CN117599588A - Preparation method of silica gel core material for dehumidifying honeycomb rotating wheel - Google Patents
Preparation method of silica gel core material for dehumidifying honeycomb rotating wheel Download PDFInfo
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- CN117599588A CN117599588A CN202311613829.4A CN202311613829A CN117599588A CN 117599588 A CN117599588 A CN 117599588A CN 202311613829 A CN202311613829 A CN 202311613829A CN 117599588 A CN117599588 A CN 117599588A
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- glass fiber
- fiber paper
- honeycomb
- paper block
- silica gel
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 239000011162 core material Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000003365 glass fiber Substances 0.000 claims abstract description 140
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 63
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 62
- 238000001035 drying Methods 0.000 claims abstract description 53
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000741 silica gel Substances 0.000 claims abstract description 48
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 48
- 239000000835 fiber Substances 0.000 claims abstract description 24
- 239000005357 flat glass Substances 0.000 claims abstract description 22
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000001354 calcination Methods 0.000 claims abstract description 17
- 230000032683 aging Effects 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 14
- 230000007935 neutral effect Effects 0.000 claims abstract description 7
- 230000014759 maintenance of location Effects 0.000 claims abstract description 6
- 230000000379 polymerizing effect Effects 0.000 claims abstract description 6
- 238000007493 shaping process Methods 0.000 claims abstract description 6
- 239000011521 glass Substances 0.000 claims abstract 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 10
- 238000005098 hot rolling Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 239000011152 fibreglass Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 4
- 238000007598 dipping method Methods 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 238000007791 dehumidification Methods 0.000 abstract description 15
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 230000001413 cellular effect Effects 0.000 abstract 1
- 239000011148 porous material Substances 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 238000001179 sorption measurement Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000001569 carbon dioxide Substances 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002274 desiccant Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000000499 gel Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 239000000017 hydrogel Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- -1 wet silica gel) Chemical compound 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/28—Selection of materials for use as drying agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Drying Of Gases (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention provides a preparation method of a silica gel core material for cellular rotating wheel dehumidification, and belongs to the technical field of air dehumidification. The method comprises the steps of shaping corrugated paper rolled by glass fiber paper with alkaline silica sol, and bonding the corrugated paper with flat glass fiber paper while wet to form honeycomb glass fiber paper blocks; immersing the honeycomb glass fiber paper block in water glass, and drying to obtain a honeycomb glass fiber paper block loaded with water glass; putting the honeycomb glass fiber paper block loaded with water glass into a closed container, and introducing CO from the top 2 Gas, CO retention 2 The pressure of the gas is between 0.1 and 0.7Mpa, and the water glass and CO 2 Reacting to form silicic acid, polymerizing the silicic acid, and gelatinizing to form silica gel to obtain a silica gel-loaded honeycomb glass fiber paper block; honeycomb glass loaded with silica gelWashing the fiber paper block to be neutral, and aging in an acid solution with the pH value of 4-5 to obtain an aged honeycomb glass fiber paper block; and sequentially drying and calcining the aged honeycomb glass fiber paper block to obtain the silica gel core material for dehumidifying the honeycomb rotating wheel.
Description
Technical Field
The invention belongs to the technical field of air dehumidification, and particularly relates to a preparation method of a silica gel core material for honeycomb runner dehumidification.
Background
The environmental humidity has close relation to life and industrial and agricultural production of people, and the control of the humidity has very important significance for improving living conditions, developing production technology, guaranteeing production technology and improving product quality. The non-mechanical dehumidification control method for controlling humidity by using the humidity-regulating material has the advantages of high efficiency, low energy consumption, simple system, environmental protection and the like, and has become the main stream in the dehumidification field. The adsorption type honeycomb runner dehumidification system using the solid desiccant as a core material is characterized in that the solid desiccant is uniformly adhered to glass fiber paper or ceramic fiber to form a honeycomb block, and the desiccant after moisture absorption is regenerated for recycling, so that the whole dehumidification process is ensured to be continuously carried out. The adsorption equipment of the honeycomb rotary dehumidification system has the characteristics of simple structure, high operation reliability, large treatment air quantity, large moisture absorption quantity, high dehumidification efficiency, deep dehumidification and the like, and has wide market application prospect.
