CN105776967A - Preparation method for fiber needled felt-enhanced sodium metaaluminate-modified aerogel - Google Patents
Preparation method for fiber needled felt-enhanced sodium metaaluminate-modified aerogel Download PDFInfo
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- CN105776967A CN105776967A CN201610067295.3A CN201610067295A CN105776967A CN 105776967 A CN105776967 A CN 105776967A CN 201610067295 A CN201610067295 A CN 201610067295A CN 105776967 A CN105776967 A CN 105776967A
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- needled felt
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- 239000000835 fiber Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 44
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 42
- 239000011734 sodium Substances 0.000 title claims abstract description 42
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims abstract description 39
- 239000004964 aerogel Substances 0.000 title abstract description 9
- 239000000243 solution Substances 0.000 claims abstract description 51
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 34
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 30
- 239000011347 resin Substances 0.000 claims abstract description 28
- 229920005989 resin Polymers 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000002904 solvent Substances 0.000 claims abstract description 17
- 239000011240 wet gel Substances 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 10
- -1 sodium metaaluminate-modified water glass Chemical class 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 239000011259 mixed solution Substances 0.000 claims abstract description 7
- 238000012986 modification Methods 0.000 claims abstract description 7
- 230000004048 modification Effects 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 239000010881 fly ash Substances 0.000 claims description 11
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 10
- 238000002386 leaching Methods 0.000 claims description 8
- 230000007935 neutral effect Effects 0.000 claims description 8
- 239000000499 gel Substances 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000001117 sulphuric acid Substances 0.000 claims description 5
- 235000011149 sulphuric acid Nutrition 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 230000001476 alcoholic effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- 239000012065 filter cake Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 229910000358 iron sulfate Inorganic materials 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 238000007885 magnetic separation Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 125000005401 siloxanyl group Chemical group 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 229920000784 Nomex Polymers 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000011324 bead Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000010883 coal ash Substances 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims description 2
- 239000004763 nomex Substances 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 239000002243 precursor Substances 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 239000008213 purified water Substances 0.000 abstract 1
- 229920006395 saturated elastomer Polymers 0.000 abstract 1
- 239000002585 base Substances 0.000 description 4
- 238000010790 dilution Methods 0.000 description 4
- 239000012895 dilution Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 238000001467 acupuncture Methods 0.000 description 2
- 150000004703 alkoxides Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000004966 Carbon aerogel Substances 0.000 description 1
- 239000004965 Silica aerogel Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/005—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing gelatineous or gel forming binders, e.g. gelatineous Al(OH)3, sol-gel binders
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/32—Alkali metal silicates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
Abstract
The invention provides a preparation method for fiber needled felt-enhanced sodium metaaluminate-modified aerogel.The preparation method comprises the steps that a water glass solution is purified with resin treated through an acid-base solution, and a sodium metaaluminate solution is dropwise added into the purified water glass solution under the stirring condition; fiber needed felt is completely immersed into a precursor mixed solution to adsorb the solution to be saturated, standing is performed for 30 min for automatic gelling, and fiber needled felt-enhanced sodium metaaluminate-modified water glass wet gel is obtained; the obtained fiber needled felt-enhanced sodium metaaluminate-modified water glass wet gel is subjected to solvent replacement, heat preservation, modification and drying, and then the fiber needled felt-enhanced sodium metaaluminate-modified water glass aerogel is obtained.The simple preparation technology for the glass water aerogel which is modified by sodium metaaluminate and enhanced by the fiber needled felt is supplied; the whole preparation method is simple, easy to control, free of strong acid and strong base corrosion, low in requirement for equipment and suitable for industrialized production after the process is amplified.
Description
Technical field
The preparation method that the present invention relates to a kind of aeroge, is specifically related to the preparation method that a kind of fiber needled felt strengthens the modified aeroge of sodium metaaluminate.
