CN105367032A - Preparation method of nano heat preservation board - Google Patents
Preparation method of nano heat preservation board Download PDFInfo
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Abstract
The invention provides a preparation method of a nano heat preservation board. The method comprises the steps that silicon dioxide aerogel powder, an infrared screening agent and chopped fiber are evenly mixed to form a mixture, an ortho-silicic acid solution is sprayed to the mixture in a mist spraying mode, the obtained wet mixture forms a board material, and the board material is maintained through ammonia gas and dried to obtain the heat preservation board. According to the preparation method, due to the fact that the ortho-silicic acid solution is sprayed to the mixture in the mist spraying mode, the nano-porous structure of aerogel is preserved to the maximum limit, and it is ensured that the finally-obtained heat preservation board has the good heat preservation and heat insulation performance. In addition, chemical crosslinking of particles inside the heat preservation board is achieved through ammonia gas curing treatment, and the mechanical strength of the nano heat preservation board is greatly improved.
Description
Technical field
The present invention relates to nanometer heat insulating material technical field, being specifically related to a kind of take silicon dioxide aerogel powder as the preparation method of the nano thermal insulation plate of stopping composition.
Background technology
Along with the fast development of economic globalization, the mankind are sharply risen for the demand of the energy, the Energy utilization patterns of extensive style are more and more difficult to adapt to increasingly serious Energy situation, how to improve energy utilization rate, reduce the key subjects that energy consumption becomes countries in the world research.Particularly in China, high 2-5 times all of the same trade than developed country of the energy consumption of the industries such as generating, metallurgical smelting, petrochemical complex, architectural pottery, this present situation that energy utilization rate is generally low directly affects the paces of the sustainable fast development of national economy.
In general, the energy-conservation Canal Base in industrial production is originally divided into three major types: the first kind is advanced technical matters flow process; Equations of The Second Kind is advanced superior production unit; 3rd class is excellent energy-saving material.For energy-saving material, heat preserving and insulating material is a wherein investigation and application the largest class.According to the difference of material, heat preserving and insulating material can be further divided into again organic thermal insulation materials, inorganic thermal insulation material and metal heat insulation material, wherein, inorganic thermal insulation material conventional at present mainly concentrates on the micropore ceramics material of several microns to several millimeters with the aperture made by raw material such as ceramic fiber, whisker, ceramic hollow ball, the normal temperature thermal conductivity of this material is greater than 0.04W/ (mK) usually, and its heat-proof quality far can not meet the demand of effectively insulating field as the industry such as Aeronautics and Astronautics, boats and ships.In order to reduce the thermal conductivity of material, improving the heat-proof quality of material, needing ensureing that material has the aperture size basis of enough porositys reducing further material.
Along with the development of nanotechnology, aerogel material comes out, and it is a kind of nanoporous light material of structure-controllable, and the composition of 99% is by gas composition, make aerogel become the lightest solid matter of current known quality, be also the material that inorganic adiabatic field thermal conductivity is minimum simultaneously.Especially aerosil, its thermal conductivity is at normal temperatures and pressures 0.012-0.015W/ (mK), far below common inorganic thermal insulation material.But the physical strength of pure aerosil is low, poor toughness, causes the less stable of scantling, also limit its construction on operability.Therefore, how improving the mechanical property of silica aerogel material, is an important directions of present stage research.
Chinese patent literature CN101628804A discloses a kind of preparation method of aerogel heat-insulating composite material, comprise, tetraethoxy, dehydrated alcohol, deionized water, hydrochloric acid are made into silicon sol in molar ratio at 1: 10: 3: 0.015, add above-mentioned 8% silica aerogel powder, 3% titanium dioxide, 10% kaolin and 8% aluminum silicate fiber, then the ammoniacal liquor that concentration is 1% is added, employing pouring technology is shaping, and be placed in aged at room temperature 120 hours, carry out constant pressure and dry, namely obtained unit weight is 300kg/m
3, under normal temperature, thermal conductivity is the heat insulation composite material of 0.05W/ (mK).Above-mentioned technology by aerosil and kaolin, aluminum silicate fiber with the use of, and utilize the cohesive action of silicon sol, more shaping by pouring technology, be conducive to the physical strength improving material.
