CN110791877A - Vacuum heat insulation plate with superfine glass microfiber as core material and preparation process thereof - Google Patents
Vacuum heat insulation plate with superfine glass microfiber as core material and preparation process thereof Download PDFInfo
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- CN110791877A CN110791877A CN201910878036.2A CN201910878036A CN110791877A CN 110791877 A CN110791877 A CN 110791877A CN 201910878036 A CN201910878036 A CN 201910878036A CN 110791877 A CN110791877 A CN 110791877A
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- 239000011521 glass Substances 0.000 title claims abstract description 103
- 239000011162 core material Substances 0.000 title claims abstract description 68
- 238000009413 insulation Methods 0.000 title claims abstract description 56
- 229920001410 Microfiber Polymers 0.000 title claims abstract description 51
- 239000003658 microfiber Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 51
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052810 boron oxide Inorganic materials 0.000 claims abstract description 17
- 239000003365 glass fiber Substances 0.000 claims abstract description 11
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 11
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 11
- 239000000292 calcium oxide Substances 0.000 claims abstract description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 7
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001950 potassium oxide Inorganic materials 0.000 claims abstract description 7
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001948 sodium oxide Inorganic materials 0.000 claims abstract description 7
- 239000002904 solvent Substances 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 49
- 239000000843 powder Substances 0.000 claims description 35
- 239000006060 molten glass Substances 0.000 claims description 29
- 238000001035 drying Methods 0.000 claims description 23
- 229920000742 Cotton Polymers 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000005520 cutting process Methods 0.000 claims description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 238000010309 melting process Methods 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 229910021538 borax Inorganic materials 0.000 claims description 6
- 239000010459 dolomite Substances 0.000 claims description 6
- 229910000514 dolomite Inorganic materials 0.000 claims description 6
- 239000010433 feldspar Substances 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 239000010446 mirabilite Substances 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 235000017550 sodium carbonate Nutrition 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 6
- 239000004328 sodium tetraborate Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 10
- 238000007731 hot pressing Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000156 glass melt Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N hydrochloric acid Substances Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- 238000009776 industrial production Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- MOWNZPNSYMGTMD-UHFFFAOYSA-N boron monoxide Inorganic materials O=[B] MOWNZPNSYMGTMD-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4209—Inorganic fibres
- D04H1/4218—Glass fibres
- D04H1/4226—Glass fibres characterised by the apparatus for manufacturing the glass fleece
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/04—Manufacture of glass fibres or filaments by using centrifugal force, e.g. spinning through radial orifices; Construction of the spinner cups therefor
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Glass Compositions (AREA)
Abstract
The invention discloses a vacuum insulation panel taking superfine glass microfiber as a core material, which is prepared from the following raw materials in parts by weight: silicon dioxide: 65-70 parts of a solvent; alumina: 4.5-5.0 parts; calcium oxide: 1-2 parts; magnesium oxide: 1-2 parts; potassium oxide: 0.5-1.5 parts; sodium oxide: 9-10 parts; boron oxide: 1-5 parts; according to the invention, 1-5 parts of the production components of the superfine glass microfiber containing boron oxide are used, 5-9 parts of the components of the superfine glass microfiber in the optimal forming interval of boron oxide are avoided, and the heat conductivity coefficient of the vacuum insulation panel produced by taking the glass fiber as the core material is not influenced, so that the superfine glass microfiber produced by the invention successfully bypasses the existing invention patent, the preparation process taking the superfine glass microfiber as the core material is realized, the produced dry vacuum insulation panel is not limited by the existing product patent, the production efficiency of the vacuum insulation panel is improved, and the vacuum insulation performance of the vacuum insulation panel is enhanced.
Description
Technical Field
The invention belongs to the field of glass fiber, and particularly relates to a vacuum insulation panel taking superfine glass microfiber as a core material and a preparation process thereof.
Background
With the increasingly strict requirements of the country on environmental protection and the increasing emphasis on energy resource consumption, the market demands for heat-insulating materials are increasingly vigorous, and the requirements on the heat conductivity coefficient and the heat-insulating performance of the heat-insulating materials are increasingly high.