The most used solid desiccant in the honeycomb runner dehumidification system is silica gel and derivatives or compounds thereof, and the existing silica gel desiccant still has a plurality of defects as the honeycomb runner dehumidification material: on one hand, the pore structure distribution of main physical property parameters for determining the drying performance of the silica gel is further required to be optimized, so that the space for improving the dehumidifying performance is still relatively large; on the other hand, most of the current methods for preparing silica gel use sodium silicate and corrosive strong acid (sulfuric acid) as raw materials, so that sol attached to glass fiber paper in the preparation process easily enters into solution to cause less glue hanging amount on the glass fiber paper, the dehumidification efficiency is low, and meanwhile, a large amount of corrosive strong acid is used, so that the method is not environment-friendly.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for preparing a silica gel core material for dehumidifying a honeycomb rotary wheel. The preparation method provided by the invention is environment-friendly, and the obtained silica gel core material for dehumidifying the honeycomb runner has large specific surface area and pore volume, large adsorption capacity and large hanging capacity.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a preparation method of a silica gel core material for dehumidifying a honeycomb rotating wheel, which comprises the following steps:
shaping corrugated paper rolled by glass fiber paper with alkaline silica sol, and bonding the corrugated paper with flat glass fiber paper while wet to form honeycomb glass fiber paper blocks;
immersing the honeycomb glass fiber paper block in water glass, and drying to obtain a honeycomb glass fiber paper block loaded with water glass;
putting the honeycomb glass fiber paper block loaded with water glass into a closed container, and introducing CO from the top 2 Gas, CO retention 2 The pressure of the gas is between 0.1 and 0.7Mpa, and the water glass and CO on the honeycomb glass fiber paper block body 2 Reacting to form silicic acid, polymerizing the silicic acid, and gelatinizing to form silica gel to obtain a silica gel-loaded honeycomb glass fiber paper block;
washing the silica gel-loaded honeycomb glass fiber paper block to be neutral, and aging in an acid solution with the pH value of 4-5 to obtain an aged honeycomb glass fiber paper block;
and sequentially drying and calcining the aged honeycomb glass fiber paper block to obtain the silica gel core material for dehumidifying the honeycomb rotating wheel.
Preferably, the preparation of the honeycomb glass fiber paper block comprises the following steps: dipping the flat glass fiber paper in alkaline silica sol, and hot rolling the glass fiber paper dipped with the alkaline silica sol to obtain corrugated glass fiber paper; and sequentially and alternately laminating the corrugated glass fiber paper and the flat glass fiber paper to obtain the honeycomb glass fiber paper block.
Preferably, the concentration of the alkaline silica sol is 30-50%, and the average particle size of silica sol particles in the alkaline silica sol is 20-40 nm.
Preferably, the temperature of the hot rolling is 50 to 70 ℃.
Preferably, the concentration of the water glass is 35-50 wt% and the modulus is 2.0-4.0.
Preferably, the dipping time of the honeycomb glass fiber paper block body in the water glass is 3-15 min.
Preferably, the acid solution comprises a sulfuric acid solution or a hydrochloric acid solution;
the aging temperature is 40-60 ℃ and the aging time is 0.5-1.5 h.
Preferably, the sequentially drying and calcining comprises: sequentially performing first drying, first heating, second drying, second heating and calcination, wherein the temperature of the first drying is 30-50 ℃, and the heat preservation time is 0.5-1.5 h; the second drying temperature is 70-90 ℃ and the heat preservation time is 0.5-1.5 h; the calcining temperature is 160-190 ℃ and the heat preservation time is 1-3 h.
