC EMULSION and 20g water and 4gTexanol to use mechanical stirrer to mix 10 minutes, stirring velocity is 200rpm.The slurry obtained de-bubble 20 minutes in froth in vacuum agent, de-bubble stirring velocity is 10rpm, and vacuum tightness is 0.08atm.Obtain aerogel water paste, slurry viscosity is 3500mPa/s.Adopt the method for spraying to be sprayed into aluminum alloy bottom plate in aerogel slurry, spraying thickness is 0.5mm, and dry 10 hours, the thermal conductivity of coating was 0.05W/mk.
64 parts of ACRYLIC EMULSION and 20 parts of water and 4 parts of Texanol (mass ratio) use mechanical stirrer mixing 10min to uniform state by embodiment 3; Adding 2 parts of trolamines uses mechanical stirrer stirring 10min to become uniform state; Add 10 parts of aerogel powders, use mechanical stirrer to stir 30min; Obtain aerogel water paste.This aerogel slurry is coated in the low surface of glass-based, and thickness is between 500 μm of-5mm, and the thermal conductivity recorded by heat-pole method is between 0.0246 to 0.0312W/mK.Be coated on aluminium alloy plate by this aerogel slurry, thickness is between 50 μm to 5 μm, and the thermal conductivity recorded by heat-pole method is between 0.0246 to 0.0342W/mK.
80 parts of deionized waters and 1-5 part Sodium dodecylbenzene sulfonate (mass ratio) use mechanical stirrer to be uniformly mixed 10min to uniform state by embodiment 4; Add 5-10 part aerogel powder, use mechanical stirrer to stir 30min and obtain aerogel dispersion system; Add 2-10 part polyvinyl alcohol and 2 parts of dibutyl phthalates, use mechanical stirrer to stir 30min, obtain aerogel water paste.
60 parts of tap water and 1-3 part trolamine (mass ratio) use mechanical stirrer to be uniformly mixed 5min to uniform state by embodiment 5; Add 4-8 part aerogel powder, use mechanical stirrer to stir 30min and obtain aerogel dispersion system; Add 5-10 part polyvinyl alcohol, use mechanical stirrer to stir 30min, obtain aerogel water paste.
80 parts of tap water and 2-5 part Sodium dodecylbenzene sulfonate (mass ratio) use mechanical stirrer to be uniformly mixed 10min to uniform state by embodiment 6; Adding 1 part of trolamine uses mechanical stirrer to be uniformly mixed 5min to uniform state; Add 5-10 part aerogel powder, use mechanical stirrer to stir 30min, obtain aerogel water paste.
When adopt method shown in embodiment 1-3 to embodiment 4-6 obtain aerogel water paste heat conductivility test after, close test result can be obtained.
Should be appreciated that above explanation and the embodiment shown on drawing, the design philosophy surely of the present invention that is limited can not be resolved.Hold in technical field of the present invention identical know the knowledgeable can by technical thought of the present invention with various form improvement change, such improvement and change are interpreted as belonging in protection scope of the present invention.
Claims (13)
1., containing a water paste for aerosil, it is characterized in that it is the stable dispersion be uniformly mixed to form primarily of silicon dioxide aerogel powder, tensio-active agent, binding agent and water.
2. the water paste containing aerosil according to claim 1, it is characterized in that described aerogel powder adopts hydrophobic silicon dioxide aerogel, and the particle diameter of described aerogel powder is 0.1 μm ~ 500 μm, density is 0.04g/ml ~ 0.25g/ml, and porosity is 80% ~ 99%.
3. the water paste containing aerosil according to claim 1, is characterized in that described slurry contains 30wt%-80wt% water, 5wt% ~ 30wt% aerosil, 0 ~ 10wt% tensio-active agent, 2wt% ~ 30wt% binding agent.