With the decreasing of heat conductivity coefficient of heat insulating materials of refrigerators, freezers, cold chain logistics and the like, the Vacuum Insulation Panel (VIP) quickly replaces original polyurethane foam by the superior performances of low heat conductivity coefficient, smaller occupied space and the like, becomes the most superior heat insulating material on the market at present, and the VIP performance advantage of VIP taking superfine glass microfiber as a core material is more obvious. However, as the japanese VIP technology is ahead of China, the key elements in the optimal molding conditions of the ultrafine glass microfiber for manufacturing the VIP core material are as follows: 5-9 parts of the optimal forming area of B2O3, which is applied by Japanese enterprises as a patent of the company, the invention provides a method for producing the enterprise patent B without the enterprise patent based on the patent2O3The components of the superfine glass microfiber outside the interval and the superfine glass microfiber which does not influence the heat conductivity coefficient of the VIP taking the glass fiber as the core material fill the vacancy that the VIP cannot be manufactured due to patent problems in China at present.
The comparison document CN107558289A discloses a high-strength low-thermal conductivity ultrafine glass microfiber cotton dry-process hot-pressing core material and a preparation method thereof, wherein the ultrafine glass microfiber cotton dry-process hot-pressing core material comprises the following components in percentage by mass: SiO 2: 62.5-65.5 wt%, R2O: 8.5-12.5 wt%, R is Na or K, B2O 3: 5.5-8.5 wt%, CaO: 4-7.5 wt%, Al2O 3: 2.8-5.2 wt%, MgO: 1.8-4.2 wt%, Fe2O3+ ZnO + BaO: less than 0.38 wt%, and the core material has the advantages of low heat conductivity coefficient and high tensile strength and bending strength. The preparation method specifically comprises six working procedures of fiber forming, cotton collecting, rolling, cotton paving, hot pressing and slitting, continuous dynamic hot pressing is adopted in the production process of the core material, and the method has the advantages of high production efficiency, high yield, low production cost and the like.
However, in the patent, the preparation method of the superfine glass microfiber cotton dry-process hot-pressing core material still has certain defects, and the production component of the superfine glass microfiber with the content of 1-5 parts of boron oxide is not used in the preparation method, so that the production efficiency of the vacuum insulation panel is improved, and the vacuum insulation performance of the vacuum insulation panel is enhanced; the crushed raw materials are not subjected to powder selection, so that the powder selection efficiency is reduced, and the prepared VIP core material has the advantages of small average fiber diameter, poor moisture resistance and high heat conductivity coefficient; the VIP core material is not cut and stamped by cutting and stamping equipment and does not form a flat, uniform, standard size dry process core material roll felt.
Disclosure of Invention
The invention aims to solve the problems that no production component of the superfine glass microfiber with the content of 1-5 parts of boron oxide is used in the existing preparation method of the superfine glass microfiber, so that the production efficiency of the vacuum insulation panel is improved, and the vacuum insulation performance of the vacuum insulation panel is enhanced; the crushed raw materials are not subjected to powder selection, so that the powder selection efficiency is reduced, and the prepared VIP core material has the advantages of small average fiber diameter, poor moisture resistance and high heat conductivity coefficient; the technical problem that the flat, uniform and standard-sized dry-method core material rolling felt cannot be formed because the VIP core material is not cut and stamped by cutting equipment and stamping equipment, the provided vacuum insulation panel using the superfine glass microfiber as the core material and the preparation process thereof are characterized in that 1-5 parts of the production components of the superfine glass microfiber containing boron oxide are used, 5-9 parts of the components of the superfine glass microfiber in the optimal forming interval of the boron oxide are avoided, and does not affect the heat conductivity coefficient of the vacuum insulation panel produced by taking the glass fiber as the core material, so that the superfine glass microfiber produced by the invention successfully bypasses the prior invention patents, and the preparation process taking the superfine glass microfiber as the core material is realized, the produced dry-method vacuum insulation panel is not restricted by the existing product patents, the production efficiency of the vacuum insulation panel is improved, and the vacuum insulation performance of the vacuum insulation panel is enhanced; selecting the crushed raw materials by a powder selecting and grading machine, selecting powder with qualified granularity, and then pumping the powder to a specified batch homogenizing bin by a screw pump for storage, so that the powder selecting efficiency is improved, and the VIP core material prepared by the preparation method has the advantages of small average fiber diameter, good moisture resistance and low heat conductivity coefficient; the redundant side edges of the VIP core material are cut off by a side cutter of the cutting equipment, and then the VIP core material is sprayed, punched and flattened by pressing equipment, so that a flat and uniform dry-process core material coiled felt with a standard size is formed, and the industrial production of the vacuum insulation panel is realized.