Preferably, the temperature for drying the honeycomb glass fiber paper block is 45-60 ℃, and the drying is carried out until no liquid water glass flows on the surface of the honeycomb glass fiber paper block.
Preferably, CO is introduced into the sealed container of the honeycomb glass fiber paper block body loaded with water glass 2 The gas comprises: placing the water glass honeycomb glass fiber paper block along the vertical direction of the honeycomb holes, and carrying out CO (carbon monoxide) 2 The gas enters through the openings above the honeycomb cells.
The invention provides a preparation method of a silica gel core material for dehumidifying a honeycomb rotating wheel, which comprises the following steps: shaping corrugated paper rolled by glass fiber paper with alkaline silica sol, and bonding the corrugated paper with flat glass fiber paper while wet to form honeycomb glass fiber paper blocks; immersing the honeycomb glass fiber paper block in water glass, and drying to obtain a honeycomb glass fiber paper block loaded with water glass; putting the honeycomb glass fiber paper block loaded with water glass into a closed container, and introducing CO from the top 2 Gas, CO retention 2 The pressure of the gas is between 0.1 and 0.7Mpa, and the water glass and CO on the honeycomb glass fiber paper block body 2 Reacting to form silicic acid, polymerizing the silicic acid, and gelatinizing to form silica gel to obtain a silica gel-loaded honeycomb glass fiber paper block; washing the silica gel-loaded honeycomb glass fiber paper block to be neutral, and aging in an acid solution with the pH value of 4-5 to obtain an aged honeycomb glass fiber paper block; and sequentially drying and calcining the aged honeycomb glass fiber paper block to obtain the silica gel core material for dehumidifying the honeycomb rotating wheel. The invention uses cheapValuable CO 2 The method replaces the corrosive strong acid used in the traditional process of preparing the silica gel drying material, avoids the corrosion of equipment caused by the use of sulfuric acid, ensures the safety of the production process, and in addition, the method utilizes CO 2 The penetrability and the heavier than air property of the gas are introduced from top to bottom, so that the CO can be promoted 2 The gas reacts with water glass attached to the inside and outside of the honeycomb glass fiber paper block in time to produce silicic acid, and the silicic acid molecules undergo polymerization reaction to form high-concentration silica sol, so that the high-concentration silica sol is further quickly condensed into silicic acid gel (i.e. wet silica gel), the silicic acid gel is not easy to fall off, the fusion of the silicon dioxide hydrogel and the glass fiber paper is completely realized, and the glue coating amount is large; the invention is realized by regulating CO 2 Regulating and controlling water glass and CO by pressure of gas 2 The reaction forms a reticular structure of silicic acid gel, so that the drying performance of the silica gel is regulated and controlled, and the silica gel on the honeycomb glass fiber paper block body is ensured to have good drying performance; aging in an acid solution to make silica gel particles loaded on the honeycomb glass fiber paper block uniform and into a stable space network structure.
Further, when the honeycomb glass fiber paper block is prepared, the flat glass fiber paper and the corrugated glass fiber paper are firmly bonded together by utilizing the adhesiveness of the alkaline silica sol, so that the surface structure is compact, the glass fiber paper has high strength, and the strength used on the honeycomb runner is met.
The preparation method of the invention has simple and convenient operation and cheap raw materials, provides a green process for preparing the silica gel core material for drying the honeycomb runner, and simultaneously provides a new way for carbon neutralization.
As can be seen from the example data, the silica gel core material for honeycomb runner prepared by the invention has good drying performance and specific surface area of 498-698 m 2 ·g -1 Pore volume of 0.26-0.48 mL.g -1 At RH of 5%, 30% and 50%, the adsorption amounts of the silica gel dry material are in the ranges of 45-98 mg/g, 103-158 mg/g and 212-276 mg/g, respectively.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a sheet glass fiber paper, corrugated glass fiber paper rolled by alkaline water glass sizing, and a honeycomb glass fiber paper block made;
FIG. 2 is N of silica gel core materials prepared in examples 1 to 3 and comparative example 1 2 Adsorption and desorption isothermal curves and pore size distribution curves.
