Glass wool thermal insulation material and preparation process thereof
By optimizing the raw material composition and preparation process of glass wool insulation material, the strength and elastic modulus of glass fiber have been improved, solving the problem of low strength, extending service life and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-03-31
AI Technical Summary
Glass wool insulation material has low strength, which affects its service life and the durability of its insulation effect.
High-strength glass fibers are prepared by using raw materials such as waste glass, borax, quartz sand, limestone, kaolin, calcined gemstone and alumina whiskers in a specific ratio, optimizing their mass ratio and adding dolomite, and then using silica sol as a binder to prepare glass wool insulation material.
It improves the tensile strength and elastic modulus of glass fiber, extends the service life of glass wool insulation materials, and reduces production costs.
Smart Images
Figure SMS_1 
Figure SMS_2 
Figure SMS_4
Abstract
Description
Technical Field
[0001] This invention relates to the field of thermal insulation materials technology, specifically to a glass wool thermal insulation material and its preparation process. Background Technology
[0002] Glass wool insulation material, due to its low thermal conductivity, is widely used in building insulation, pipe insulation, and other fields. Its core manufacturing principle involves melting glass raw materials, spinning them into fibers, and then fixing them with an adhesive to form the final product. Since waste glass does not require mining or refining processes, its acquisition cost is lower than that of natural mineral raw materials. Therefore, using waste glass as a raw material to produce glass fibers not only reduces the production cost of glass wool insulation material but also reduces dependence on natural minerals.
[0003] Currently, the glass fiber in glass wool insulation materials has low strength, resulting in low overall strength of the glass wool insulation material. Therefore, it directly affects the service life of the glass wool insulation material and the durability of its insulation effect. Summary of the Invention
[0004] This invention proposes a glass wool insulation material and its preparation process, which solves the problem of low strength of glass wool insulation materials in related technologies.
[0005] The technical solution of the present invention is as follows: This invention proposes a glass wool insulation material, the raw materials of which include glass fiber and adhesive; the raw materials of the glass fiber include the following components in parts by weight: 100 parts waste glass, 6-8 parts borax, 4-6 parts quartz sand, 3-4 parts limestone, 4-6 parts kaolin, 4-6 parts calcined alumina, and 1-2 parts alumina whiskers; the total mass ratio of the quartz sand, kaolin, and calcined alumina to the alumina whiskers is 7.25-15.5:1.
[0006] As a further technical solution, the total mass ratio of the quartz sand, kaolin, and calcined gemstone to the mass ratio of alumina whiskers is 9~12:1, preferably 10:1.
[0007] As a further technical solution, the mass content of Al2O3 in the calcined gemstone is higher than the mass content of Al2O3 in kaolin.
[0008] As a further technical solution, the main components of the kaolin are: Al2O3 39.5wt% and SiO2 46.5wt%.
[0009] As a further technical solution, the main components of the fused gemstone are: Al2O3 46.8wt% and SiO2 51.1wt%.
[0010] As a further technical solution, the mass ratio of kaolin to pyroxene is: kaolin:pyroxene = 2~4.5:3, preferably 1:1.
[0011] Kaolin and calcite contain different amounts of Al2O3. Therefore, in the preparation of glass fibers, the amount of Al2O3 introduced by calcite is greater than that of kaolin. By further optimizing the ratio of kaolin to calcite (2~4.5:3), the amount of Al2O3 introduced can be further optimized, thereby further improving the strength of the glass fibers. In addition, it was found in the experiment that when the mass ratio of kaolin to calcite is 1:1, the strength of the glass fibers can be further improved.
[0012] As a further technical solution, the alumina whiskers have a diameter of 0.5~1μm and a length of 10μm.
[0013] As a further technical solution, the adhesive includes silica sol.
[0014] As a further technical solution, the amount of adhesive added is 6% to 8% of the mass of glass fiber.
[0015] As a further technical solution, the raw material of the glass fiber also includes 1 to 2.5 parts of dolomite, preferably 2 parts, by weight.
[0016] The addition of dolomite in this invention can further introduce calcium oxide and magnesium oxide into the glass fiber preparation process, reduce the glass viscosity during the glass fiber preparation process, improve melt quality, reduce internal defects of the fiber, and increase the elastic modulus of the glass fiber. Furthermore, by further optimizing the amount of dolomite added, the elastic modulus of the glass fiber can be further improved.