The purpose of the invention can be realized by the following technical scheme:
a vacuum insulation panel taking superfine glass microfiber as a core material is prepared from the following raw materials in parts by weight: silicon dioxide: 65-70 parts of a solvent; alumina: 4.5-5.0 parts; calcium oxide: 1-2 parts; magnesium oxide: 1-2 parts; potassium oxide: 0.5-1.5 parts; sodium oxide: 9-10 parts; boron oxide: 1-5 parts;
the preparation process of the vacuum insulation panel is as follows:
step one, raw material preparation process: selecting quartz sand, soda ash, feldspar powder, dolomite, limestone, borax and mirabilite which meet the raw material proportion, processing the raw materials to the granularity of less than 40mm by a crusher, selecting the crushed raw materials by a powder selecting classifier at the rotating speed of 220 +/-20 r/min, sieving the crushed raw materials by a 20-mesh sieve, and pumping the selected powder with qualified granularity to a specified batch homogenizing bin by a screw pump for storage to obtain batch;
step two, the raw material melting process: putting the batch in a batch homogenizing bin into a melting furnace through a feeder, heating for 2-3 h within the range of 1200-1500 ℃ until bubbles in the molten glass overflow, controlling the temperature of each area of a molten pool to generate temperature difference in each area, and naturally convecting the molten glass by means of the temperature difference to obtain uniform molten glass;
standing the glass liquid in a furnace in front of the glass cotton cellar for a period of time until the temperature is reduced to 1100-1150 ℃ to obtain uniform, pure and transparent pretreated glass liquid;
step three, the glass liquid fiberization process: introducing the molten glass liquid into a centrifugal machine with the rotating speed of 1500 revolutions per minute through a leakage plate, then flowing into a centrifugal disc at the bottom of the centrifugal machine, and throwing the glass liquid out of small holes on the side wall of the centrifugal disc under the action of high-speed high-temperature gas flow in the centrifugal disc to form glass fine flow so as to fibrillate the glass liquid and obtain the superfine glass microfiber;
collecting the sprayed glass fibers onto a chain plate for cotton collection through swinging barrel equipment, and forming the collected superfine glass microfibers into a primary dry-process core material through rolling of the chain plate;
and step five, manufacturing the primary dry-process core material into a dry-process core material with a standard size through cutting equipment and stamping equipment, cutting off redundant side edges by using a side cutter to form a flat and uniform dry-process core material roll felt, and manufacturing the prepared core material into VIP (vacuum insulation panel) by using bagging equipment and vacuumizing equipment.
The aperture of the side wall small hole is about 0.6mm, the temperature of the high-speed high-temperature gas flow in the centrifugal disc is 1950-2100 ℃, and the flow rate is 550-650 m/s.
The preparation process of the superfine glass microfiber comprises the following steps:
step one, raw material preparation process: selecting quartz sand, soda ash, feldspar powder, dolomite, limestone, borax and mirabilite which meet the raw material proportion, processing the raw materials to the granularity of less than 40mm by a crusher, selecting the crushed raw materials by a powder selecting classifier at the rotating speed of 220 +/-20 r/min, sieving the crushed raw materials by a 20-mesh sieve, and pumping the selected powder with qualified granularity to a specified batch homogenizing bin by a screw pump for storage to obtain batch;
step two, the raw material melting process:
putting the batch in a batch homogenizing bin into a melting furnace through a feeder, heating for 2-3 h within the range of 1200-1500 ℃ until bubbles in the molten glass overflow, controlling the temperature of each area of a molten pool to generate temperature difference in each area, and naturally convecting the molten glass by means of the temperature difference to obtain uniform molten glass;
standing the glass liquid in a furnace in front of the glass cotton cellar for a period of time until the temperature is reduced to 1100-1150 ℃ to obtain uniform, pure and transparent pretreated glass liquid;
step three, the glass liquid fiberization process: introducing the molten glass liquid into a centrifugal machine with the rotating speed of 1500 revolutions per minute through a leakage plate, then flowing into a centrifugal disc at the bottom of the centrifugal machine, and throwing the glass liquid out of small holes on the side wall of the centrifugal disc under the action of high-speed high-temperature gas flow in the centrifugal disc to form glass fine flow so as to fibrillate the glass liquid and obtain the superfine glass microfiber;
the invention has the beneficial effects that:
1. according to the invention, 1-5 parts of the production components of the superfine glass microfiber containing boron oxide are used, 5-9 parts of the components of the superfine glass microfiber in the optimal forming interval of boron oxide are avoided, and the heat conductivity coefficient of the vacuum insulation panel produced by taking the glass fiber as the core material is not influenced, so that the superfine glass microfiber produced by the invention successfully bypasses the existing invention patent, the preparation process taking the superfine glass microfiber as the core material is realized, the produced dry vacuum insulation panel is not limited by the existing product patent, the production efficiency of the vacuum insulation panel is improved, and the vacuum insulation performance of the vacuum insulation panel is enhanced.