Detailed Description
The invention provides a preparation method of a silica gel core material for dehumidifying a honeycomb rotating wheel, which comprises the following steps:
shaping corrugated paper rolled by glass fiber paper with alkaline silica sol, and bonding the corrugated paper with flat glass fiber paper while wet to form honeycomb glass fiber paper blocks;
immersing the honeycomb glass fiber paper block in water glass, and drying to obtain a honeycomb glass fiber paper block loaded with water glass;
putting the honeycomb glass fiber paper block loaded with water glass into a closed container, and introducing CO from the top 2 Gas, CO retention 2 The pressure of the gas is between 0.1 and 0.7Mpa, and the water glass and CO on the honeycomb glass fiber paper block body 2 Reacting to form silicic acid, polymerizing the silicic acid, and gelatinizing to form silica gel to obtain a silica gel-loaded honeycomb glass fiber paper block;
washing the silica gel-loaded honeycomb glass fiber paper block to be neutral, and aging in an acid solution with the pH value of 4-5 to obtain an aged honeycomb glass fiber paper block;
and sequentially drying and calcining the aged honeycomb glass fiber paper block to obtain the silica gel core material for dehumidifying the honeycomb rotating wheel.
In the present invention, the raw materials used are commercially available products well known in the art, unless specifically described otherwise.
The corrugated paper rolled by the alkaline silica sol shaping glass fiber paper is bonded with the flat glass fiber paper while wet to form a honeycomb glass fiber paper block.
In the present invention, the preparation of the honeycomb glass fiber paper block shaped by the alkaline silica sol preferably comprises: and (3) immersing the flat glass fiber paper in alkaline silica sol, and hot rolling the glass fiber paper immersed with the alkaline silica sol to obtain the shaped corrugated glass fiber paper.
In the invention, the surface density of the flat glass fiber paper is preferably 50-200 g/m 2 More preferably 90 to 150g/m 2 。
In the present invention, the concentration of the alkaline silica sol is preferably 30 to 50%, more preferably 35 to 40%, and the average particle diameter of silica sol particles in the alkaline silica sol is preferably 20 to 40nm, more preferably 25 to 35nm. The invention has no special requirement on the dosage of the alkaline silica sol, and can completely immerse the flat glass fiber paper.
In the present invention, the temperature at which the hot rolling is performed is preferably 50 to 70 ℃, more preferably 55 to 65 ℃.
In the invention, corrugated glass fiber paper obtained after hot rolling is preferably laminated with flat glass fiber paper alternately in turn while the corrugated glass fiber paper is still wet, so as to obtain the honeycomb glass fiber paper block. In the invention, the honeycomb glass fiber paper block does not need any adhesive, directly utilizes the adhesive property of alkaline silica sol, firmly adheres the flat glass fiber paper and the corrugated glass fiber paper together before and after reaction, and forms the glass fiber paper with compact surface structure, high strength and burst index of more than 0.2kPa m 2 ·g -1 The strength used on the rotating wheel is completely satisfied.
In the present invention, the height of the honeycomb glass fiber paper block is preferably 70 to 100mm, more preferably 80 to 95mm. In an embodiment of the invention, the honeycomb fiberglass paper block has dimensions of 85mm by 85mm.
The invention dips the honeycomb glass fiber paper block into water glass, takes out and dries to obtain the honeycomb glass fiber paper block loaded with water glass. In the present invention, the concentration of the water glass is preferably 35 to 50wt%, more preferably 39 to 45wt%, and the modulus is preferably 2.0 to 4.0, more preferably 2.5 to 3.5. The invention controls the concentration and the modulus of the water glass in the above range, not only can ensure enough SiO 2 The content of the water glass can also ensure the viscosity of the water glass. Because ofThe higher the concentration is, the higher the viscosity of the water glass is, and the viscosity of the water glass can be reduced along with the extension of the standing time, so that the glue hanging of the honeycomb glass fiber paper block is not facilitated.
