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CN-121990757-A - High-strength low-heat-conductivity foam glass and preparation method thereof

CN121990757ACN 121990757 ACN121990757 ACN 121990757ACN-121990757-A

Abstract

The invention relates to the technical field of preparation of foam glass, in particular to high-strength low-heat-conductivity foam glass and a preparation method thereof; the foam glass uses waste glass and glass fiber as raw materials, silicon carbide as a foaming agent, borax as a fluxing agent, trisodium phosphate dodecahydrate as a foam stabilizer, modified polyurethane and silica aerogel are utilized to modify the foam glass, the porous structure of the aerogel has the advantages that heat is transmitted along the fine skeleton of the aerogel, the heat transmission flux is lower, the heat loss in the transmission path is larger, the solid phase transmission path of the heat in the foam glass is more complex due to the existence of aerogel particles, the low surface energy of CF 3 groups reduces the heat convection path, the solid phase heat conduction is inhibited, the foam glass has lower heat conductivity coefficient, the mechanical strength of the material is improved, and the durability and the heat preservation performance of the foam glass are enhanced.

Inventors

  • GUAN JINGUO
  • HOU XIAOLONG
  • ZHOU JIANJUN

Assignees

  • 江苏德和绝热科技有限公司

Dates

Publication Date
20260508
Application Date
20260228

Claims (8)

  1. 1. The preparation method of the foam glass with high strength and low heat conduction is characterized by comprising the following steps of: Step A1, ball milling and sieving waste glass to obtain waste glass powder; step A2, ball milling and sieving glass fibers to obtain glass fiber powder; Step A3, mixing waste glass powder, glass fiber powder, silicon carbide, borax and trisodium phosphate dodecahydrate, sieving, drying, adding into a mould for compression molding, heating for preheating, heating for foaming and sintering, cooling for annealing, and cooling to obtain foam glass; Step A4, ultrasonic cleaning is carried out on the foam glass, the ultrasonic cleaning is repeated for 2 times, and the foam glass is dried to obtain pretreated foam glass; Step A5, adding polytetramethylene glycol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate into a flask, heating, stirring and reacting, adding 2, 2-dimethylolpropionic acid and 1, 6-hexanediol into the flask, stirring and reacting, dissolving S-binaphthol into tetrahydrofuran into the flask, stirring and reacting, cooling, adding triethylamine and reacting, adding deionized water, distilling under reduced pressure, adding 3-aminopropyl trimethoxysilane into the flask, reacting, and adjusting the solid content to obtain modified aqueous polyurethane emulsion; And step A6, stirring the modified aqueous polyurethane emulsion, the trifluoropropyl methyl cyclotrisiloxane, deionized water and ethanol, adjusting the pH, heating, stirring, standing, adjusting the pH, stirring, adding the pretreated foam glass for complete infiltration, carrying out water bath reaction, aging, adding the hexamethyldisilazane solution, carrying out water bath, and drying to obtain the foam glass with high strength and low heat conduction.
  2. 2. The method for preparing foam glass with high strength and low thermal conductivity according to claim 1, wherein the waste glass in the step A1 has a composition of ：SiO 2 71.25%、Na 2 O13.77%、CaO6.37%、MgO3.98%、Al 2 O 3 2.56%、Fe 2 O 3 0.18%、K 2 O1.10%、TiO 2 0.057%、 to 0.733%.
  3. 3. The method for preparing the foam glass with high strength and low heat conductivity according to claim 1, wherein the dosage ratio of the waste glass powder, the glass fiber powder, the silicon carbide, the borax and the trisodium phosphate dodecahydrate in the step A3 is 40-80g:60-120g:2-4g:10-20g:3-6g.
  4. 4. The method for preparing high-strength low-heat-conductivity foam glass according to claim 1, wherein in the step A5, the dosage ratio of polytetramethylene glycol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, 2-dimethylolpropionic acid, 1, 6-hexanediol, N-dimethylacetamide, S-binaphthol, tetrahydrofuran, triethylamine, deionized water and 3-aminopropyl trimethoxysilane is 18.75-37.5g：5.02-10.04g：0.04-0.08g：1.01-2.02g：0.73-1.46g：10-20mL：2.195-4.39g：40-80mL：1.14-2.28g：40-80mL：3-6g.
  5. 5. The method for preparing high-strength low-thermal-conductivity foam glass according to claim 1, wherein said polytetramethylene glycol in step A5 is PTMG2000.
  6. 6. The method for preparing the foam glass with high strength and low heat conduction according to claim 1, wherein the dosage ratio of the modified aqueous polyurethane emulsion, the trifluoropropyl methyl cyclotrisiloxane, the deionized water, the ethanol, the pretreated foam glass and the hexamethyldisilazane solution in the step A6 is 1.1-2.2g:1-2mol:6-12mol:1-2mol:10-20g:20-40mL.
  7. 7. The method for preparing a high-strength low-thermal-conductivity foam glass according to claim 1, wherein the volume fraction of the hexamethyldisilazane solution in the step A6 is 15%.
  8. 8. The foam glass with high strength and low heat conduction is characterized in that the foam glass with high strength and low heat conduction is prepared by the preparation method of the foam glass with high strength and low heat conduction in any one of claims 1-7.