Background technology
Aeroge is the material that in solid matter, heat conductivity is minimum, is only slightly higher than vacuum, is approximately 0.013W/m K.Aeroge also has extremely low density, is the minimum solid of the density generally acknowledged in the world, and least density can accomplish 3kg/m3, more slightly higher than the density of air.Therefore aeroge is the insulation material that heat insulation effect is best in the world, density is minimum.
The kind of current aeroge is more, has carbon aerogels, silicon system aeroge, alumina aerogels etc..The preparing raw material and can adopt tetraethyl orthosilicate or waterglass of silica aerogel, preparation technology can be respectively adopted non-pressure process and supercritical, and its preparation technology is highly developed.The preparation of alumina aerogels, mainly alkoxide process, drying process adopts supercritical process substantially.And the preparation of silica/alumina composite aerogel, rarely having report, even if being prepared into pluralgel, being also adopt alkoxide process to carry out gel.
Raw material adopts tetraethyl orthosilicate, and cost of material is expensive；Sol gel process is complicated, and technique is amplified relatively costly.Adopting waterglass in prior art, the heat conductivity of the aeroge of preparation and density are all not ideal enough, and technical process is also more complicated.
Summary of the invention
Simple in order to obtain preparation technology, the high-quality aeroge that cost is low, the present invention proposes the preparation method that a kind of fiber needled felt strengthens the modified aeroge of sodium metaaluminate.
In order to achieve the above object, the invention provides employing following technical proposals:
The preparation method that a kind of fiber needled felt strengthens the modified aeroge of sodium metaaluminate is as follows:
(1) the resin purification water glass solution processed with acid-base solution, the solution ph obtained is 2～3；
(2) when stirring, being added drop-wise to by sodium aluminate solution in the solution that step (1) obtains, the pH value regulating mixed solution is 4～5；
(3) fiber needled felt is completely immersed in forerunner's mixed solution, adsorbs full, stand 30min, automatic gel, obtain fiber needled felt and strengthen the waterglass wet gel that sodium metaaluminate is modified, at room temperature aging 12h；
(4) solvent displacement is carried out, fiber needled felt step (3) obtained strengthens the modified waterglass wet gel of sodium metaaluminate and immerses alcoholic solution, and through insulation, solvent is replaced, modified, namely obtain fiber needled felt after drying and strengthen the waterglass aeroge that sodium metaaluminate is modified.
A kind of fiber needled felt strengthens the first preferred version of the preparation method of the modified aeroge of sodium metaaluminate, and resin processes through acid-base solution: soaking resin with the hydrochloric acid solution of mass concentration 3～4%, volume ratio is 1:2～4, and the time is more than 4h；Resin is cleaned to neutral with deionized water；Soaking resin with the sodium hydroxide solution of 3～4% concentration, volume ratio is approximately 1:2～4, and soak time is more than 4h, cleans resin to neutral with deionized water；Finally, repeat to process a resin with the hydrochloric acid solution that mass concentration is 3～4%, clean to neutral.
A kind of fiber needled felt strengthens the second preferred version of the preparation method of the modified aeroge of sodium metaaluminate, and the quality proportioning of waterglass dilute solution is deionized water: waterglass=2～4:1.
A kind of fiber needled felt strengthens the 3rd preferred version of the preparation method of the modified aeroge of sodium metaaluminate, and the preparation method of waterglass is as follows:
1) magnetic bead in magnetic separation separation of fine coal ash；
2) mechanical grinding；
3) acidleach: at 150 DEG C～220 DEG C, mixes flyash with the sulphuric acid that concentration is 80%～98% with the ratio that solid-to-liquid ratio is 2:1～1:1 of sulphuric acid in flyash, reacts 4～6h；
4) solid-liquid separation: after reactant is cooled to room temperature, it is that 1:2～1:6 preparation adds water by the solid-to-liquid ratio of flyash Yu water, at 75～95 DEG C, after stirring 1～3h, sucking filtration, the filter cake water washing that solid-to-liquid ratio is 2:1～1:2 by flyash Yu water, obtains the solution of iron sulfate and aluminum sulfate and high silicon acid leaching residue；
5) acid leaching residue prepares waterglass: by acid leaching residue and 9%～12% soda lye by the proportions mixed liquor that solid-to-liquid ratio is 1:1～1:2, heat after 6～10h in reactor at 160～200 DEG C, be cooled to room temperature, filter and wash solid slag with water.