But in the above-described techniques, because the usage quantity of this liquid material composition of silicon sol is relative to aerosil powder, titanium dioxide, kaolin, the solid type composition such as aluminum silicate fiber, account for the 50-70% of total weight of material, so when solid type composition mixes with liquid material composition, ethanol in silicon sol, water equal solvent can enter in the nanoporous of aerogel in a large number, in follow-up drying treatment process, these solvents can evaporate again from the hole of aerogel, and the surface tension of solvent can destroy the microstructure of nanoporous aerogel powder during solvent evaporates, the space of material is finally caused to cave in, density increases, thus cause thermal and insulating performance to decline, therefore, above-mentioned prior art is difficult to prepare the better thermal insulation material of heat-proof quality.In addition, in above-mentioned technology, the consumption accounting of aerosil is too low, is difficult to equally prepare the better nano thermal insulation plate of heat-insulating property.Therefore, how improving to overcome above-mentioned technological deficiency to the proportioning raw materials of nano thermal insulation plate of the prior art and preparation method, is still this area technical barrier urgently to be resolved hurrily.
Summary of the invention
Technical problem solved by the invention is this defect that nano thermal insulation plate of the prior art can not have that heat-proof quality is good and physical strength is high concurrently, and then provides a kind of thermal and insulating performance good and the preparation method of the nano thermal insulation plate that physical strength is high.
For this reason, the present invention realizes the technical scheme of above-mentioned purpose and is:
A preparation method for nano thermal insulation plate, comprises the steps:
Mixing step: be 1 in mass ratio by silicon dioxide aerogel powder and infrared screening agent, chopped strand: (0.1-0.5): the ratio of (0.01-0.1) mixes, forms mixture;
The preparation process of positive silicate solution: in the presence of acid catalyst, by silicon ester and hydromassage you than being 1: the ratio of (18-36) mix, reacts under stirring, and the pH value of control reaction system is less than 3, standing, obtains positive silicate solution;
Moistening step: described positive silicate solution is sprayed on the described mixture be under whipped state in the mode of spraying, obtains moistening material; The add-on of described positive silicate solution is not more than 20% of the quality of described mixture;
Forming step: described moistening material is shaped to sheet material;
Curing step: in ammonia atmosphere, carries out maintenance process to described sheet material, obtains maintenance plate;
Drying step: drying treatment is carried out to described maintenance plate, i.e. obtained nano thermal insulation plate.
The particle diameter of described silicon dioxide aerogel powder is 500-1200 order, and aperture is 20-50nm.
The outer screening agent of described fibre is one or more in nanometer zirconium silicate, nano zircite, superfine titanium white, vacuum ceramic microballoon, nano-sized iron oxide or nano aluminium oxide; The granularity of wherein said superfine titanium white is 0.1-0.5 micron.
Described chopped strand is one or more in PET, glass fibre, basalt fibre, aluminum silicate fiber, high silica fiber or mullite fiber, and the length of described chopped strand is 6-30mm.
H in described acid catalyst
+volumetric molar concentration be 0.2mol/L; H in described acid catalyst
+be (0.025-0.2) with the mol ratio of described silicon ester: 5.
Described silicon ester is one or more in methyl silicate, tetraethoxy, positive silicic acid propyl ester or butyl silicate.
In described moistening step, the rotating speed stirring described mixture is 200-800r/min.
Described mixture is (2.5-3.5) with the ratio of the density of described sheet material: 1.
In the preparation process of described positive silicate solution, leave standstill 12-48h;
In described curing step, maintenance 24 hours;
In described drying step, temperature is 150-300 DEG C, and the time is 24 hours.
In described moistening step, also comprise, before adding described positive silicate solution, in the mode of spraying, binding agent is added in described mixture;
Described binding agent is aluminium dihydrogen phosphate aqueous solution and/or silicon sol, and the pH value of described binding agent is less than 3; In described aluminium dihydrogen phosphate aqueous solution, the mass content of aluminium dihydrogen phosphate is 66.7%; The mass ratio of described aluminium dihydrogen phosphate and described silicon sol is 3: 1.
Technique scheme tool of the present invention has the following advantages:
1, the preparation method of nano thermal insulation plate provided by the invention, initiatively using aerosil as the main raw material preparing warming plate, mix aerogel and infrared screening agent, chopped strand and forms mixture.Fine outer screening agent add the compound that its and aerosil can be made to produce molecular level, the good barrier effect impelling aerogel to give full play to its nano-porous structure to conduct heat to solid heat transfer and convection of air, while effectively can intercept infrared radiation heat transfer again; Chopped strand has structural re-enforcement, is conducive to improving the physical strength of warming plate in each dimension.