[0017] This invention also proposes a preparation process for glass wool insulation material, which includes the following steps: S1. The raw materials for glass fiber are mixed, melted, and spun into fibers to obtain glass fiber; S2. After spraying adhesive onto the glass fiber, collect the cotton and fix it into shape to obtain glass wool insulation material.
[0018] As a further technical solution, in step S1, during the fiber spinning process, the linear speed of the spinning roller is 100~130m / s, and the fiber forming distance is 1600~1700mm.
[0019] As a further technical solution, in step S1, the melting temperature is 1550~1600℃, and the melting time is 1~2h.
[0020] The working principle and beneficial effects of this invention are as follows: In this invention, waste glass is used as the base material for the glass fiber, and borax, quartz sand, soda ash, feldspar, limestone, calcined alumina, and kaolin are added as auxiliary materials to improve the strength of the glass fiber. Specifically, this invention adds quartz sand, kaolin, calcined alumina, and alumina whiskers during the glass fiber preparation process. By limiting the mass relationship between these four components, the mass content of Al2O3 in the glass fiber can be appropriately increased. An increased proportion of Al2O3 reduces the crystallization tendency of the glass fiber and improves its tensile strength. However, excessive addition will increase the melt viscosity during glass fiber preparation, which will negatively affect the tensile strength. Therefore, when the mass ratio of quartz sand, kaolin, calcined alumina, and alumina whiskers satisfies (quartz sand + kaolin + calcined alumina) / alumina whiskers = 7.25~15.5:1, the tensile strength of the glass fiber can be better improved, the service life of the glass wool insulation material can be extended, and the reuse of waste glass can be achieved. Detailed Implementation
[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0022] In the following embodiments and comparative examples: Waste glass, by mass percentage, consists of the following components: SiO2 72.2wt%, CaO 8.3wt%, Al2O3 7.5wt%, MgO 5.4wt%, K2O 3.1wt%, Na2O+K2O=0.5%, with the remainder being unavoidable impurities; Limestone: Product No. SHS13, purchased from Zibo Cunshan Mineral Products Co., Ltd.; Quartz sand: SiO299wt%; Fired gemstone: Al2O3 46.8wt%, SiO2 51.1wt%; Grade YNS45; Kaolin: Al2O3 39.5wt%, SiO2 46.5wt%; Alumina whiskers: diameter 0.5~1μm, length 10μm; Dolomite: Product No. Z6, purchased from Lingshou County Zhanxing Mineral Products Co., Ltd.; The SiO2 content in the silica sol is 30 wt%.
[0023] Example 1 A preparation process for a glass wool insulation material includes the following steps: S1. After mixing the raw materials for glass fiber, melt them at 1550℃ for 2 hours and spin them into fibers to obtain glass fiber; S2. After spraying silica sol onto the glass fiber, collect the cotton and fix it into shape to obtain glass wool insulation material; The raw materials for glass fiber include the following components by weight: 100 parts waste glass, 6 parts borax, 4 parts quartz sand, 3 parts limestone, 4 parts kaolin, 4 parts charred gemstone, and 1 part alumina whiskers; the amount of silica sol added is 6% of the glass fiber mass; during the fiber spinning process, the linear speed of the spinning roller is 100m / s, and the fiber forming distance is 1600mm. In this embodiment, the mass ratios of quartz sand, kaolin, pyroxene, and alumina whiskers satisfy the following: (quartz sand + kaolin + pyroxene): alumina whiskers = 12:1, and kaolin: pyroxene = 1:1.
[0024] Example 2 A preparation process for a glass wool insulation material includes the following steps: S1. After mixing the raw materials for glass fiber, melt them at 1600℃ for 1 hour and spin them into fibers to obtain glass fiber; S2. After spraying silica sol onto the glass fiber, collect the cotton and fix it into shape to obtain glass wool insulation material; The raw materials for glass fiber include the following components by weight: 100 parts waste glass, 7 parts borax, 5 parts quartz sand, 3.5 parts limestone, 5 parts kaolin, 5 parts charred gemstone, and 1.5 parts alumina whiskers; the amount of silica sol added is 8% of the glass fiber mass; during the fiber spinning process, the linear speed of the spinning roller is 130m / s, and the fiber forming distance is 1700mm; In this embodiment, the mass ratios of quartz sand, kaolin, pyroxene, and alumina whiskers satisfy the following: (quartz sand + kaolin + pyroxene): alumina whiskers = 10:1, and kaolin: pyroxene = 1:1.
