Environment-friendly flame-retardant glass wool board

Abstract

The invention relates to the technical field of glass wool, and provides an environment-friendly flame-retardant glass wool board which is composed of glass fibers and an inorganic binder, and the glass fibers are composed of the following components in parts by weight: 60 to 67 parts of SiO2, 12 to 15 parts of CaO, 7 to 8.5 parts of alpha-Al2O3, 3 to 5 parts of B2O3, 3 to 4 parts of Na2O, 8 to 12 parts of MgO, 0.5 to 1.5 parts of Fe2O3, 0.5 to 1 part of TiO2, 0.5 to 1 part of Bi2O3, and 0.02 to 0.05 part of SnO. According to the technical scheme, the problems of poor environmental protection property and flame retardance of the glass wool board in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of glass wool, and specifically, to an environmentally friendly flame-retardant glass wool board and a preparation method thereof. Background Art

[0002] The glass wool board is a board made of glass fiber as the main raw material, added with a binder, etc., and its fibers are intertwined to form a porous structure. In the construction field, it is commonly used for exterior wall insulation to reduce building energy consumption; in the industrial field, it is used for industrial equipment insulation to improve energy utilization efficiency; in the transportation field, it is applied inside transportation vehicles to play a role in sound insulation and heat insulation.

[0003] With the continuous enhancement of environmental protection awareness and safety awareness, people not only put forward higher requirements for the environmental protection performance of the glass wool board, but also due to the continuous increase of high-rise buildings, the rapid spread of fire, difficult rescue, large casualties and property losses during a fire, higher requirements for the flame retardancy of the glass wool board are also put forward.

[0004] Currently, in order to improve the flame retardancy of the glass wool board, a flame retardant will be selected. Compared with inorganic flame retardants, halogen-based flame retardants have better flame retardant effects, but adding halogen-based flame retardants will produce a large amount of toxic salt mist and corrosive gases during combustion, which is harmful to human health and the environment. Therefore, it is necessary to provide an environmentally friendly flame-retardant glass wool board to further ensure the safety of people's lives and property. Summary of the Invention

[0005] The present invention provides an environmentally friendly flame-retardant glass wool board and a preparation method thereof, which solve the problems of poor environmental protection and flame retardancy of the glass wool board in the related art.

[0006] The technical solution of the present invention is as follows: The present invention provides an environmentally friendly flame-retardant glass wool board, which is composed of glass fiber and an inorganic binder. The glass fiber is composed of the following components in parts by weight: SiO 2 60 - 67 parts, CaO 12 - 15 parts, α-Al 2 O 3 7 - 8.5 parts, B 2 O 3 3 - 5 parts, Na 2 O 3 - 4 parts, MgO 8 - 12 parts, Fe 2 O 3 0.5 - 1.5 parts, TiO 2 0.5 - 1 part, Bi 2 O 3 0.5 - 1 part, SnO 0.02 - 0.05 part.

[0007] As a further technical solution, the B 2 O 3 and Bi2 O 3 The weight ratio of is 3 ≤ B 2 O 3 / Bi 2 O 3 ≤ 7.

[0008] As a further technical solution, the sum of the masses of the MgO and α-Al 2 O 3 and the ratio of the sum of the masses of the B 2 O 3 and Bi 2 O 3 is 3 ≤ (MgO + α-Al 2 O 3 / (B 2 O 3 + Bi 2 O 3 ) ≤ 5.

[0009] In the present invention, the addition of components such as B 2 O 3 , Bi 2 O 3 will improve the flame retardancy of the glass fiber, but will affect the uniformity of the glass fiber, resulting in a decrease in the strength of the glass fiber. By limiting the addition amounts of MgO, α-Al 2 O 3、 B 2 O 3 , Bi 2 O 3 components, the strength of the glass fiber can be improved.

[0010] As a further technical solution, 3 ≤ B 2 O 3 / Bi 2 O 3 ≤ 7 and 3 ≤ (MgO + α-Al 2 O 3 ) / (B 2 O 3 + Bi 2 O 3 ) ≤ 5.

[0011] As a further technical solution, B 2 O 3 / Bi 2 O 3 = 6.8 and (MgO + α-Al 2 O 3 ) / (B 2 O 3 + Bi 2 O 3 ) = 3.8.

[0012] As a further technical solution, the inorganic binder is composed of silica sol, alumina, and amino silane coupling agent.