Preparation method of the present invention adopts the mode of spraying to be sprayed to by positive silicate solution on the mixture of solid type powder shaped initiatively, make positive silicate solution just can soak this mixture by constantly stirring, so in follow-up ammonia maintenance processes, can dehydration condensation be there is and form the silicon dioxide skeleton structure of 3 D stereo network in the activity hydroxy contained by positive silicic acid molecule being arranged in mixture surface, silicon dioxide aerogel powder can be filled in this skeleton completely, thus the compression moulding not being only a large amount of silicon dioxide aerogel powders provides possibility, the more important thing is the mechanical property also significantly improving warming plate.And, the present invention only can reach local state of saturation with the moistening material that spray pattern wet mix is formed, can prevent a large amount of solvent from entering in the nanoporous of aerosil like this, to avoid caving in of vesicular structure in drying process, thus effectively ensure that by the insulation heat-insulating property of the nano thermal insulation plate of aerogel obtained by stopping composition.To sum up, positive silicate solution is sprayed on mixture by adopting the mode of spraying by preparation method of the present invention, remains the nano-porous structure of aerosil to greatest extent, thus guarantees that final obtained warming plate possesses good insulation heat-insulating property.
Simultaneously, the sheet material shaping by moistening material is placed in ammonia and carries out maintenance process by preparation method of the present invention first, water in sheet material absorbs ammonia and produces hydroxide ion, the activity hydroxy generation dehydration condensation on itself and aerosil surface, achieve the chemically crosslinked between warming plate internal particle, considerably increase the internal structure power of warming plate, thus drastically increase the physical strength of warming plate.Thus, preparation method of the present invention perfection solves the warming plate that prior art prepared by aerosil and cannot have the defect that thermal and insulating performance is good and physical strength is high concurrently.
2, the preparation method of nano thermal insulation plate provided by the invention, by using aerosil as the main raw material preparing warming plate, for fiber, kaolin, because silica aerogel powder is as the subsidiary product in aerogel composite production process, its specification is difficult to unified, and fragility is high, be easy to produce airborne dust, be all that thus price is very cheap directly by offal treatment in the past, be conducive to the production cost reducing warming plate.
3, the preparation method of nano thermal insulation plate provided by the invention, the particle diameter limiting silicon dioxide aerogel powder is 500-1200 order, is conducive to realizing interparticle point cantact, increases the density of warming plate, thus improves its physical strength further.
4, the preparation method of nano thermal insulation plate provided by the invention, before adding positive silicate solution, is sprayed to binding agent on mixture in the mode of spraying, and preferred binder is aluminium dihydrogen phosphate aqueous solution and/or silicon sol; By adopting spray pattern to be evenly distributed on by binding agent between the particle of mixture, effectively achieve above-mentioned intergranular physical bond; The chemically crosslinked formed in ammonia maintenance treating processes with positive silicic acid matches, and makes preparation method of the present invention further can enhance the physical strength of warming plate.
Embodiment
Below in conjunction with specific embodiment, the preparation method to nano thermal insulation plate provided by the present invention is described in detail.In the following embodiments, wt% represents mass percentage.
Embodiment 1
The preparation method of the nano thermal insulation plate described in the present embodiment, comprises the steps:
(1) get the silica aerogel particles 10kg that aperture is 20-30nm, be ground into 500-700 object powder; Add superfine titanium white 3kg that particle diameter is 0.1-0.5 micron wherein, short glass fiber 0.2kg that length is 6-10mm, mix formation mixture;
(2) tetraethoxy 1kg is got, the ratio being 1: 18 in the mol ratio of tetraethoxy and water adds water about 2kg, then adds the dilution heat of sulfuric acid 0.5L of 0.1mol/L, stirs 30min and carries out reacting and the pH value controlling reaction system is less than 3, leave standstill 30 hours, obtained positive silicate solution;
(3) stir the mixture with 500r/min, be that positive silicate solution to be sprayed on mixture with this mixture of uniform wet in the mode of spraying by the ratio of 0.2: 1 in the mass ratio of positive silicate solution and mixture, obtain moistening material;
(4) with hydraulic efficiency installation by moistening material in dry powder aerated density: compacted density=3.5: the ratio of 1 carries out making sheet;
(5) obtained sheet material is placed in the curing room being connected with ammonia, maintenance process 24 hours, obtains maintenance plate;
(6) resting backplate is placed in high temperature kiln, drying treatment 24 hours at constant temperature 150 DEG C, obtained nano thermal insulation plate.