Description

High-strength low-heat-conductivity foam glass and preparation method thereof Technical Field The invention relates to the technical field of preparation of foam glass, in particular to high-strength low-heat-conductivity foam glass and a preparation method thereof. Background Foam glass is a porous material formed by introducing a large number of closed bubbles into a glass matrix through special processing. The glass and foam material combined with the advantages of glass and foam material has the characteristics of good dimensional stability, low water absorption, excellent fireproof performance and the like. Although foam glass has many excellent properties, there are some disadvantages in practical applications, such as higher thermal conductivity and lower mechanical strength, which limit its use in applications where reduced thermal conductivity and high strength are required. Therefore, the foam glass with high strength and low heat conduction and the preparation method thereof can not only improve the performance of materials, but also widen the application range of the foam glass in the fields of construction, electronics and industry. Disclosure of Invention In order to overcome the technical problems, the invention aims to provide the foam glass with high strength and low heat conduction and the preparation method thereof, and solve the problems of low strength and high heat conduction of the existing foam glass. The aim of the invention can be achieved by the following technical scheme: in a first aspect, the application provides a method for preparing foam glass with high strength and low heat conduction, which comprises the following steps: Step A1, adding waste glass into a ball milling tank, ball milling for 30min, and sieving with a 200-mesh screen to obtain waste glass powder, wherein the mass ratio of the ball materials is 2:1; Step A2, adding glass fibers into a ball milling tank, ball milling for 30min, and sieving with a 200-mesh screen to obtain glass fiber powder, wherein the mass ratio of the balls is 2:1; Step A3, adding waste glass powder, glass fiber powder, silicon carbide, borax and trisodium phosphate dodecahydrate into a ball milling tank, mixing for 3 hours, sieving with a 200-mesh screen, drying for 24 hours at 95 ℃ in a drying box, adding into a mould for compression molding, preheating for 30 minutes in a muffle furnace at a temperature rising rate of 5 ℃ per minute to 700 ℃, heating to 950 ℃ for foaming and sintering for 40 minutes, cooling to 600 ℃ for annealing, and cooling to obtain foam glass; Step A4, ultrasonically cleaning foam glass for 15min, repeating for 2 times, and drying in a drying oven at 60 ℃ for 6h to obtain pretreated foam glass; Step A5, adding polytetramethylene glycol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate into a three-neck flask provided with a stirrer and a reflux condenser, heating to 80 ℃ and stirring for reaction for 1h, adding 2, 2-dimethylolpropionic acid and 1, 6-hexanediol into the flask and stirring for reaction for 1.5h at 80 ℃, adding S-binaphthol into tetrahydrofuran, dripping into the flask and stirring for reaction for 3h at 80 ℃, cooling to 50 ℃, adding triethylamine for reaction for 30min, dripping deionized water, distilling under reduced pressure to remove tetrahydrofuran, adding the 3-aminopropyl trimethoxysilane into the three-neck flask provided with the thermometer and the stirrer, reacting for 2h at 75 ℃, and adjusting the solid content to 10% to obtain modified aqueous polyurethane emulsion; And A6, adding the modified aqueous polyurethane emulsion, the trifluoropropyl methyl cyclotrisiloxane, deionized water and ethanol into a beaker provided with a thermometer and a stirrer, stirring for 10min at 300r/min, adjusting the pH to 3-4 by using hydrochloric acid, heating to 55 ℃, stirring for 10min, standing for 6h, adjusting the pH to 8 by using ammonia water, stirring for 5min, adding the pretreated foam glass, fully soaking, transferring into a water bath kettle, reacting for 2-10min at 45 ℃, aging for 6h, adding a hexamethyldisilazane solution, carrying out water bath for 8h at 45-50 ℃, and drying for 24h at 50 ℃ to obtain the high-strength low-heat-conductivity foam glass. As a further scheme of the invention, the waste glass in the step A1 comprises ：SiO271.25%、Na2O13.77%、CaO6.37%、MgO3.98%、Al2O32.56%、Fe2O30.18%、K2O1.10%、TiO20.057%、 of other 0.733 percent. As a further scheme of the invention, the dosage ratio of the waste glass powder, the glass fiber powder, the silicon carbide, the borax and the trisodium phosphate dodecahydrate in the step A3 is 40-80g, 60-120g, 2-4g, 10-20g and 3-6g. As a further scheme of the invention, the dosage ratio of the polytetramethylene glycol, the dicyclohexylmethane diisocyanate, the dibutyltin dilaurate, the 2, 2-dimethylolpropionic acid, the 1, 6-hexanediol, the N, N-dimethylacetamide, the S-binaphthol, the tetrahydrofuran, the triethylamine, the deionized water and t