In the present invention, the immersion time of the honeycomb glass fiber paper block in water glass is preferably 3 to 15 minutes, more preferably 8 to 12 minutes.
In the present invention, the drying temperature is preferably 45 to 60 ℃, more preferably 50 to 55 ℃. And the surface of the honeycomb glass fiber paper block body is dried until no liquid water glass flows. The drying mode is not particularly limited in the present invention, and drying modes known to those skilled in the art, such as drying, may be used. When the honeycomb glass fiber paper block impregnated with water glass is dried, a certain water content is kept, so that the honeycomb glass fiber paper block is conducive to reaction with carbon dioxide, and the phenomenon that a liquid column is formed by flowing of the water glass to block a honeycomb channel is avoided.
After the honeycomb glass fiber paper block for loading water glass is obtained, the invention puts the honeycomb glass fiber paper block for loading water glass into a closed container, and CO is introduced from the top 2 Gas, CO retention 2 The pressure of the gas is between 0.1 and 0.7Mpa, and the water glass and CO on the honeycomb glass fiber paper block body 2 And (3) reacting to form silicic acid, polymerizing the silicic acid, and gelling to form silica gel, so as to obtain the silica gel-loaded honeycomb glass fiber paper block.
In the invention, CO is introduced into the honeycomb glass fiber paper block sealing container loaded with water glass 2 The gas preferably comprises: placing the honeycomb glass fiber paper block loaded with water glass along the vertical direction of honeycomb holes, and CO 2 The gas enters through the openings above the honeycomb cells. In an embodiment of the invention, CO is introduced into the sealed container of the honeycomb glass fiber paper block loaded with water glass 2 The method for gas specifically comprises the following steps: the honeycomb glass fiber paper block loaded with water glass is placed in a sealed high-pressure visual reactor with a thermometer, so that the honeycomb holes are along the vertical direction, the gas can flow along the pore direction, and carbon dioxide gas is introduced from the upper part of the reactor.
In the present invention, the CO 2 The pressure of the gas is preferably 0.1 to 0.7MPa, more preferably 0.2 to 0.5MPa. Carbon dioxide and glass fiber paper block attached to sameThe water glass reacts, heat is released in the reaction process, the temperature of a thermometer in the reactor starts to rise, and after the reaction is carried out for 0.5 to 1 hour, the temperature displayed by the thermometer is basically kept unchanged, so that the load silicic acid honeycomb glass fiber paper block is obtained. The invention utilizes CO 2 The penetrability of gas and the characteristic of heavier than air are introduced into the reactor from top to bottom, so that the timely reaction of water glass attached to the inside and outside of the honeycomb glass fiber paper block body is facilitated to produce silicic acid, the polymerization reaction between silicic acid molecules is carried out to form high-concentration silica sol, the high-concentration silica sol is further quickly condensed into silica gel (i.e. wet silica gel), the silica gel is not easy to fall off, the fusion of silica gel and glass fiber paper is completely realized, and the glue hanging amount is large. The invention is realized by controlling CO 2 The pressure, the rate of water glass neutralization reaction and the crystal nucleus amount of the silica gel are controlled to obtain the silica gel dry material with proper size and porosity and large specific surface area.
After obtaining a silica gel-loaded honeycomb glass fiber paper block, washing the silica gel-loaded honeycomb glass fiber paper block to be neutral, and aging in an acid solution with the pH value of 4-5 to obtain the aged honeycomb glass fiber paper block.
In the present invention, the washing liquid used for washing the silica gel-loaded honeycomb glass fiber paper block to neutrality is preferably clear water. The invention aims to wash out carbonate or bicarbonate generated after reaction to avoid silica gel falling off in the aging process. The washing mode is not particularly limited in the present invention, and washing modes well known to those skilled in the art can be used.