Embodiment 2
The preparation method of the nano thermal insulation plate described in the present embodiment, comprises the steps:
(1) get the silica aerogel particles 10kg that aperture is 30-50nm, be ground into 1000-1200 object powder; Add Nano-sized Ferric Oxide Powder 4kg wherein, length is 10-20mm shortly cuts mullite fiber 0.3kg, mix formation mixture;
(2) methyl silicate 1kg is got, the ratio being 1: 20 in the mol ratio of methyl silicate and water adds water about 2.1kg, then adds the dilute hydrochloric acid solution 0.8L of 0.2mol/L, stirs 30min and carries out reacting and the pH value controlling reaction system is less than 3, leave standstill 12 hours, obtained positive silicate solution;
(3) stir the mixture with 200r/min, be that positive silicate solution to be sprayed on mixture with this mixture of uniform wet in the mode of spraying by the ratio of 0.1: 1 in the mass ratio of positive silicate solution and mixture, obtain moistening material;
(4) with hydraulic efficiency installation by moistening material in dry powder aerated density: compacted density=3: the ratio of 1 carries out making sheet;
(5) obtained sheet material is placed in the curing room being connected with ammonia, maintenance process 24 hours, obtains maintenance plate;
(6) resting backplate is placed in high temperature kiln, microwave drying 24 hours at 200 DEG C, obtained nano thermal insulation plate.
Embodiment 3
The preparation method of the nano thermal insulation plate described in the present embodiment, comprises the steps:
(1) get the silica aerogel particles 10kg that aperture is 25-40nm, be ground into 600-1000 object powder; Add nano aluminium oxide 5kg wherein, length is that the short of 15-30mm cuts PET 0.3kg, mix formation mixture;
(2) butyl silicate 1kg is got, the ratio being 1: 19 in the mol ratio of butyl silicate and water adds water about 2.1kg, then adds the dilute nitric acid solution 1L of 0.2mol/L, stirs 30min and carries out reacting and the pH value controlling reaction system is less than 3, leave standstill 48 hours, obtained positive silicate solution;
(3) by aluminium dihydrogen phosphate: silicon sol: the mass ratio of water is the proportioning of 3: 1: 1.5, aluminium dihydrogen phosphate 1.2kg, silicon sol 0.4kg, water 0.6kg are mixed, the pH value of material of sizing mixing after stirring, to 2.5-3.0, obtains binding agent;
(4) stir the mixture with 800r/min, adopt the mode of spraying binding agent, positive silicate solution to be sprayed on mixture with by mixture uniform wet successively, obtain moistening material;
(5) with hydraulic efficiency installation by moistening material in dry powder aerated density: compacted density=2.5: the ratio of 1 carries out making sheet;
(6) obtained sheet material is placed in the curing room being connected with ammonia, maintenance process 24 hours, obtains maintenance plate;
(7) resting backplate is placed in high temperature kiln, drying treatment 24 hours at 300 DEG C, obtained nano thermal insulation plate.
Embodiment 4
The preparation method of the nano thermal insulation plate described in the present embodiment, comprises the steps:
(1) get the silica aerogel particles 10kg that aperture is 30-40nm, be ground into 800-1200 object powder; Add nanometer zirconium silicate 1kg wherein, length is 20-30mm shortly cuts aluminum silicate fiber 1kg, mix formation mixture;
(2) positive silicic acid propyl ester 1kg is got, the ratio being 1: 36 in the mol ratio of positive silicic acid propyl ester and water adds water about 4.2kg, then adds the dilute hydrochloric acid solution 0.125L of 0.2mol/L, stirs 30min and carries out reacting and the pH value controlling reaction system is less than 3, leave standstill 24 hours, obtained positive silicate solution;
(3) mixed by aluminium dihydrogen phosphate 1.2kg and water 0.6kg, the pH value of material of sizing mixing after stirring is not more than 3.0, obtains binding agent;
(4) stir the mixture with 600r/min, adopt the mode of spraying binding agent, positive silicate solution to be sprayed on mixture with by mixture uniform wet successively, obtain moistening material;
(5) with hydraulic efficiency installation by moistening material in dry powder aerated density: compacted density=2.5: the ratio of 1 carries out making sheet;
(6) obtained sheet material is placed in the curing room being connected with ammonia, maintenance process 24 hours, obtains maintenance plate;
(7) resting backplate is placed in high temperature kiln, drying treatment 24 hours at 225 DEG C, obtained nano thermal insulation plate.