A kind of fiber needled felt strengthens the 4th preferred version of the preparation method of the modified aeroge of sodium metaaluminate, and the mass concentration of sodium aluminate solution is 10%.
A kind of fiber needled felt strengthens the 5th preferred version of the preparation method of the modified aeroge of sodium metaaluminate, and solvent displacement adopts ethanol, and hexane equal solvent, described holding temperature is 50～70 DEG C, and described solvent time swap is more than 8 hours.
A kind of fiber needled felt strengthens the 6th preferred version of the preparation method of the modified aeroge of sodium metaaluminate, and modified raw material adopts siloxanyl modified liquid, and modification temperature is 50～70 DEG C, and modification time is 7～9h.
A kind of fiber needled felt strengthens the 7th preferred version of the preparation method of the modified aeroge of sodium metaaluminate, dry employing constant pressure and dry technique.
A kind of fiber needled felt strengthens the 8th preferred version of the preparation method of the modified aeroge of sodium metaaluminate, and the heat conductivity of sial composite aerogel is 0.02～0.024W/ (m K), and density is 120～300kg/m3, water absorption rate is less than 3%.
A kind of fiber needled felt strengthens the 9th preferred version of the preparation method of the modified aeroge of sodium metaaluminate, the composite fibre Nomex that fiber needled felt is made up of glass fibre and polypropylene fibre, heated cure under pressure and get final product；The mass content of described glass fibre is 50～70%；The diameter of described glass fibre is 5～10um, and the diameter of described polypropylene fibre is 10～15um.
Compared with immediate prior art, technical scheme provided by the invention has following excellent effect:
1. the invention provides the preparation simple process through the modified waterglass aeroge with resin purification of sodium metaaluminate；
2. the raw material of the present invention is waterglass, and raw materials for production are cheap；
3. the gel process of the present invention be carry out mixture by material after, carry out gel reaction, it is to avoid the complicated technology of other aeroge collosol and gel；
4. the solvent of follow-up wet gel is replaced and modified, and process conditions are gentle, adapts to scale of mass production；
5. whole preparation method is simple and easy to control, corrodes without strong acid and strong base, low for equipment requirements, after technique is amplified, is suitable for industrialized production.
Detailed description of the invention
It is described in further detail below in conjunction with specific embodiment, technical scheme is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
The preparation method that fiber needled felt strengthens the modified aeroge of sodium metaaluminate is as follows:
(1) the resin purification water glass solution processed with acid-base solution, the solution ph obtained is 2～3；
(2) when stirring, being added drop-wise to by sodium aluminate solution in the solution that step (1) obtains, the pH value regulating mixed solution is 4～5；
(3) fiber needled felt is completely immersed in forerunner's mixed solution, adsorbs full, stand 30min, automatic gel, obtain fiber needled felt and strengthen the waterglass wet gel that sodium metaaluminate is modified, at room temperature aging 12h；
(4) solvent displacement is carried out, fiber needled felt step (3) obtained strengthens the modified waterglass wet gel of sodium metaaluminate and immerses alcoholic solution, and through insulation, solvent is replaced, modified, namely obtain fiber needled felt after drying and strengthen the waterglass aeroge that sodium metaaluminate is modified.
The step of resin acid-alkali treatment is: use the hydrochloric acid solution of 3～4% mass concentrations, soak resin, volume ratio is approximately 1:2～4, time is more than 4h, deionized water is used to clean resin, until resin is neutral, then the sodium hydroxide solution by 3～4% concentration, soak resin, volume ratio is approximately 1:2～4, soak time is more than 4h, cleans resin with deionized water, until resin is neutral, finally, the hydrochloric acid solution re-using 3～4% mass concentrations repeats to process a resin, cleans to neutrality,.