In the present invention, the acid solution preferably includes a sulfuric acid solution or a hydrochloric acid solution, and in the present invention, aging is preferably performed using the sulfuric acid solution. The aging temperature is preferably 40 to 60 ℃, more preferably 45 to 55 ℃, and the time is preferably 0.5 to 1.5 hours, more preferably 0.75 to 1 hour. The invention has no special requirement on the dosage of the acid solution, and can completely submerge the honeycomb glass fiber paper loaded with the silica gel. The newly generated gel on the honeycomb glass fiber paper block is very loose, and silica gel particles loaded on the honeycomb glass fiber paper block are uniform and form a stable space network structure through further aging, so that the silica particles are homogenized, and the space network structure of the silica hydrogel can be further reinforced, so that the collapse of the structure caused by the volatilization of moisture in the subsequent drying process is avoided, and the drying performance parameters of the prepared silica gel drying agent are influenced.
In the present invention, after the silica gel on the honeycomb glass fiber paper block is aged, the aged silica gel-loaded honeycomb glass fiber paper block is preferably further dried by filtration. The drying method is not particularly limited, and a drying method well known to those skilled in the art can be used.
The method comprises the steps of sequentially drying and calcining the aged honeycomb glass fiber paper block to obtain a silica gel loaded honeycomb glass fiber paper block, and obtaining a silica gel core material for dehumidifying the honeycomb rotating wheel.
In the present invention, the sequentially performing drying and calcination preferably includes sequentially performing first drying, first temperature rising, second drying, second temperature rising, and calcination. The temperature of the first drying is preferably 30-50 ℃, more preferably 35-45 ℃, and the heat preservation time is preferably 0.5-1.5 h, more preferably 0.75-1 h; the temperature of the second drying is preferably 70-90 ℃, more preferably 73-85 ℃, and the heat preservation time is preferably 0.5-1.5 h, more preferably 0.75-1 h; the calcination temperature is preferably 160 to 190 ℃, more preferably 170 to 185 ℃, and the heat preservation time is preferably 1 to 3 hours, more preferably 1.5 to 2.5 hours. The invention adopts sectional drying and calcination, the first two sections of low temperature are used for slowly drying water in the silicon dioxide hydrogel, so as to minimize the damage of the space network structure of the hydrogel, and the last section of temperature rise can remove the water in the structure, thereby improving the purity and the thermal stability of the generated silica gel.
The drying and calcining are preferably carried out in the muffle furnace air atmosphere with programmed temperature rise, and the first temperature rise and the second temperature rise are preferably carried out at a speed of 2 ℃/min.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific examples, and the described embodiments are only some embodiments of the present invention, but not all embodiments. Any modification, equivalent replacement, improvement, etc. of the embodiments of the present invention without making any creative effort shall fall within the protection scope of the present invention according to the technical spirit and general principles of the present invention.
Example 1
The surface density was 100g/m by impregnating with an alkaline silica sol having an average particle diameter of 30nm and a concentration of 40% as a setting agent 2 Rolling the flat glass fiber paper into corrugated glass fiber paper on a hot rolling machine, and then, staggering and laminating the rolled corrugated glass fiber paper and the flat glass fiber paper together to form a honeycomb glass fiber paper block with the thickness of 85mm multiplied by 85mm. The physical photographs of the flat glass fiber paper, the rolled corrugated glass fiber paper and the prepared honeycomb glass fiber paper are shown in fig. 1.
And (3) immersing the prepared honeycomb glass fiber paper block in water glass with the modulus of 3.2 and the concentration of 40% at room temperature, taking out after 10min, and drying in a ventilated drying oven at 50 ℃ until no liquid flows on the surface, thus obtaining the honeycomb glass fiber paper block loaded with water glass.
Putting the honeycomb glass fiber paper block loaded with water glass into a sealed visual high-pressure reactor with a thermometer along the vertical direction of a honeycomb hole, introducing carbon dioxide gas from the upper part of the reactor, maintaining the pressure in the reactor to be constant at 0.1MPa by using an electromagnetic valve, and taking out the honeycomb glass fiber paper block until the temperature of the thermometer in the reactor is not changed.