Embodiment 5
The preparation method of the nano thermal insulation plate described in the present embodiment, comprises the steps:
(1) get the silica aerogel particles 10kg that aperture is 25-40nm, be ground into 850-1000 object powder; Add nano oxidized zirconium powder 2kg wherein, length is 8-15mm shortly cuts Black Warrior mineral wool 0.1kg, mix formation mixture;
(2) methyl silicate 1kg is got, the ratio being 1: 27 in the mol ratio of methyl silicate and water adds water about 3.1kg, then adds the dilute hydrochloric acid solution 0.56L of 0.2mol/L, stirs 30min and carries out reacting and the pH value controlling reaction system is less than 3, leave standstill 12 hours, obtained positive silicate solution;
(3) mixed by aluminium dihydrogen phosphate 1.2kg and water 0.6kg, the pH value of material of sizing mixing after stirring is not more than 3.0, obtains binding agent;
(4) stir the mixture with 400r/min, adopt the mode of spraying binding agent, positive silicate solution to be sprayed on mixture with by mixture uniform wet successively, obtain moistening material;
(5) with hydraulic efficiency installation by moistening material in dry powder aerated density: compacted density=3.2: the ratio of 1 carries out making sheet;
(6) obtained sheet material is placed in the curing room being connected with ammonia, maintenance process 24 hours, obtains maintenance plate;
(7) resting backplate is placed in high temperature kiln, drying 24 hours at 200 DEG C, obtained nano thermal insulation plate.
Embodiment 6
The preparation method of the nano thermal insulation plate described in the present embodiment, comprises the steps:
(1) get the silica aerogel particles 10kg that aperture is 20-30nm, be ground into 800-1100 object powder; Add vacuum ceramic microballoon 2kg wherein, length is 10-30mm shortly cuts high silica fiber 0.55kg, mix formation mixture;
(2) tetraethoxy 1kg is got, the ratio being 1: 27 in the mol ratio of methyl silicate and water adds water about 3.2kg, then adds the dilute hydrochloric acid solution 0.25L of 0.2mol/L, stirs 30min and carries out reacting and the pH value controlling reaction system is less than 3, leave standstill 12 hours, obtained positive silicate solution;
(3) secure ph is not more than the silicon sol 2.2Kg of 3.0, obtains binding agent;
(4) stir the mixture with 600r/min, adopt the mode of spraying binding agent, positive silicate solution to be sprayed on mixture with by mixture uniform wet successively, obtain moistening material;
(5) with hydraulic efficiency installation by moistening material in dry powder aerated density: compacted density=2.8: the ratio of 1 carries out making sheet;
(6) obtained sheet material is placed in the curing room being connected with ammonia, maintenance process 24 hours, obtains maintenance plate;
(7) resting backplate is placed in high temperature kiln, microwave drying 24 hours at 250 DEG C, obtained nano thermal insulation plate.
Comparative example 1
For the embodiment 1 in the preparation reference Chinese patent literature CN101628804A of the nano thermal insulation in this comparative example, difference is, replaces pouring technology with hydroforming process.
Comparative example 2
The preparation method of the nano thermal insulation plate described in this comparative example, comprises the steps:
(1) get the silica aerogel particles 10kg that aperture is 30-50nm, be ground into 600-1000 object powder; Add Nano-sized Ferric Oxide Powder 4kg wherein, length is 10-20mm shortly cuts mullite fiber 0.3kg, stirring and evenly mixing forms mixture;
(2) methyl silicate 1kg is got, the ratio being 1: 20 in the mol ratio of methyl silicate and water adds water about 2.1kg, then adds the dilute hydrochloric acid solution 0.8L of 0.2mol/L, stirs 30min and carries out reacting and the pH value controlling reaction system is less than 3, leave standstill 12 hours, obtained positive silicate solution;
(3) be added in positive silicate solution by the mixture of step (1), stir to obtain moistening material;
(4) with hydraulic efficiency installation by moistening material in dry powder aerated density: compacted density=3: the ratio of 1 carries out making sheet;
(5) obtained sheet material is placed in the curing room being connected with ammonia, maintenance process 24 hours, obtains maintenance plate;
(6) resting backplate is placed in high temperature kiln, microwave drying 24 hours at 200 DEG C, obtained nano thermal insulation plate.
