Plant fiber reinforced soundproof hollow glass and preparation process thereof

Abstract

The application relates to the technical field of glass processing, in particular to a plant fiber reinforced sound insulation hollow glass and a preparation process thereof. The plant fiber reinforced sound insulation hollow glass comprises outer glass and a frame. The frame is fixedly connected with the outer glass on two sides. A plant fiber reinforced layer is fixedly installed in the frame. The plant fiber reinforced layer divides the frame and the two outer glass into two sealed cavities. Inert gas is filled in the two cavities. The plant fiber reinforced layer comprises a glass substrate and a plant fiber reinforced sound absorption layer. The glass substrate and the plant fiber reinforced sound absorption layer are compounded through an adhesive. The plant fiber reinforced sound insulation hollow glass and the preparation process thereof improve the sound insulation effect through “porous sound absorption + cavity blocking”, have excellent heat insulation, are more environmentally-friendly by using natural plant fibers, are stable in structure and controllable in process, and are suitable for high sound insulation requirement scenes.

Description

Technical Field

[0001] This invention relates to the field of glass processing technology, specifically to a plant fiber reinforced soundproof insulating glass and its preparation process. Background Technology

[0002] With the increasing demand for energy-saving and noise-reduction buildings, insulated glass, as a building material that combines heat insulation and sound insulation, is widely used. Existing insulated glass typically consists of two or more layers of glass separated and sealed by a spacer frame to form an air layer. Its sound insulation effect mainly relies on the buffering effect of the air layer. However, the structure of the air layer alone has limited effect on blocking low- and mid-frequency noise, making it difficult to meet the needs of scenarios with high sound insulation requirements.

[0003] Meanwhile, existing insulated glass units often use a single air layer or are filled with inert gas for the interlayer. Some products add metal mesh or plastic grilles to the interlayer to enhance structural stability, but these materials are not only dense and expensive, but may also increase sound wave reflectivity due to excessive rigidity, thus reducing sound insulation. In addition, traditional insulated glass spacers are mostly made of aluminum profiles, which, while providing some support, have poor compatibility with the glass and are prone to sealing failure due to thermal expansion and contraction over long-term use. Furthermore, existing interlayer materials, if made of organic synthetic materials, suffer from insufficient environmental friendliness and poor recyclability, which is inconsistent with the development trend of green building.

[0004] In the application of plant fibers, although some studies have explored their use in sound-absorbing materials, the weak interfacial bonding between unmodified plant fibers and the polymer matrix leads to problems such as delamination and insufficient strength in the resulting fiber mats, making them unsuitable for direct application in the load-bearing and sound-insulating composite structures of insulated glass. Furthermore, existing processes for preparing plant fiber reinforced materials suffer from insufficient fiber pretreatment and unreasonable composite molding parameters, making it difficult to precisely control key properties such as porosity and density of the fiber mats, thus affecting their sound absorption and structural stability.

[0005] Therefore, developing an insulating glass unit that combines high sound insulation performance, environmental friendliness and recyclability, structural stability and controllable manufacturing process has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention discloses a plant fiber reinforced soundproof insulating glass. The technical solution adopted is to include an outer glass layer and a frame. The outer glass layer is fixedly connected to both sides of the frame. A plant fiber reinforcement layer is fixedly installed inside the frame. The plant fiber reinforcement layer divides the frame and the two outer glass layers into two sealed cavities. Both cavities are filled with inert gas. The plant fiber reinforced layer includes a glass substrate and a plant fiber reinforced sound-absorbing layer, which are bonded together by an adhesive.

[0007] As a preferred embodiment of the present invention, the outer glass is tempered glass or semi-tempered glass.

[0008] As a preferred embodiment of the present invention, the thickness of the outer glass layer is 3-5 mm.

[0009] As a preferred embodiment of the present invention, the plant fiber reinforced sound-absorbing layer is formed by decomposing flax, ramie, or bamboo fibers into a three-dimensional mesh porous felt.

[0010] As a preferred embodiment of the present invention, the density of the plant fiber reinforced sound-absorbing layer is 80-150 kg / m³. 3 The porosity is ≥85%.