The taken-out honeycomb glass fiber paper block is washed for a plurality of times by deionized water, and carbonate or bicarbonate generated by the reaction of the water glass and carbon dioxide is washed off until the sample is washed to be neutral. And (3) putting the cleaned honeycomb glass fiber paper into a sulfuric acid solution with the pH of 4.5, heating to 40 ℃ and aging for 1h, and taking out and filtering. Placing the filtered honeycomb glass fiber paper block into a muffle furnace with programmed temperature rise, preserving heat at 40 ℃ for 1h at 80 ℃ for 1h at a temperature rise rate of 2 ℃/min, preserving heat at 180 ℃ for 2h, and naturally cooling to room temperature to obtain the silica gel core material for dehumidifying the honeycomb runner.
Example 2
The pressure in the reactor was constant at 0.3MPa. Other conditions were the same as in example 1.
Example 3
The pressure in the reactor was constant at 0.5MPa. Other conditions were the same as in example 1.
Comparative example 1
The surface density was 100g/m by impregnating with an alkaline silica sol having an average particle diameter of 30nm and a concentration of 40% as a setting agent 2 Rolling the flat glass fiber paper into corrugated glass fiber paper on a hot rolling machine, and then, staggering and laminating the rolled corrugated glass fiber paper and the flat glass fiber paper together to form a honeycomb glass fiber paper block with the thickness of 85mm multiplied by 85mm.
And (3) immersing the prepared honeycomb glass fiber paper block in water glass with the modulus of 3.2 and the concentration of 40% at room temperature, taking out after 10min, and drying in a ventilated drying box at 50 ℃ until no liquid flows on the surface, thus obtaining the honeycomb glass fiber paper loaded with water glass.
And directly placing the honeycomb glass fiber paper block loaded with water glass into sulfuric acid solution with the pH value of 1 for reaction, and taking out the glass fiber paper when the pH value in the solution is not changed. Placing the filtered honeycomb glass fiber paper block into a muffle furnace with programmed temperature rise, preserving heat at 40 ℃ for 1h, preserving heat at 80 ℃ for 1h according to the temperature rise rate of 2 ℃/min, preserving heat at 180 ℃ for 2h, and naturally cooling to room temperature.
FIG. 2 is N of silica gel core materials for dehumidification of honeycomb wheels prepared in examples 1 to 3 and comparative example 1 2 Adsorption and desorption isothermal curves and pore size distribution curves. The physical parameters (specific surface area, average pore diameter, pore volume, etc.) of the prepared silica gel dry material are characterized by a BSD-PS2 specific surface area and pore diameter analyzer. As can be seen from FIG. 2, CO 2 The specific surface area and pore size distribution curve of the obtained silica gel core material for dehumidifying the honeycomb runner are different when the pressure is different, and the specific surface area and pore size distribution curve is different when the pressure is CO 2 The specific surface area of the silica gel core material for dehumidifying the honeycomb runner prepared at the pressure of 0.3MPa is the largest, and specific data are shown in Table 1.
The adsorption performance (adsorption amount) of the silica gel core material for dehumidifying honeycomb wheels prepared in examples 1 to 3 and comparative example 1 was characterized by a BSD-DVS atmospheric pressure dynamic multi-station gravimetric gas vapor adsorbent, and the results are shown in Table 1.