2. According to the preparation method, the crushed raw materials are subjected to powder selection through the powder selection classifier, powder with qualified particle size is selected, and then the powder is conveyed to the designated batch homogenizing bin through the screw pump for storage, so that the powder selection efficiency is improved, and the VIP core material prepared by the preparation method is small in average fiber diameter, good in moisture resistance and low in heat conductivity coefficient;
3. the redundant side edges of the VIP core material are cut off by a side cutter of the cutting equipment, and then the VIP core material is sprayed, punched and flattened by pressing equipment, so that a flat and uniform dry-process core material coiled felt with a standard size is formed, and the industrial production of the vacuum insulation panel is realized.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A vacuum insulation panel taking superfine glass microfiber as a core material is prepared from the following raw materials in parts by weight: silicon dioxide: 65-70 parts of a solvent; alumina: 4.5-5.0 parts; calcium oxide: 1-2 parts; magnesium oxide: 1-2 parts; potassium oxide: 0.5-1.5 parts; sodium oxide: 9-10 parts; boron oxide: 1-5 parts;
the preparation process of the vacuum insulation panel is as follows:
step one, raw material preparation process: selecting quartz sand, soda ash, feldspar powder, dolomite, limestone, borax and mirabilite which meet the raw material proportion, processing the raw materials to the granularity of less than 40mm by a crusher, selecting the crushed raw materials by a powder selecting classifier at the rotating speed of 220 +/-20 r/min, sieving the crushed raw materials by a 20-mesh sieve, and pumping the selected powder with qualified granularity to a specified batch homogenizing bin by a screw pump for storage to obtain batch;
step two, the raw material melting process:
s1: putting the batch in the batch homogenizing bin into a melting furnace through a feeder, and heating at 900-1000 ℃ for 40-60 min to obtain a non-transparent liquid of silico-hydrochloric acid and free silicon dioxide;
s2: continuously heating at 1250-1400 ℃ for 40-60 min to obtain a transparent glass liquid containing a large amount of uneven bubbles;
s3: heating for 80-120 min at 1480-1530 ℃ continuously, wherein bubbles in the molten glass overflow, the temperature of each area of the molten pool is controlled, so that temperature difference is generated in each area, and the molten glass naturally convects by means of the temperature difference to obtain uniform molten glass;
s4: when the glass liquid in the furnace in front of the glass cotton cellar is cooled to 1100-1150 ℃, uniform, pure and transparent pretreated glass liquid is obtained;
step three, the glass liquid fiberization process: introducing the molten glass liquid into a centrifugal machine with the rotating speed of 1500 revolutions per minute through a leakage plate, then flowing into a centrifugal disc at the bottom of the centrifugal machine, and throwing the glass liquid out of small holes on the side wall of the centrifugal disc under the action of high-speed and high-temperature gas flow in the centrifugal disc to obtain the superfine glass microfiber;
collecting the sprayed glass fibers onto a chain plate for cotton collection through swinging barrel equipment, and forming the collected superfine glass microfibers into a primary dry-process core material through rolling of the chain plate;
step five, manufacturing the preliminary dry-process core material into a dry-process core material with a standard size through cutting equipment and stamping equipment, cutting off redundant side edges by using a side cutter to form a flat and uniform dry-process core material roll felt, and manufacturing the prepared core material into VIP (vacuum insulation panel) by using bagging equipment and vacuumizing equipment;
wherein, the molten pool is divided into five regions, and the temperature of each region is as follows: region 1: 1480 deg.C; region 2: 1482 deg.C; region 3: 1484 ℃; region 4: 1482 deg.C; region 5: 1480 ℃.