[0011] This invention also discloses a process for preparing plant fiber reinforced soundproof insulating glass, comprising the following steps: S1 fiber pretreatment: The plant fiber is immersed in 5wt% NaOH solution (80℃) for 2 hours, washed with water until neutral and dried, and then surface modified with KH-550 silane coupling agent. S2 fiber felt forming: The modified fiber obtained from S1 is mixed with water-based polyurethane adhesive at a mass ratio of 8:1, and formed into a 2-4 mm thick felt by an air-flow web forming machine. Then, it is hot-pressed and shaped at 120℃ and 0.5MPa for 10 min. Preparation of S3 composite board: The fiber felt obtained from S2 and the glass substrate are hot-pressed together at 140℃ and 0.8MPa for 15 minutes through a 0.2mm thick epoxy acrylate film to obtain the composite board; S4 Insulating Glass Assembly: The outer glass, the composite plate obtained in S3, and the spacer aluminum frame containing 3A molecular sieve desiccant are stacked together. After the edges are sealed with butyl rubber, inert gas with a purity of ≥99.9% is filled in, and then polysulfide sealant is used for secondary sealing.

[0012] As a preferred technical solution of the present invention, in step S3, the glass substrate and the fiber felt are hot-pressed together with an epoxy acrylate film to form a composite plate. When the composite plate is stacked with the outer glass and the spacer aluminum frame, the edge is sealed by a double seal of butyl rubber and polysulfide rubber.

[0013] As a preferred embodiment of the present invention, the inert gas introduced in step S4 is argon or nitrogen, and the thickness of the spacer aluminum frame is adapted to the thickness of the composite plate and the outer glass to ensure the stability of the stacked structure.

[0014] The beneficial effects of this invention are: 1. This invention achieves a synergistic effect of "porous sound absorption + cavity insulation" by setting up a composite structure of a plant fiber-reinforced sound-absorbing layer and a double-layer sealed cavity. The plant fiber-reinforced sound-absorbing layer uses a three-dimensional mesh porous felt, which can reflect sound waves multiple times and dissipate energy through its porous structure, especially improving the absorption efficiency of mid-to-low frequency noise by more than 30%. Simultaneously, the inert gas filling the double-layer sealed cavity further reduces the propagation speed of sound waves. Combined with the rigid support of the outer tempered glass, the overall sound insulation can reach more than 40dB, meeting the stringent sound insulation requirements of scenarios such as hospitals and schools.

[0015] 2. Using natural plant fibers such as flax, ramie, or bamboo fiber as the core material, compared to traditional metal or plastic reinforcement materials, the raw materials are renewable and have excellent biodegradability, reducing dependence on non-renewable resources. Simultaneously, the fiber pretreatment process uses a 5wt% NaOH solution for gentle modification, avoiding the use of highly corrosive reagents. Furthermore, the surface treatment with KH-550 silane coupling agent improves the compatibility of the fiber with water-based polyurethane adhesives, reducing volatile organic compound (VOC) emissions and meeting the environmental standards for green building materials.

[0016] 3. Achieving a strong bond of multi-layer structure through step-by-step composite process: The fiber felt is hot-pressed and shaped (120℃, 0.5MPa) to form a stable three-dimensional structure. In the composite board preparation stage, epoxy acrylate film (0.2mm) is hot-pressed and composited (140℃, 0.8MPa) to ensure that the interface bonding strength between the plant fiber reinforced sound-absorbing layer and the glass substrate (31) is ≥1.5MPa. When assembling the insulating glass, the double sealing of butyl rubber and polysulfide rubber, combined with the 3A molecular sieve desiccant in the spacer aluminum frame, can effectively block water vapor and impurities from entering the cavity, extending the service life of the product to more than 15 years. The low thermal conductivity of the inert gas also improves the overall heat insulation performance, and the heat transfer coefficient (K value) can be as low as 1.8W / (m 2 •K). Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the plant fiber reinforcement layer structure of the present invention; Figure 4 This is a schematic diagram of the preparation process of the present invention.

[0018] In the diagram: 1 Outer glass, 2 Frame, 3 Plant fiber reinforcement layer, 31 Glass substrate, 32 Plant fiber reinforced sound absorption layer. Detailed Implementation

[0019] Example 1 like Figures 1 to 3 As shown, the preparation process of a plant fiber reinforced soundproof insulating glass of the present invention is as follows: Fiber pretreatment: Flax fibers were selected and immersed in a 5wt% NaOH solution for 2 hours at 80℃. Afterward, they were repeatedly rinsed with deionized water until neutral and dried in an oven at 80℃ to constant weight. Subsequently, the dried flax fibers were placed in a 2% (w / w) KH-550 silane coupling agent ethanol solution (ethanol to water volume ratio 9:1) and stirred at 60℃ for 1 hour. Afterward, they were dried at 100℃ to complete the surface modification.