Physical parameters and adsorption properties of the silica gel drying materials prepared in Table 1
The results in Table 1 show that, with CO 2 Pressure change, CO 2 The concentration of the silica gel core material for dehumidifying the honeycomb rotary wheel has relatively large change of the drying physical property. Illustrating CO 2 The performance of the silica gel attached to the fiberglass paper can be adjusted. When CO 2 The silica gel core material for dehumidifying honeycomb wheels prepared had the best drying performance at a pressure of 0.3MPa, and the adsorption amounts of the silica gel drying materials at RH of 5%, 30% and 50% were 98mg/g, 158mg/g and 276mg/g, respectively, which were much higher than those of the silica gel core material prepared in comparative example 1. On the other hand, as can be seen from the weight of the honeycomb glass fiber paper in table 1, the weight of the silica gel core material for dehumidifying the honeycomb runner finally obtained by the invention is 176-190 g, and the weight of the silica gel core material obtained by the traditional method is 124g, which indicates that the silica gel coating amount of the silica gel core material is larger than that of the silica gel core material prepared by the traditional preparation method, because the silica gel easily enters into sulfuric acid solution when the traditional sulfuric acid is used for preparing the silica gel desiccant.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The preparation method of the silica gel core material for dehumidifying the honeycomb rotating wheel is characterized by comprising the following steps of:
shaping corrugated paper rolled by glass fiber paper with alkaline silica sol, and bonding the corrugated paper with flat glass fiber paper while wet to form honeycomb glass fiber paper blocks;
immersing the honeycomb glass fiber paper block in water glass, and drying to obtain a honeycomb glass fiber paper block loaded with water glass;
putting the honeycomb glass fiber paper block loaded with water glass into a closed container, and introducing CO from the top 2 Gas, CO retention 2 The pressure of the gas is 0.1-0.7 MPaWater glass and CO on a honeycomb glass fiber paper block 2 Reacting to form silicic acid, polymerizing the silicic acid, and gelatinizing to form silica gel to obtain a silica gel-loaded honeycomb glass fiber paper block;
washing the silica gel-loaded honeycomb glass fiber paper block to be neutral, and aging in an acid solution with the pH value of 4-5 to obtain an aged honeycomb glass fiber paper block;
and sequentially drying and calcining the aged honeycomb glass fiber paper block to obtain the silica gel core material for dehumidifying the honeycomb rotating wheel.
2. The method of making according to claim 1, wherein the making of the honeycomb fiberglass paper block comprises: dipping the flat glass fiber paper in alkaline silica sol, and hot rolling the glass fiber paper dipped with the alkaline silica sol to obtain corrugated glass fiber paper; and sequentially and alternately laminating the corrugated glass fiber paper and the flat glass fiber paper to obtain the honeycomb glass fiber paper block.
3. The method according to claim 2, wherein the concentration of the alkaline silica sol is 30 to 50%, and the average particle diameter of silica sol particles in the alkaline silica sol is 20 to 40nm.
4. The method according to claim 2, wherein the hot rolling temperature is 50 to 70 ℃.
5. The method according to claim 1, wherein the water glass has a concentration of 35 to 50wt% and a modulus of 2.0 to 4.0.
6. The method of claim 1 or 5, wherein the honeycomb glass fiber paper block is immersed in water glass for 3 to 15 minutes.
7. The method of claim 1, wherein the acid solution comprises a sulfuric acid solution or a hydrochloric acid solution;
the aging temperature is 40-60 ℃ and the aging time is 0.5-1.5 h.
8. The method of claim 1, wherein the sequentially drying and calcining comprises: sequentially performing first drying, first heating, second drying, second heating and calcination, wherein the temperature of the first drying is 30-50 ℃, and the heat preservation time is 0.5-1.5 h; the second drying temperature is 70-90 ℃ and the heat preservation time is 0.5-1.5 h; the calcining temperature is 160-190 ℃ and the heat preservation time is 1-3 h.
9. The method of claim 1, wherein the honeycomb fiberglass paper block is dried at a temperature of 45-60 ℃ after immersion in water glass until no liquid water glass flows on the surface of the honeycomb fiberglass paper block.
10. The method according to claim 1, wherein CO is introduced into the sealed container of the water glass-loaded honeycomb glass fiber paper block 2 The gas comprises: placing the water glass honeycomb glass fiber paper block along the vertical direction of the honeycomb holes, and carrying out CO (carbon monoxide) 2 The gas enters through the openings above the honeycomb cells.
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