[0013] In the present invention, the silica sol not only has the characteristics of wide source, rich raw materials and low price, but also can tightly bind glass fibers together, effectively improving the overall performance of the glass wool board. However, the silica particles in the silica sol are prone to agglomeration, and the strength of the silica sol itself is limited after curing, resulting in the performance of the silica sol being affected. The addition of alumina and amino silane coupling agent can reduce the occurrence of agglomeration in the silica sol and improve the strength of the silica sol after curing.

[0014] As a further technical solution, the amino silane coupling agent includes one or more of silane coupling agent KH-550, silane coupling agent KH-602, and silane coupling agent KH792, preferably silane coupling agent KH-550.

[0015] As a further technical solution, the mass ratio of the silica sol, alumina, and amino silane coupling agent is 100:3:1.

[0016] As a further technical solution, the content of silica in the silica sol is 40wt%.

[0017] As a further technical solution, the alumina is composed of nano-scale alumina and micro-scale alumina.

[0018] In the present invention, the particle size of the nano-scale alumina is 1-100nm, preferably 30nm; the particle size of the micro-scale alumina is 1-100μm, and can be 45μm, 20μm, 10μm, preferably 20μm. By limiting the composition of the alumina, the interaction between the silica and the silica sol can be enhanced, and the strength of the silica sol can be improved.

[0019] As a further technical solution, the mass ratio of the nano-scale alumina and the micro-scale alumina is 9:1.

[0020] As a further technical solution, the preparation method of the inorganic binder includes the following steps: adding nano-scale alumina and amino silane coupling agent to the silica sol and mixing evenly, and then adding micro-scale alumina and mixing evenly again to obtain the inorganic binder.

[0021] In the present invention, adding nano-scale alumina first and then micro-scale alumina can better improve the performance of the silica sol, and the effect is better than the technical solutions of adding nano-scale alumina and micro-scale alumina simultaneously after mixing, and adding micro-scale alumina first and then nano-scale alumina.

[0022] As a further technical solution, the addition amount of the inorganic binder is 5% - 8% of the mass of the glass fiber.

[0023] The present invention also provides a preparation method of an environment-friendly flame-retardant glass wool board, comprising the following steps: S1. After mixing the glass fiber components in the above weight parts, subject them to melting and centrifugal fiber formation to obtain glass fibers; S2. Spray the inorganic binder on the glass fibers, and after curing and cutting, obtain the glass wool board.

[0024] As a further technical solution, the melting is carried out successively at temperatures of 1000°C, 1300°C, 1450°C, and 1400°C.

[0025] In the present invention, during the melting stage in the preparation process of the glass fiber, a solid-phase reaction is first carried out at 1000°C, a glass melt is formed at 1300°C, then clarification is carried out at 1450°C, and finally homogenization treatment is carried out at 1400°C, which can ensure that the produced glass fibers have high quality and more stable performance.

[0026] The working principle and beneficial effects of the present invention are as follows: In the present invention, the glass wool board does not contain substances harmful to the environment such as halogens. SiO 2 is used as the main component and serves as the basic skeleton of the glass fiber, which can provide good mechanical properties and thermal stability for the glass fiber; CaO and MgO can stabilize the structure of the glass fiber, improve the softening temperature of the glass fiber, and enable the glass fiber to maintain a certain shape and strength at high temperatures. Na 2 O, B 2 O 3 can adjust the fluidity of the glass, and further enable CaO, MgO, and B 2 O 3 , TiO 2 and others to better exert the flame-retardant performance. α-Al 2 O 3 can form a solid solution with other metal oxides, making the glass fiber not easily deformed and broken at high temperatures and preventing the spread of flames. Specific Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0028] In the following examples and comparative examples: The content of silica in the silica sol is 40 wt%; Nanoscale alumina, with a purity of 99.9% and a particle size of 30 nm; Micron-scale alumina, with a purity of 99.9% and a particle size of 20 μm.

[0029] Example 1 A preparation method of an environmentally friendly flame-retardant glass wool board, comprising the following steps: S1. Mix 60 parts of SiO 2 , 12 parts of CaO, 7 parts of α-Al 2 O 3 , 3 parts of B 2 O 3 , 3 parts of Na 2 O, 8 parts of MgO, 0.5 parts of Fe 2 O 3 , 0.5 parts of TiO 2 , 0.5 parts of Bi 2 O 3 . After solid-phase reaction at 1000 °C, form a glass melt at 1300 °C, then clarify at 1450 °C, homogenize at 1400 °C, and finally obtain glass fibers by centrifugal fiberization; S2. Mix the silica sol, nanoscale alumina, and silane coupling agent KH-550 evenly according to a mass ratio of 100:3:1 to obtain an inorganic binder; S3. Spray the inorganic binder on the glass fibers, and after curing and cutting, obtain a glass wool board; the spraying amount of the inorganic binder is 8% of the mass of the glass fibers.