Wherein, the dilution quality proportioning of waterglass is deionized water: waterglass=2～4:1；According to the waterglass of ratio requirement dilution, the pH value after resin purification is 2～3, it is desirable to be used for the volume filtering resin more than the volume of waterglass after dilution；The mass concentration of sodium aluminate solution is 10%, and the wet gel transparency is good, fully transparent, and light transmittance is more than 80%.
Committed step is to use sodium aluminate solution to regulate the pH value of solution after resin filter waterglass, when stirring, adds sodium aluminate solution, until pH value is 4～5, stands 30min.
When carrying out solvent displacement, the wet gel obtained being immersed alcoholic solution, is incubated 50～70 DEG C, solvent time swap is more than 8h.After solvent has been replaced, adopting siloxanyl modified liquid to be modified, modification temperature is 50～70 DEG C, and modification time is 7～9h.Finally, carry out normal pressure and dry dry, obtain aerogel particle.
The sodium aluminate solution of configuration, it is necessary to all dissolve, it is not possible to have impurity, solution requires transparent limpid, and sodium aluminate solution requires matching while using, can not long storage time；Waterglass is in the process of dilution, after adding a certain amount of deionized water, and more than magnetic agitation 5min, it is ensured that dilute solution mix homogeneously.
The preparation of waterglass: flyash is through 4 magnetic separation, then through mechanical grinding, mill speed is 1200r/min, the fine powder powder obtained after pulverizing 4min, then with 82% sulphuric acid mix by solid-to-liquid ratio 5:4, and at 200 DEG C react 4h；Reaction end is that 1:3 adds water by the solid-to-liquid ratio of flyash Yu water, is heated to 90 DEG C after being cooled to room temperature, stirs 2h, after sucking filtration obtains filter cake, and is that 1:1 washs by the solid-to-liquid ratio of flyash Yu water, obtains the solution of iron sulfate and aluminum sulfate and high silicon acid leaching residue；By the solid-to-liquid ratio of acid leaching residue Yu solution be 1:1 add concentration be the soda lye of 10.5%, and put into autoclave heat 10h, reaction temperature 180 DEG C；After being cooled to room temperature, filter and with a small amount of water washing solid slag, obtain waterglass.
The preparation of fiber needled felt: composite fibre glass fibre and polypropylene fibre formed introduces two rollers of filament throwing roller through guide eyelit, by the extruding mutually of two filament throwing rollers and rotation, multiple yarns is carried out top-down acupuncture with certain speed by the needle plate first passing through a rectangle subsequently, then with certain speed, multiple yarns is carried out acupuncture from bottom to top then through another rectangle needle plate, namely obtain fiber needled felt then through pressure roller.
Properties of product test different technical parameters prepared, is shown in following table.
Technological parameter in each embodiment of table 1 and performance test
Above example is only limited in order to technical scheme to be described; those of ordinary skill in the field are to be understood that; the specific embodiment of the present invention can being modified with reference to above-described embodiment or equivalent replacement, these are all being applied within the claims awaited the reply without departing from any amendment or equivalent replacement of spirit and scope of the invention.
Claims (10)
1. the preparation method that a fiber needled felt strengthens the modified aeroge of sodium metaaluminate, it is characterised in that
(1) the resin purification water glass solution processed with acid-base solution, the solution ph obtained is 2～3；
(2) when stirring, being added drop-wise to by sodium aluminate solution in the solution that step (1) obtains, the pH value regulating mixed solution is 4～5；
(3) fiber needled felt is completely immersed in forerunner's mixed solution, adsorbs full, stand 30min, automatic gel, obtain fiber needled felt and strengthen the waterglass wet gel that sodium metaaluminate is modified, at room temperature aging 12h；
(4) solvent displacement is carried out, fiber needled felt step (3) obtained strengthens the modified waterglass wet gel of sodium metaaluminate and immerses alcoholic solution, replaces through solvent, insulation, hydrophobically modified, namely obtains fiber needled felt after drying and strengthens the waterglass aeroge that sodium metaaluminate is modified.