Wherein the aperture of the side wall small hole is about 0.6mm, the temperature of the high-speed high-temperature gas flow in the centrifugal disc is 1950-2100 ℃, and the flow rate is 550-650 m/s.
The production components of the superfine glass microfiber with the content of 1-5 parts of boron oxide are used, 5-9 parts of the components of the superfine glass microfiber in the optimal forming interval of boron oxide are avoided, and the heat conductivity coefficient of a vacuum insulation panel produced by taking the glass fiber as a core material is not influenced, so that the superfine glass microfiber produced by the invention successfully bypasses the existing invention patent, the preparation process taking the superfine glass microfiber as the core material is realized, the produced dry vacuum insulation panel is not limited by the existing product patent, the production efficiency of the vacuum insulation panel is improved, and the vacuum insulation performance of the vacuum insulation panel is enhanced;
selecting the crushed raw materials by a powder selecting and grading machine, selecting powder with qualified granularity, and then pumping the powder to a specified batch homogenizing bin by a screw pump for storage, so that the powder selecting efficiency is improved, and the VIP core material prepared by the preparation method has the advantages of small average fiber diameter, good moisture resistance and low heat conductivity coefficient;
the redundant side edges of the VIP core material are cut off by a side cutter of the cutting equipment, and then the VIP core material is sprayed, punched and flattened by pressing equipment, so that a flat and uniform dry-process core material coiled felt with a standard size is formed, and the industrial production of the vacuum insulation panel is realized.
Example 1
A vacuum insulation panel taking superfine glass microfiber as a core material is prepared from the following raw materials in parts by weight: silicon dioxide: 65-70 parts of a solvent; alumina: 4.5-5.0 parts; calcium oxide: 1-2 parts; magnesium oxide: 1-2 parts; potassium oxide: 0.5-1.5 parts; sodium oxide: 9-10 parts; boron oxide: 1-5 parts;
step two, the raw material melting process:
s1: putting the batch in the batch homogenizing bin into a melting furnace through a feeder, and heating for 50min at 950 ℃ to obtain opaque liquid of silico-hydrochloric acid and free silicon dioxide;
s2: continuously heating at 1300 deg.C for 50min to obtain transparent glass liquid containing large amount of bubbles;
s3: heating at 1500 deg.C for 100min to overflow bubbles in molten glass, controlling temperature of each region of molten pool to generate temperature difference, and naturally convecting to obtain uniform molten glass;
s4: and when the glass liquid in the furnace in front of the glass cotton cellar is cooled to 1130 ℃, obtaining uniform, pure and transparent pretreated glass liquid.
Example 2
A vacuum insulation panel taking superfine glass microfiber as a core material is prepared from the following raw materials in parts by weight: silicon dioxide: 65-70 parts of a solvent; alumina: 4.5-5.0 parts; calcium oxide: 1-2 parts; magnesium oxide: 1-2 parts; potassium oxide: 0.5-1.5 parts; sodium oxide: 9-10 parts; boron oxide: 1-5 parts;
step two, the raw material melting process:
s1: putting the batch in the batch homogenizing bin into a melting furnace through a feeder, and heating for 45min at the temperature of 980 ℃ to obtain opaque liquid of silico-hydrochloric acid and free silicon dioxide;
s2: continuously heating at 1350 deg.C for 45min to obtain non-uniform transparent glass liquid containing large amount of bubbles;
s3: and continuously heating for 90min within the range of 1510 ℃, overflowing bubbles in the molten glass, controlling the temperature of each area of the molten pool to generate temperature difference in each area, and naturally convecting the molten glass by means of the temperature difference to obtain uniform molten glass.
S4: and when the glass liquid in the furnace in front of the glass cotton cellar is cooled to 1120 ℃, obtaining uniform, pure and transparent pretreated glass liquid.
Example 3
A vacuum insulation panel taking superfine glass microfiber as a core material is prepared from the following raw materials in parts by weight: silicon dioxide: 65-70 parts of a solvent; alumina: 4.5-5.0 parts; calcium oxide: 1-2 parts; magnesium oxide: 1-2 parts; potassium oxide: 0.5-1.5 parts; sodium oxide: 9-10 parts; boron oxide: 1-5 parts;
step two, the raw material melting process:
s1: putting the batch in the batch homogenizing bin into a melting furnace through a feeder, and heating at 930 ℃ for 55min to obtain opaque liquid of silico-hydrochloric acid and free silicon dioxide;
s2: continuously heating at 1380 deg.C for 55min to obtain a transparent glass liquid containing a large amount of bubbles;
s3: and continuously heating the glass melt within the range of 1490 ℃ for 110min, overflowing bubbles in the glass melt, controlling the temperature of each area of the molten pool to generate temperature difference in each area, and naturally convecting the glass melt by means of the temperature difference to obtain uniform glass melt.