[0025] Example 3 A preparation process for a glass wool insulation material includes the following steps: S1. After mixing the raw materials for glass fiber, melt them at 1600℃ for 1 hour and spin them into fibers to obtain glass fiber; S2. After spraying silica sol onto the glass fiber, collect the cotton and fix it into shape to obtain glass wool insulation material; The raw materials for glass fiber include the following components by weight: 100 parts waste glass, 8 parts borax, 6 parts quartz sand, 4 parts limestone, 6 parts kaolin, 6 parts charred gemstone, and 2 parts alumina whiskers; the amount of silica sol added is 8% of the glass fiber mass; during the fiber spinning process, the linear speed of the spinning roller is 130m / s, and the fiber forming distance is 1600mm. In this embodiment, the mass ratios of quartz sand, kaolin, pyroxene, and alumina whiskers satisfy the following: (quartz sand + kaolin + pyroxene): alumina whiskers = 9:1, and kaolin: pyroxene = 1:1.
[0026] Example 4 Compared with Example 2, the only difference in this example is that the raw materials of the glass fiber in this example are: 5.5 parts of quartz sand, 5 parts of kaolin, 5 parts of charcoal, and 1 part of alumina whiskers; In this embodiment, the mass ratios of quartz sand, kaolin, charcoal, and alumina whiskers satisfy the following: (quartz sand + kaolin + charcoal): alumina whiskers = 15.5:1, and kaolin: charcoal = 1:1.
[0027] Example 5 Compared with Example 2, the only difference in this example is that the raw materials of the glass fiber in this example are: 4.5 parts of quartz sand, 5 parts of kaolin, 5 parts of fused alumina, and 2 parts of alumina whiskers; In this embodiment, the mass of quartz sand, kaolin, charcoal, and alumina whiskers satisfies the following ratio: (quartz sand + kaolin + charcoal) / alumina whiskers = 7.25:1, and kaolin: charcoal = 1:1.
[0028] Example 6 Compared with Example 2, the only difference in this example is that the raw materials of the glass fiber in this example are: 5 parts of quartz sand, 4 parts of kaolin, 6 parts of charcoal, and 1.5 parts of alumina whiskers; In this embodiment, the mass ratios of quartz sand, kaolin, charcoal, and alumina whiskers satisfy the following: (quartz sand + kaolin + charcoal): alumina whiskers = 10:1, and kaolin / charcoal = 1:1.5.
[0029] Example 7 Compared with Example 2, the only difference in this example is that the raw materials of the glass fiber in this example are: 5 parts of quartz sand, 6 parts of kaolin, 4 parts of charcoal, and 1.5 parts of alumina whiskers; In this embodiment, the mass ratios of quartz sand, kaolin, charcoal, and alumina whiskers satisfy the following: (quartz sand + kaolin + charcoal): alumina whiskers = 10:1, and kaolin: charcoal = 1.5:1.
[0030] Example 8 Compared with Example 2, the only difference in this example is that, by weight, 1 part dolomite was added to the raw material of the glass fiber in this example.
[0031] Example 9 Compared with Example 2, the only difference in this example is that, by weight, 2 parts of dolomite were added to the raw material of the glass fiber in this example.
[0032] Example 10 Compared with Example 2, the only difference in this example is that, by weight, 2.5 parts of dolomite were added to the raw material of the glass fiber in this example.
[0033] Comparative Example 1 Compared with Example 1, the only difference in this comparative example is that the raw material of the glass fiber does not contain alumina whiskers.
[0034] Comparative Example 2 Compared with Example 1, the only difference in this comparative example is that the calcined sapphire in the glass fiber raw material is replaced with an equal amount of kaolin.