[0020] Fiber felt forming: Modified flax fibers and water-based polyurethane adhesive are mixed thoroughly in a mixer at a mass ratio of 8:1. The mixture is then fed into an air-blowing machine to form a uniform felt with a thickness of 2 mm. The felt is then placed in a hot press and hot-pressed at 120℃ and 0.5 MPa for 10 minutes to obtain flax fiber felt.

[0021] Composite board preparation: Select a glass substrate with a thickness of 3mm, lay a layer of epoxy acrylate film with a thickness of 0.2mm on its surface, then lay flax fiber felt flat on the film, put it into a hot press, and hot press it for 15min at 140℃ and 0.8MPa to obtain the composite board.

[0022] Insulating glass assembly: 3mm thick tempered glass is used as the outer layer and stacked with the aforementioned composite panel and a spacer aluminum frame containing 3A molecular sieve desiccant in the following order: outer glass, spacer aluminum frame, composite panel, spacer aluminum frame, outer glass. Butyl rubber is evenly applied to the edges of the stack for sealing. Then, 99.9% pure argon gas is injected into the two sealed cavities using a specialized gas filling device. Finally, polysulfide sealant is applied to the outside of the butyl rubber for a secondary seal, completing the assembly of the insulating glass unit.

[0023] The insulating glass prepared in this embodiment, after testing, has an overall sound insulation of 42 dB and a heat transfer coefficient (K-value) of 1.7 W / (m²). 2 •K), the density of the plant fiber reinforced sound-absorbing layer is 80 kg / m³. 3 The porosity is 86%.

[0024] Example 2 A plant fiber reinforced soundproof insulating glass, the preparation process of which is as follows: Fiber pretreatment: Ramie fibers were selected and impregnated in a 5wt% NaOH solution. The solution was treated at 80℃ for 2 hours, washed with water until neutral, and then dried in a 90℃ oven. The dried ramie fibers were then placed in a 3% (w / w) KH-550 silane coupling agent ethanol solution (ethanol to water volume ratio 8:2), stirred at 55℃ for 1.5 hours, and then dried at 110℃.

[0025] Fiber felt forming: Modified ramie fiber and water-based polyurethane adhesive are mixed evenly at a mass ratio of 8:1, and formed into a 3mm thick felt by an air-flow web forming machine. The felt is then hot-pressed at 120℃ and 0.5MPa for 10 minutes to obtain ramie fiber felt.

[0026] Composite board preparation: A 4mm thick glass substrate is used, a 0.2mm thick epoxy acrylate film is laid on it, and ramie fiber felt is placed on top. The composite board is then hot-pressed at 140℃ and 0.8MPa for 15 minutes to obtain the composite board.

[0027] Insulating glass assembly: 4mm thick semi-tempered glass is used as the outer glass layer, stacked with composite panels and spacer aluminum frames containing 3A molecular sieve desiccant. After sealing the edges with butyl rubber, nitrogen gas with a purity of 99.9% is filled in, and then polysulfide sealant is applied for a second seal.

[0028] Testing revealed that the overall sound insulation of this insulated glass unit reached 41 dB, and its heat transfer coefficient (K-value) was 1.8 W / (m²). 2 •K), plant fiber reinforced sound-absorbing layer with a density of 120kg / m³ 3 Porosity 85%.

[0029] Example 3 A plant fiber reinforced soundproof insulating glass, the preparation steps are as follows: Fiber pretreatment: Take bamboo fiber, treat it with 5wt% NaOH solution at 80℃ for 2 hours, wash it with water until neutral, and dry it at 70℃. Treat it with 1.5% KH-550 silane coupling agent ethanol solution (ethanol:water = 10:1) at 50℃ for 1.2 hours, and dry it at 90℃.

[0030] Fiber felt forming: Modified bamboo fiber and water-based polyurethane adhesive are mixed in an 8:1 ratio, and the mixture is formed into a 4mm thick felt using an air-flow web forming machine. It is then hot-pressed at 120℃ and 0.5MPa for 10 minutes to set the felt.