[0030] Example 2 A preparation method of an environmentally friendly flame-retardant glass wool board, comprising the following steps: S1. Mix 67 parts of SiO 2 , 15 parts of CaO, 8.5 parts of α-Al 2 O 3 , 5 parts of B 2 O 3 , 4 parts of Na 2 O, 12 parts of MgO, 1.5 parts of Fe 2 O 3 , 1 part of TiO 2 , 1 part of Bi 2 O 3After mixing 1 part and 0.05 part of SnO, first carry out a solid-phase reaction at 1000 °C, then form a glass melt at 1300 °C, then carry out clarification at 1450 °C, carry out homogenization treatment at 1400 °C, and finally carry out centrifugal fiber formation to obtain glass fibers; S2. After uniformly mixing silica sol, nano-aluminum oxide, and silane coupling agent KH-550 according to a mass ratio of 100:3:1, an inorganic binder is obtained; S3. Spray the inorganic binder on the glass fibers, and after curing and cutting, a glass wool board is obtained; the spraying amount of the inorganic binder is 8% of the mass of the glass fibers.

[0031] Example 3 S1. Mix 65 parts of SiO 2 14 parts of CaO, 7.5 parts of α-Al 2 O 3 4 parts of B 2 O 3 3.5 parts of Na 2 O, 10 parts of MgO, 1 part of Fe 2 O 3 1 part of TiO 2 1 part of Bi 2 O 3 0.6 part, 0.03 part of SnO, then first carry out a solid-phase reaction at 1000 °C, then form a glass melt at 1300 °C, then carry out clarification at 1450 °C, carry out homogenization treatment at 1400 °C, and finally carry out centrifugal fiber formation to obtain glass fibers; S2. After uniformly mixing silica sol, nano-aluminum oxide, and silane coupling agent KH-550 according to a mass ratio of 100:3:1, an inorganic binder is obtained; S3. Spray the inorganic binder on the glass fibers, and after curing and cutting, a glass wool board is obtained; the spraying amount of the inorganic binder is 8% of the mass of the glass fibers.

[0032] Example 4 Compared with Example 3, the difference in this example is only that B 2 O 3 is 4.3 parts and Bi 2 O 3 is 0.3 part.

[0033] Example 5 Compared with Example 3, the difference in this example is only that B 2 O 3 is 3.6 parts and Bi 2 O 3 is 1 part.

[0034] Example 6 Compared with Example 3, the difference in this example is only that α-Al 2 O 3 is 7 parts and MgO is 9.5 parts.

[0035] Example 7 Compared with Example 3, the difference in this example is only that α-Al 2 O 3 is 8.5 parts and MgO is 10.5 parts.

[0036] Example 8 Compared with Example 3, the difference in this example is only that the nano-aluminum oxide is replaced with nano-aluminum oxide and micro-aluminum oxide with a mass ratio of 9:1.

[0037] Example 9 Compared with Example 8, the difference in this example is only the preparation method of the inorganic binder. The preparation method of the inorganic binder in this example includes the following steps: After uniformly mixing silica sol, micro-scale alumina, and silane coupling agent KH-550, nano-scale alumina is added to obtain the inorganic binder.

[0038] Example 10 Compared with Example 8, the difference in this example is only the preparation method of the inorganic binder. The preparation method of the inorganic binder in this example includes the following steps: After uniformly mixing silica sol, nano-scale alumina, and silane coupling agent KH-550, micro-scale alumina is added to obtain the inorganic binder.

[0039] Comparative Example 1 Compared with Example 1, the difference in this comparative example is only that SnO is not added.

[0040] Comparative Example 2 Compared with Example 1, the difference in this comparative example is only that Bi 2 O 3 .

[0041] Experimental Example 1 Samples were prepared according to the method for Class A1 of flat building materials and products in GB 8624-2012 "Classification of the Burning Performance of Building Materials and Products". The mass loss rate and continuous burning time of the glass wool boards in Examples 1 to 5 and Comparative Examples 1 to 2 were measured, and the measurement results are shown in Table 1 below: Table 1 Performance measurement results of the glass wool boards in Examples 1 to 5 and Comparative Examples 1 to 2

[0042] As can be seen from Table 1, the mass loss rates of the glass wool boards in Examples 1 to 5 of the present invention are all less than those in Comparative Examples 1 and 2. Therefore, the glass wool boards of the present invention have good non-combustibility.