S4: and when the glass liquid in the furnace in front of the glass cotton cellar is cooled to 1140 ℃, obtaining uniform, pure and transparent pretreated glass liquid.
Comparative example 1
Commercially available vacuum insulation panels.
The cold end temperature and the hot end temperature of the commercial vacuum insulation panels of examples 1 to 3 and comparative example 1 were measured by a heat flow meter, and the thermal resistance and the heat transfer coefficient of the vacuum insulation panels were measured as follows:
the average diameter of the fiber is measured by GB/T5480-2008; the water content is measured by GB/T16400-2003; the thermal conductivity was measured using GB/T10294 and the results are given in the following table:
| example 1 | Example 2 | Example 3 | Comparative example 1 | |
| Average fiber diameter/. mu.m | 5 | 6 | 7 | 1 |
| Water content% | ≦1 | ≦1 | ≦1 | ≦2.5 |
| Thermal conductivity coefficient/w/m.k | 0.037 | 0.038 | 0.041 | 0.045 |
It can be seen that the average diameter of the fibers of the vacuum insulation panels prepared in examples 1 to 3 is 3 to 8 μm; the product is weakly alkaline, the pH value is 7.5-8.0, and the product cannot cause the corrosion of copper, steel or aluminum, and has the advantages that the moisture content is kept for (96+4) h in a temperature-adjusting and humidity-regulating box with the temperature of (50+2) ° C and the relative humidity of (95+ 3)%, and the air compression ring flow; the combination of comparative example 1 shows that the superfine glass microfiber of the present invention has small average fiber diameter, high moisture resistance, low heat conductivity and excellent comprehensive performance.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. A vacuum insulation panel taking superfine glass microfiber as a core material is characterized by being prepared from the following raw materials in parts by weight: silicon dioxide: 65-70 parts of a solvent; alumina: 4.5-5.0 parts; calcium oxide: 1-2 parts; magnesium oxide: 1-2 parts; potassium oxide: 0.5-1.5 parts; sodium oxide: 9-10 parts; boron oxide: 1-5 parts;
the preparation process of the vacuum insulation panel is as follows:
step one, raw material preparation process: selecting quartz sand, soda ash, feldspar powder, dolomite, limestone, borax and mirabilite which meet the raw material proportion, processing the raw materials to the granularity of less than 40mm by a crusher, selecting the crushed raw materials by a powder selecting classifier at the rotating speed of 220 +/-20 r/min, sieving the crushed raw materials by a 20-mesh sieve, and pumping the selected powder with qualified granularity to a specified batch homogenizing bin by a screw pump for storage to obtain batch;
step two, the raw material melting process: putting the batch in a batch homogenizing bin into a melting furnace through a feeder, heating for 2-3 h within the range of 1200-1500 ℃ until bubbles in the molten glass overflow, controlling the temperature of each area of a molten pool to generate temperature difference in each area, and naturally convecting the molten glass by means of the temperature difference to obtain uniform molten glass;
standing the glass liquid in a furnace in front of the glass cotton cellar for a period of time until the temperature is reduced to 1100-1150 ℃ to obtain uniform, pure and transparent pretreated glass liquid;
step three, the glass liquid fiberization process: introducing the molten glass liquid into a centrifugal machine with the rotating speed of 1500 revolutions per minute through a leakage plate, then flowing into a centrifugal disc at the bottom of the centrifugal machine, and throwing the glass liquid out of small holes on the side wall of the centrifugal disc under the action of high-speed high-temperature gas flow in the centrifugal disc to form glass fine flow so as to fibrillate the glass liquid and obtain the superfine glass microfiber;
collecting the sprayed glass fibers onto a chain plate for cotton collection through swinging barrel equipment, and forming the collected superfine glass microfibers into a primary dry-process core material through rolling of the chain plate;
and step five, manufacturing the primary dry-process core material into a dry-process core material with a standard size through cutting equipment and stamping equipment, cutting off redundant side edges by using a side cutter to form a flat and uniform dry-process core material roll felt, and manufacturing the prepared core material into VIP (vacuum insulation panel) by using bagging equipment and vacuumizing equipment.