2. the preparation method that a kind of fiber needled felt according to claim 1 strengthens the modified aeroge of sodium metaaluminate, it is characterized in that, described resin processes through acid-base solution: soaking resin with the hydrochloric acid solution of mass concentration 3～4%, volume ratio is 1:2～4, and the time is more than 4h；Resin is cleaned to neutral with deionized water；Soaking resin with the sodium hydroxide solution of 3～4% concentration, volume ratio is approximately 1:2～4, and soak time is more than 4h, cleans resin to neutral with deionized water；Finally, repeat to process a resin with the hydrochloric acid solution that mass concentration is 3～4%, clean to neutral.
3. the preparation method that a kind of fiber needled felt according to claim 1 strengthens the modified aeroge of sodium metaaluminate, it is characterised in that the quality proportioning of described water glass solution is deionized water: waterglass=2～4:1.
4. the preparation method that a kind of fiber needled felt according to claim 1 strengthens the modified aeroge of sodium metaaluminate, it is characterised in that the preparation method of described waterglass is as follows:
1) magnetic bead in magnetic separation separation of fine coal ash；
2) mechanical grinding；
3) acidleach: at 150 DEG C～220 DEG C, mixes flyash with the sulphuric acid that concentration is 80%～98% with the ratio that solid-to-liquid ratio is 2:1～1:1 of sulphuric acid in flyash, reacts 4～6h；
4) solid-liquid separation: after reactant is cooled to room temperature, it is that 1:2～1:6 preparation adds water by the solid-to-liquid ratio of flyash Yu water, at 75～95 DEG C, after stirring 1～3h, sucking filtration, the filter cake water washing that solid-to-liquid ratio is 2:1～1:2 by flyash Yu water, obtains the solution of iron sulfate and aluminum sulfate and high silicon acid leaching residue；
5) acid leaching residue prepares waterglass: by acid leaching residue and 9%～12% soda lye by the proportions mixed liquor that solid-to-liquid ratio is 1:1～1:2, heat after 6～10h in reactor at 160～200 DEG C, be cooled to room temperature, filter and wash solid slag with water.
5. the preparation method that a kind of fiber needled felt according to claim 1 strengthens the modified aeroge of sodium metaaluminate, it is characterised in that the mass concentration of described sodium aluminate solution is 10%.
6. the preparation method that a kind of fiber needled felt according to claim 1 strengthens the modified aeroge of sodium metaaluminate, it is characterized in that, the displacement of described solvent adopts ethanol, hexane equal solvent, described holding temperature is 50～70 DEG C, and described solvent time swap is more than 8 hours.
7. the preparation method that a kind of fiber needled felt according to claim 1 strengthens the modified aeroge of sodium metaaluminate, it is characterised in that the raw material of described hydrophobically modified adopts siloxanyl modified liquid, and modification temperature is 50～70 DEG C, and modification time is 7～9h.
8. the preparation method that a kind of fiber needled felt according to claim 1 strengthens the modified aeroge of sodium metaaluminate, it is characterised in that described dry employing constant pressure and dry technique.
9. the preparation method that a kind of fiber needled felt according to claim 1 strengthens the modified aeroge of sodium metaaluminate, it is characterized in that, it is 0.02～0.024W/ (m K) that described fiber needled felt strengthens the heat conductivity of the modified waterglass aeroge of sodium metaaluminate, and density is 120～300kg/m3, water absorption rate is less than 3%.
10. the preparation method that a kind of fiber needled felt according to claim 1 strengthens the modified aeroge of sodium metaaluminate, it is characterized in that, the composite fibre Nomex that described fiber needled felt is made up of glass fibre and polypropylene fibre, heated cure under pressure and get final product；The mass content of described glass fibre is 50～70%；The diameter of described glass fibre is 5～10um, and the diameter of described polypropylene fibre is 10～15um.
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Application publication date: 20160720 |