[0043] Experimental Example 2 (1) Measure the tensile strength of the glass fibers prepared in Examples 6 to 10. The measurement method is as follows: Prepare the glass fibers in Examples 6 to 10 into specimens with a length of 200 mm. Use a sampler and specimen strip to take an unworn single fiber between the leak hole and the winding cylinder. Under a tensile rate of 8 mm / min, an ambient temperature of 23 ± 2 °C, and a humidity of 50 ± 5%, use a tensile testing machine to measure the tensile strength of the glass fibers. The measurement results are shown in Table 2.

[0044] (2) Prepare the glass wool boards in Examples 8 to 10 into specimens with dimensions of 100 mm × 100 mm × 80 mm, and measure the compressive strength with reference to the method in GB / T25975-2018 "Rock Wool Products for External Thermal Insulation of Building Exterior Walls". The measurement results are shown in Table 2.

[0045] Table 2 Performance Measurement Results of Examples 3, 6 to 10

[0046] As can be seen from Table 2, the tensile strength of the glass fibers in the present invention is 3403 - 3652 MPa, and the compressive strength of the glass wool boards is 43.7 - 51.0 kPa.

[0047] Experimental Example 3 Prepare the glass wool board in Example 1 into a specimen with dimensions of 150 mm × 100 mm × 80 mm.

[0048] (1) Measure the noise reduction coefficient of the specimen according to the method in GB / T 18696.2-2002 "Acoustics - Measurement of Sound Absorption Coefficient and Acoustic Impedance in Impedance Tubes - Part 2: Transfer Function Method".

[0049] (2) Measure the thermal conductivity of the specimen at an average temperature of 25 °C according to the method in 6.8 of GB / T 13350-2017 "Glass Wool and Its Products for Thermal Insulation".

[0050] (3) Measure the formaldehyde release amount of the specimen according to the method in GB / T 32379-2015 "Determination of Formaldehyde Release Amount of Mineral Wool and Its Products"; The measurement results are shown in Table 3.

[0051] Table 3 Performance Measurement Results of Example 1

[0052] No formaldehyde release was detected in the environmentally friendly flame-retardant glass wool board prepared by the present invention, which has very good environmental protection.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An environmentally friendly flame-retardant glass wool board, composed of glass fiber and inorganic binder, characterized in that: The glass fiber is composed of the following components in parts by weight: 60-67 parts of SiO2, 12-15 parts of CaO, 7-8.5 parts of α-Al2O3, 3-5 parts of B2O3, 3-4 parts of Na2O, 8-12 parts of MgO, 0.5-1.5 parts of Fe2O3, 0.5-1 part of TiO2, 0.5-1 part of Bi2O3, and 0.02-0.05 part of SnO.

2. The environmentally friendly flame-retardant glass wool board according to claim 1, characterized in that: The weight ratio of B2O3 and Bi2O3 is 3≤B2O3 / Bi2O3≤7.

3. The environmentally friendly flame-retardant glass wool board according to claim 1, characterized in that: The ratio of the sum of the masses of MgO and α-Al2O3 to the sum of the masses of B2O3 and Bi2O3 is 3≤(MgO+α-Al2O3) / (B2O3+Bi2O3)≤5.

4. The environmentally friendly flame-retardant glass wool board according to claim 3, characterized in that: The 3≤B2O3 / Bi2O3≤7 and 3≤(MgO+α-Al2O3) / (B2O3+Bi2O3)≤5.

5. The environmentally friendly flame-retardant glass wool board according to claim 1, characterized in that: The inorganic binder consists of silica sol, alumina and aminosilane coupling agent.

6. The environmentally friendly flame-retardant glass wool board according to claim 5, characterized in that: The aluminum oxide consists of nanometer-grade aluminum oxide and micrometer-grade aluminum oxide.

7. The environmentally friendly flame-retardant glass wool board according to claim 6, characterized in that: The preparation method of the inorganic binder comprises the following steps: adding nano-sized alumina and aminosilane coupling agent to silica sol and mixing them evenly, then adding micron-sized alumina and mixing them evenly again to obtain the inorganic binder.

8. The method for preparing an environmentally friendly flame-retardant glass wool board according to claim 1, characterized in that: The added amount of the inorganic binder is 5% to 8% of the mass of the glass fiber.

9. The method for preparing an environmentally friendly flame-retardant glass wool board according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, mixing the glass fiber components in parts by weight, and then melting and centrifuging to obtain glass fiber; S2. Spraying an inorganic binder on the glass fiber, and obtaining a glass wool board through curing and cutting.

10. The method for preparing an environmentally friendly flame-retardant glass wool board according to claim 9, characterized in that: The melting is performed at temperatures of 1000°C, 1300°C, 1450°C and 1400°C in sequence.

Images