2. The vacuum insulation panel using microglass microfiber as core material according to claim 1, wherein the diameter of the side wall pores is about 0.6mm, the temperature of the high-speed high-temperature gas flow in the centrifugal disc is 1950-2100 ℃, and the flow rate is 550 m/s-650 m/s.
3. The vacuum insulation panel using microglass as core material according to claim 1, wherein the vacuum insulation panel is collected by spraying the glass fiber from the centrifugal disk by a chain plate rolling, and the microglass is prepared by the following steps:
step one, raw material preparation process: selecting quartz sand, soda ash, feldspar powder, dolomite, limestone, borax and mirabilite which meet the raw material proportion, processing the raw materials to the granularity of less than 40mm by a crusher, selecting the crushed raw materials by a powder selecting classifier at the rotating speed of 220 +/-20 r/min, sieving the crushed raw materials by a 20-mesh sieve, and pumping the selected powder with qualified granularity to a specified batch homogenizing bin by a screw pump for storage to obtain batch;
step two, the raw material melting process: putting the batch in a batch homogenizing bin into a melting furnace through a feeder, heating for 2-3 h within the range of 1200-1500 ℃ until bubbles in the molten glass overflow, controlling the temperature of each area of a molten pool to generate temperature difference in each area, and naturally convecting the molten glass by means of the temperature difference to obtain uniform molten glass;
standing the glass liquid in a furnace in front of the glass cotton cellar for a period of time until the temperature is reduced to 1100-1150 ℃ to obtain uniform, pure and transparent pretreated glass liquid;
step three, the glass liquid fiberization process: and introducing the molten glass liquid into a centrifugal machine with the rotating speed of 1500 revolutions per minute through a leakage plate, then flowing into a centrifugal disc at the bottom of the centrifugal machine, and throwing the glass liquid out of small holes on the side wall of the centrifugal disc under the action of high-speed high-temperature gas flow in the centrifugal disc to form glass fine flow, so that the glass liquid is fiberized to obtain the superfine glass microfiber.
4. A preparation method of a vacuum insulation panel taking superfine glass microfiber as a core material is characterized by comprising the following steps:
step one, raw material preparation process: selecting quartz sand, soda ash, feldspar powder, dolomite, limestone, borax and mirabilite which meet the raw material proportion, processing the raw materials to the granularity of less than 40mm by a crusher, selecting the crushed raw materials by a powder selecting classifier at the rotating speed of 220 +/-20 r/min, sieving the crushed raw materials by a 20-mesh sieve, and pumping the selected powder with qualified granularity to a specified batch homogenizing bin by a screw pump for storage to obtain batch;
step two, the raw material melting process: putting the batch in a batch homogenizing bin into a melting furnace through a feeder, heating for 2-3 h within the range of 1200-1500 ℃ until bubbles in the molten glass overflow, controlling the temperature of each area of a molten pool to generate temperature difference in each area, and naturally convecting the molten glass by means of the temperature difference to obtain uniform molten glass;
standing the glass liquid in a furnace in front of the glass cotton cellar for a period of time until the temperature is reduced to 1100-1150 ℃ to obtain uniform, pure and transparent pretreated glass liquid;
step three, the glass liquid fiberization process: introducing the molten glass liquid into a centrifugal machine with the rotating speed of 1500 revolutions per minute through a leakage plate, then flowing into a centrifugal disc at the bottom of the centrifugal machine, and throwing the glass liquid out of small holes on the side wall of the centrifugal disc under the action of high-speed high-temperature gas flow in the centrifugal disc to form glass fine flow so as to fibrillate the glass liquid and obtain the superfine glass microfiber;
collecting the sprayed glass fibers onto a chain plate for cotton collection through swinging barrel equipment, and forming the collected superfine glass microfibers into a primary dry-process core material through rolling of the chain plate;
and step five, manufacturing the primary dry-process core material into a dry-process core material with a standard size through cutting equipment and stamping equipment, cutting off redundant side edges by using a side cutter to form a flat and uniform dry-process core material roll felt, and manufacturing the prepared core material into VIP (vacuum insulation panel) by using bagging equipment and vacuumizing equipment.
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