Comparative example 3
The preparation method of the nano thermal insulation plate described in the present embodiment, comprises the steps:
(1) get the silica aerogel particles 10kg that aperture is 30-50nm, be ground into 1000-1200 object powder; Add Nano-sized Ferric Oxide Powder 4kg wherein, length is 10-20mm shortly cuts mullite fiber 0.3kg, mix formation mixture;
(2) methyl silicate 1kg is got, the ratio being 1: 20 in the mol ratio of methyl silicate and water adds water about 2.1kg, then adds the dilute hydrochloric acid solution 0.8L of 0.2mol/L, stirs 30min and carries out reacting and the pH value controlling reaction system is less than 3, leave standstill 12 hours, obtained positive silicate solution;
(3) stir the mixture with 200r/min, be that positive silicate solution to be sprayed on mixture with this mixture of uniform wet in the mode of spraying by the ratio of 0.1: 1 in the mass ratio of positive silicate solution and mixture, obtain moistening material;
(4) with hydraulic efficiency installation by moistening material in dry powder aerated density: compacted density=3: the ratio of 1 carries out making sheet;
(5) obtained sheet material is placed in high temperature kiln, microwave drying 24 hours at 200 DEG C, obtained nano thermal insulation plate.
Experimental example
Test according to the density of detection method to above-mentioned nano thermal insulation plate of GB GB/T5480-2008 defined; Test according to the thermal conductivity of detection method to above-mentioned nano thermal insulation plate of GB GB/T10295-2008 defined; Test the compressive strength of above-mentioned nano thermal insulation plate according to the detection method of GB/T5486-2008 defined, result is as shown in table 1:
The performance index of the nano thermal insulation plate that table 1 above-described embodiment and comparative example obtain
As can be seen from Table 1, the nano thermal insulation plate that embodiment of the present invention 1-6 obtains has less density, low thermal conductivity and high compressive strength, illustrates that preparation method of the present invention can obtain the good and nano thermal insulation plate that physical strength is high of heat-proof quality.Compared with comparative example 2, the thermal conductivity of the nano thermal insulation plate of embodiment 1-6 is lower, and the insulation heat-insulating property of preparation method of the present invention by adopting the feed way of spraying to contribute to improving material is described.And compared with comparative example 3, the compressive strength of the nano thermal insulation plate of embodiment 1-6 is larger, illustrate that preparation method of the present invention is conducive to strengthening the physical strength of sheet material by ammonia maintenance process.Especially compared with comparative example 1, the nano thermal insulation plate of embodiment 1-6 possesses less density and thermal conductivity, illustrates that preparation method of the present invention consists of and preparation technology optimizing materials, effectively can improve the heat-insulating property of nano thermal insulation plate.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (10)
1. a preparation method for nano thermal insulation plate, comprises the steps:
Mixing step: be 1 in mass ratio by silicon dioxide aerogel powder and infrared screening agent, chopped strand: (0.1-0.5): the ratio of (0.01-0.1) mixes, forms mixture;
The preparation process of positive silicate solution: in the presence of acid catalyst, by silicon ester and hydromassage you than being 1: the ratio of (18-36) mix, reacts under stirring, and the pH value of control reaction system is less than 3, standing, obtains positive silicate solution;
Moistening step: described positive silicate solution is sprayed on the described mixture be under whipped state in the mode of spraying, obtains moistening material; The add-on of described positive silicate solution is not more than 20% of the quality of described mixture;
Forming step: described moistening material is shaped to sheet material;
Curing step: in ammonia atmosphere, carries out maintenance process to described sheet material, obtains maintenance plate;
Drying step: drying treatment is carried out to described maintenance plate, i.e. obtained nano thermal insulation plate.
2. preparation method according to claim 1, is characterized in that, the particle diameter of described silicon dioxide aerogel powder is 500-1200 order, and aperture is 20-50nm.