4. the water paste containing aerosil according to claim 1, is characterized in that described tensio-active agent comprises anionic, cationic or nonionic surface active agent;
Wherein, described cationic surfactant is at least selected from cetalkonium chloride, cetylpyridinium bromide, hexadecylpyridinium chloride, cetyl trimethylammonium bromide, palmityl trimethyl ammonium chloride;
Described aniorfic surfactant is at least selected from mixture, the Teepol of Seconary Alkane Sulphonate Sodium, Seconary Alkane Sulphonate Sodium, alkylbenzene sulfonate, Teepol and sodium alkyl benzene sulfonate;
Described nonionogenic tenside is at least selected from sucrose monolaurate, sucrose-mono-oleate, sucrose palmitic acid ester, polyglycol distearate, polyoxyethylene nonylphenol ether, fatty alcohol-polyoxyethylene ether.
5. the water paste containing aerosil according to claim 1, it is characterized in that described slurry contains 2wt% ~ 30wt% binding agent, and the organic content in described binding agent is less than 2wt%.
6. according to claim 1 or 5 containing the water paste of aerosil, it is characterized in that described binding agent is at least selected from polyvinyl alcohol, water-borne acrylic resin, aqueous polyurethane, aqueous epoxy resins, aqueous fiber element, ACRYLIC EMULSION, epoxy resin latex, organic silicon emulsion.
7. the water paste containing aerosil according to claim 1, it is characterized in that it also comprises auxiliary agent, described auxiliary agent comprises softening agent and/or film coalescence aid;
Wherein, described softening agent is at least selected from poly(oxyethylene glycol) 400, Polyethylene Glycol-600, poly-normal-butyl (dibutyl) ethene, dibutyl phthalate, butyl stearate, methyl abietate, Tritolyl Phosphate, propylene carbonate;
Described film coalescence aid is at least selected from propandiol butyl ether, 1-Methoxy-2-propyl acetate.
8. the water paste containing aerosil according to claim 1, is characterized in that it comprises the following component calculated by weight: 30 ~ 80 parts, water, aerosil 5 ~ 30 parts, 0 ~ 10 part, tensio-active agent, binding agent 2 ~ 30 parts.
9. according to any one of claim 1-8, contain the preparation method of the water paste of aerosil, it is characterized in that comprising:
(1) water is mixed with tensio-active agent, form mixed solution;
(2) in described mixed solution, add silicon dioxide aerogel powder, mix, form suspension;
(3) auxiliary agent adding binding agent in described suspension and can select interpolation or not add, mixes, forms described water paste.
10., according to claim 9 containing the preparation method of the water paste of aerosil, it is characterized in that the blending means adopted in the method is at least selected from ball milling, mechanical stirring, husky mill, ultrasonic blending means.
11., according to claim 9 containing the preparation method of the water paste of aerosil, is characterized in that, if the blending means adopted in step (1) is mechanical agitation methods, then stirring velocity is 50rpm ~ 2000rpm, and mixing time is 30min ~ 2h; If the blending means adopted in step (2) is mechanical agitation methods, then stirring velocity is 50rpm ~ 1000rpm, and churning time is 3min ~ 3h.
The heat insulating coat that 12. water pastes containing aerosil according to any one of claim 1-8 are formed, the thickness of described heat insulating coat is 0.05mm ~ 10mm, and thermal conductivity is 0.0246 ~ 0.0342W/mk, and working temperature is-50
oc ~ 300 DEG C.
13. 1 kinds of article, is characterized in that comprising the water paste containing aerosil according to any one of claim 1-8 or the heat insulation structural formed by described water paste.
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| CN201410835863.0A CN105038445A (en) | 2014-04-24 | 2014-12-29 | Aqueous slurry material containing silicon dioxide aerosol, preparation method and application thereof |
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| CN201410168770 | 2014-04-24 | ||
| CN201410835863.0A CN105038445A (en) | 2014-04-24 | 2014-12-29 | Aqueous slurry material containing silicon dioxide aerosol, preparation method and application thereof |
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