[0035] Comparative Example 3 Compared with Example 1, the only difference in this comparative example is that kaolin is replaced with an equal amount of calcined sapphire in the raw materials of glass fiber.
[0036] Experimental Example 1 The tensile strength of the glass fibers in Examples 1-7 and Comparative Examples 1-3 was determined using the following methods: Glass fiber raw materials were used to obtain glass fiber monofilaments with a diameter of 12 μm through a single-hole drawing crucible. The tensile strength of a single glass fiber was then measured immediately through a micro-stress tensile tester. Fifty glass fibers were measured and the average value was taken. The test environment was 20±1.0℃ and 45±5% humidity. The test results are shown in Table 1.
[0037] Table 1. Performance test results of glass fiber
[0038] As shown in Table 1, the tensile strength of the glass fibers in Examples 1-7 of the present invention is higher than that in Comparative Examples 1-3, indicating that the addition of quartz sand, calcined gemstone, kaolin, and alumina whiskers to the raw materials of the glass fibers of the present invention improves the tensile strength of the glass fibers.
[0039] Experiment Example 2 According to ASTM D2343 standard, the elastic modulus of glass fibers in Examples 2 and 8-10 was determined using a universal electronic testing machine. The results are shown in Table 2 below.
[0040] Table 2. Performance test results of glass fiber
[0041] As shown in Table 2, the elastic modulus of the glass fibers in Examples 8 to 10 of this invention is higher than that in Example 2, indicating that the addition of dolomite to the raw materials of the glass fibers of this invention improves the elastic modulus of the glass fibers.
[0042] Experimental Example 3 The glass wool insulation materials from Examples 1 and 2 were prepared into samples of 200mm × 600mm × 10mm, according to GB / T25975. The compressive strength and thermal conductivity of the samples were determined using the method described in 2018 "Rock Wool Products for External Thermal Insulation of Buildings". The results are shown in Table 3.
[0043] Table 3 Performance test results of glass wool insulation materials
[0044] As shown in Table 3, the compressive strength of the glass wool insulation material in Examples 1-2 of the present invention is ≥45.5kPa and the thermal conductivity is ≤0.035 W / (m•K).
[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A glass wool insulation material, characterized in that, The raw materials of the glass wool insulation material include glass fiber and adhesive; the raw materials of the glass fiber include the following components in parts by weight: 100 parts waste glass, 6-8 parts borax, 4-6 parts quartz sand, 3-4 parts limestone, 4-6 parts kaolin, 4-6 parts calcined alumina, and 1-2 parts alumina whiskers; the total mass ratio of the quartz sand, kaolin, and calcined alumina to the alumina whiskers is 7.25-15.5:
1.
2. The glass wool insulation material according to claim 1, characterized in that, The total mass ratio of the quartz sand, kaolin, and calcined gemstone to the mass ratio of the alumina whiskers is 9~12:
1.
3. The glass wool insulation material according to claim 1, characterized in that, The mass ratio of kaolin to pyroxene is: kaolin:pyroxene = 2~4.5:
3.
4. The glass wool insulation material according to claim 1, characterized in that, The alumina whiskers have a diameter of 0.5~1μm and a length of 10μm.
5. The glass wool insulation material according to claim 1, characterized in that, The adhesive includes silica sol.
6. The glass wool insulation material according to claim 1, characterized in that, The amount of adhesive added is 6% to 8% of the mass of the glass fiber.
7. The glass wool insulation material according to claim 1, characterized in that, The raw materials for the glass fiber also include 1 to 2.5 parts of dolomite by weight.
8. A preparation process for a glass wool insulation material, used to prepare a glass wool insulation material as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. The raw materials for glass fiber are mixed, melted, and spun into fibers to obtain glass fiber; S2. After spraying adhesive onto the glass fiber, collect the cotton and fix it into shape to obtain glass wool insulation material.
9. The preparation process of a glass wool insulation material according to claim 8, characterized in that, In step S1, during the fiber spinning process, the linear speed of the spinning roller is 100~130m / s, and the fiber spinning distance is 1600~1700mm.
10. The preparation process of a glass wool insulation material according to claim 8, characterized in that, In step S1, the melting temperature is 1550~1600℃, and the melting time is 1~2h.