[0031] Composite board preparation: A 5mm glass substrate is coated with a 0.2mm epoxy acrylate film and hot-pressed with bamboo fiber felt at 140℃ and 0.8MPa for 15min to obtain a composite board.

[0032] Insulating glass assembly: 5mm tempered glass is used as the outer layer, which is stacked with composite board and spacer aluminum frame containing 3A molecular sieve. After sealing with butyl rubber, it is filled with 99.9% argon gas and then sealed with polysulfide rubber.

[0033] Test results: Overall sound insulation 43dB, heat transfer coefficient (K value) 1.6W / (m²) 2 •K), plant fiber reinforced sound-absorbing layer with a density of 150kg / m³ 3 The porosity is 87%.

[0034] Glass Performance Comparison Table

[0035] This insulated glass unit enhances sound insulation through a combination of porous sound absorption and cavity barrier (overall sound insulation of over 40dB), while also possessing excellent heat insulation properties (K-value as low as 1.6W / (m²)). 2 •K)) uses natural plant fibers, which are more environmentally friendly, have a stable structure and controllable process, and are suitable for scenarios with high sound insulation requirements.

[0036] Components not described in detail in this article are existing technologies.

[0037] While the specific embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and modifications or variations without creative effort are still within the protection scope of the present invention.

Claims

1. A plant fiber reinforced soundproof insulating glass, characterized in that, It includes an outer glass layer (1) and a frame (2). The outer glass layer (1) is fixedly connected to both sides of the frame (2). A plant fiber reinforcement layer (3) is fixedly installed inside the frame (2). The plant fiber reinforcement layer (3) divides the frame (2) and the two outer glass layers (1) into two sealed cavities, both of which are filled with inert gas. The plant fiber reinforcement layer (3) includes a glass substrate (31) and a plant fiber reinforced sound-absorbing layer (32), which are bonded together by an adhesive.

2. The plant fiber reinforced soundproof insulating glass according to claim 1, characterized in that: The outer glass (1) is tempered glass or semi-tempered glass.

3. The plant fiber reinforced soundproof insulating glass according to claim 1, characterized in that: The outer glass (1) has a thickness of 3-5 mm.

4. The plant fiber reinforced soundproof insulating glass according to claim 1, characterized in that: The plant fiber reinforced sound-absorbing layer (32) is a three-dimensional mesh porous felt formed by decomposing flax, ramie or bamboo fibers.

5. The plant fiber reinforced soundproof insulating glass according to claim 3, characterized in that: The density of the plant fiber reinforced sound-absorbing layer (32) is 80-150 kg / m³. 3 The porosity is ≥85%.

6. A manufacturing process for plant fiber reinforced soundproof insulating glass: characterized in that, Includes the following steps: S1 fiber pretreatment: The plant fiber is immersed in 5wt% NaOH solution (80℃) for 2 hours, washed with water until neutral and dried, and then surface modified with KH-550 silane coupling agent. S2 fiber felt forming: The modified fiber obtained from S1 is mixed with water-based polyurethane adhesive at a mass ratio of 8:1, and formed into a 2-4 mm thick felt by an air-flow web forming machine. Then, it is hot-pressed and shaped at 120℃ and 0.5MPa for 10 min. Preparation of S3 composite board: The fiber felt obtained from S2 and the glass substrate are hot-pressed together at 140℃ and 0.8MPa for 15 minutes through a 0.2mm thick epoxy acrylate film to obtain the composite board; S4 Insulating Glass Assembly: The outer glass, the composite plate obtained in S3, and the spacer aluminum frame containing 3A molecular sieve desiccant are stacked together. After the edges are sealed with butyl rubber, inert gas with a purity of ≥99.9% is filled in, and then polysulfide sealant is used for secondary sealing.

7. The manufacturing process of plant fiber reinforced soundproof insulating glass according to claim 6, characterized in that: In S3, the glass substrate and fiber felt are hot-pressed together with epoxy acrylate film to form a composite plate. When the composite plate is stacked with the outer glass and the spacer aluminum frame, the edge is sealed by double sealing with butyl rubber and polysulfide rubber.

8. The manufacturing process of plant fiber reinforced soundproof insulating glass according to claim 6, characterized in that: The inert gas introduced in S4 is argon or nitrogen. The thickness of the spacer aluminum frame is adapted to the thickness of the composite plate and the outer glass to ensure the stability of the stacked structure.

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