3. preparation method according to claim 1 and 2, is characterized in that, described infrared screening agent is one or more in nanometer zirconium silicate, nano zircite, superfine titanium white, vacuum ceramic microballoon, nano-sized iron oxide or nano aluminium oxide; The granularity of wherein said superfine titanium white is 0.1-0.5 micron.
4. the preparation method according to any one of claim 1-3, it is characterized in that, described chopped strand is one or more in PET, glass fibre, basalt fibre, aluminum silicate fiber, high silica fiber or mullite fiber, and the length of described chopped strand is 6-30mm.
5. the preparation method according to any one of claim 1-4, is characterized in that, H in described acid catalyst
+volumetric molar concentration be 0.2mol/L; H in described acid catalyst
+be (0.025-0.2) with the mol ratio of described silicon ester: 5.
6. the preparation method according to any one of claim 1-5, is characterized in that, described silicon ester is one or more in methyl silicate, tetraethoxy, positive silicic acid propyl ester or butyl silicate.
7. the preparation method according to any one of claim 1-6, is characterized in that, wets in step in described ravine, and the rotating speed stirring described mixture is 200-800r/min.
8. the preparation method according to any one of claim 1-7, is characterized in that, described mixture is (2.5-3.5) with the ratio of the density of described sheet material: 1.
9. the preparation method according to any one of claim 1-8, is characterized in that,
In the preparation process of described positive silicate solution, leave standstill 12-48h;
In described curing step, maintenance 24 hours;
In described drying step, temperature is 150-300 DEG C, and the time is 24 hours.
10. the preparation method according to any one of claim 1-9, is characterized in that, in described moistening step, also comprises, and before adding described positive silicate solution, is added in described mixture in the mode of spraying by binding agent;
Described binding agent is aluminium dihydrogen phosphate aqueous solution and/or silicon sol, and the pH value of described binding agent is less than 3; In described aluminium dihydrogen phosphate aqueous solution, the mass content of aluminium dihydrogen phosphate is 66.7%; The mass ratio of described aluminium dihydrogen phosphate and described silicon sol is 3: 1.
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| CN109293335A (en) * | 2018-11-01 | 2019-02-01 | 中山科邦化工材料技术有限公司 | A kind of high-strength heat-insulation plate and preparation method thereof |
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| CN110256035A (en) * | 2019-06-24 | 2019-09-20 | 广州晖能环保材料有限公司 | The preparation method and high-strength nano thermal insulation board of high-strength nano thermal insulation board |
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| CN102010179A (en) * | 2010-12-20 | 2011-04-13 | 中钢集团洛阳耐火材料研究院有限公司 | Method for preparing fiber-containing silicon dioxide aerogel composite thermal insulation material |
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| CN106565196A (en) * | 2016-11-22 | 2017-04-19 | 袁洁 | Inorganic mixed refractory material |
| CN109293335A (en) * | 2018-11-01 | 2019-02-01 | 中山科邦化工材料技术有限公司 | A kind of high-strength heat-insulation plate and preparation method thereof |
| CN109336538A (en) * | 2018-11-01 | 2019-02-15 | 中山科邦化工材料技术有限公司 | A kind of multiple layers of high strength heat-insulating heat-preserving material and preparation method thereof |
| CN110256035A (en) * | 2019-06-24 | 2019-09-20 | 广州晖能环保材料有限公司 | The preparation method and high-strength nano thermal insulation board of high-strength nano thermal insulation board |
| CN110639409A (en) * | 2019-09-17 | 2020-01-03 | 清华大学 | Method and device for preparing homogeneous catalyst slurry with controllable concentration |
| CN111590926A (en) * | 2020-06-15 | 2020-08-28 | 万华建筑科技（烟台）有限公司 | Preparation method of rock wool short fiber composite aerogel insulation board |
| CN113045284A (en) * | 2021-03-11 | 2021-06-29 | 山东茂盛管业有限公司 | Heat-insulating paving tile block based on nano aerogel particles and preparation method thereof |
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Effective date of registration: 20221026 Address after: Room 301, 3rd Floor, Building 3, No. 8, Chuangye Road, Economic and Technological Development Zone, Langfang City, Hebei Province, 065000 Patentee after: Hebei Jinna Low Carbon Materials Co.,Ltd. Address before: No. 8, Chuangye Road, Hebei Langfang Development Zone, Langfang City, Hebei Province 065,001 Patentee before: HEBEI JINNA TECHNOLOGY CO.,LTD. |