A method for combining fiberglass and sponge

Abstract

The application provides a composite method of glass fiber and sponge, and belongs to the technical field of composite materials. A layer of electronic-grade glass fiber cloth and a layer of polyurethane sponge are compounded by ceramicized silicone rubber liquid to obtain a glass fiber and sponge composite cloth; two glass fiber and sponge composite cloths prepared in step A are compounded by ceramicized silicone rubber liquid with the sponge side as the composite surface to obtain a glass fiber and sponge composite multilayer with electronic-grade glass fiber cloth on the outer side; the glue coating operation before the compounding between the electronic-grade glass fiber cloth and the polyurethane sponge is completed by a negative pressure impregnation structure, the negative pressure impregnation composite structure comprises a glue tank located on the lower side of the polyurethane sponge layer and a wind cover located on the upper side of the polyurethane sponge layer, a plurality of cloth guide rollers are arranged at the lower opening of the wind cover, gaps are formed between adjacent cloth guide rollers, the upper part of the wind cover is connected with a negative pressure air source, a plurality of glue coating rollers are arranged at the upper opening of the glue tank, and the glue coating rollers are partially located below the liquid level in the glue tank. The application has the advantages of high peel strength and the like.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology and relates to a composite method of fiberglass sandwiched with sponge. Background Technology

[0002] With the development of the new energy vehicle and energy storage industries, the safety of power batteries and energy storage batteries has become an increasingly important focus. Due to the inherent chemical activity and instability of lithium-ion batteries, lithium-ion power / energy storage batteries are highly susceptible to thermal runaway and even fire / deflagration / explosion accidents during storage and operation due to impacts, punctures, external force-induced shocks, or simply their inherent chemical instability. When a lithium-ion battery catches fire, the fire spreads extremely rapidly, leaving very little time for the energy storage power station to extinguish it; often, the fire can only be put out after it has completely burned out. Similarly, compared to the spontaneous combustion of gasoline vehicles, the escape time for passengers in the event of a fire in a new energy vehicle equipped with lithium-ion power batteries is extremely short, posing a significant danger to passengers. Therefore, with the development of the new energy vehicle and energy storage industries, solving the resulting thermal runaway and fire prevention problems has always been a key issue that needs to be addressed.

[0003] Given the excellent flame-retardant and fire-resistant properties of silicone rubber, as well as its extremely low price and high strength compared to aerogel materials (which have both excellent heat insulation and fire resistance, but extremely low strength and extremely high price), utilizing the excellent fire-resistant properties of silicone materials and endowing them with excellent heat insulation properties to achieve excellent heat insulation and fire resistance while being economical is a highly promising way to solve the problem of thermal runaway fire prevention in lithium-ion batteries.

[0004] By adding a ceramicized flame retardant to silicone rubber, a ceramic layer is formed through its ceramicization properties when exposed to high-temperature flames. The resulting glass fiber sponge composite material, made by adding the above-mentioned ceramic silicone to the composite position of sponge and glass fiber for bonding, has good heat insulation and flame retardant properties. Currently, most composite methods adopt the traditional coating and rolling method. This method is difficult to adapt to the porous structure of sponge, so that the ceramic silicone liquid can be evenly penetrated into the pores of the sponge to enhance the bonding strength and improve the heat insulation performance (the ceramic silicone material fills and seals the open-cell pores of the polyurethane sponge layer). Therefore, based on the porous and irregular pore structure of sponge, it is necessary to design a composite method that is adapted to optimize the properties of the composite material. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by providing a composite method for fiberglass reinforced with sponge. The technical problem this invention aims to solve is how to improve the peel strength of the composite material.

[0006] The objective of this invention can be achieved through the following technical solution: A composite method for fiberglass-coated sponge, characterized by the following steps: A) First, a layer of electronic-grade fiberglass cloth and a layer of polyurethane sponge are composited using a ceramicized silicone rubber liquid to obtain a fiberglass-coated sponge composite cloth; B) The fiberglass-coated sponge cloths obtained in both steps A are composited with the sponge side as the composite surface using a ceramicized silicone rubber liquid to obtain two multi-layer fiberglass-coated sponge composite cloths with electronic-grade fiberglass cloth on both outer sides; In step A, the adhesive coating operation before the electronic-grade fiberglass cloth and polyurethane sponge are composited is completed by a negative pressure impregnation structure. The negative pressure impregnation composite structure includes an adhesive tank located below the polyurethane sponge layer and an air hood located above the polyurethane sponge layer. Several guide rollers are provided at the lower opening of the air hood, and there is a gap between adjacent guide rollers. The upper part of the air hood contracts to form an exhaust pipe, which is connected to a negative pressure air source. Several coating rollers are provided at the upper opening of the adhesive tank, and the coating rollers are partially located below the liquid surface in the adhesive tank.

[0007] Furthermore, before the polyurethane foam enters the negative pressure impregnation structure, the electronic-grade fiberglass cloth and the polyurethane foam are clamped by two pressure rollers. After the polyurethane foam leaves the negative pressure impregnation structure, the electronic-grade fiberglass cloth and the polyurethane foam are pressed and bonded together by two pressure rollers.

[0008] Furthermore, the polyurethane foam is a flame-retardant foam with a high closed-cell rate and an air permeability of 30L / m². 2 / s~150L / m 2 / s.

[0009] Furthermore, the electronic-grade fiberglass cloth and polyurethane sponge are heat-dried after lamination, and then naturally cooled after heat drying.

[0010] Furthermore, after the two layers of fiberglass sponge cloth are coated and laminated, they are naturally cooled by a guide frame and then wound up.

[0011] This solution utilizes the breathability of polyurethane foam, applying adhesive in small, repeated roller coatings to the composite surface of the foam. After each coating, under negative pressure, the adhesive penetrates into the pores of the broken foam cells. After multiple coatings and adhesive penetration, a bonding layer is formed on the composite surface of the foam. This bonding layer is formed after the foam is infiltrated with adhesive. The adhesive cures and seals the pores, forming a ceramic insulation layer. The final product is a seven-layer structure, consisting of, from one side to the other, an electronic-grade fiberglass cloth layer, an adhesive-infiltrated foam layer, a polyurethane foam layer, another adhesive-infiltrated foam layer, another polyurethane foam layer, another adhesive-infiltrated foam layer, and finally an electronic-grade fiberglass cloth layer. To prevent cracking of the ceramic layer caused by slight expansion during high-temperature flame exposure, which could damage the thermal insulation and fire resistance of the ceramicized silicone rubber, electronic-grade fiberglass cloth layers are applied to the outer surfaces. The ceramicized silicone rubber infiltrating into the foam cells forms an adhesive-impregnated sponge layer that seals the pores, making it more resistant to expansion, retains its shape, and is denser. The negative pressure and roller pressing after lamination not only allow the adhesive to penetrate the sponge and fill the pores, but also effectively eliminate air bubbles formed during the adhesive filling process. The thermal insulation performance is enhanced by the presence of multiple adhesive-impregnated sponge layers and the alternating arrangement of multiple low-permeability polyurethane sponge layers. Hot airflow is difficult to pass through the polyurethane sponge layer due to the low permeability. Combined with the thermal insulation and fireproof properties of the ceramic material itself, the entire composite material is improved in terms of temperature resistance, fireproofing, and thermal insulation. The presence of the adhesive-impregnated sponge layer facilitates the transition between different materials and enhances mechanical properties. After the adhesive penetrates the sponge, it can significantly improve the bonding strength between sponges and between sponges and fiberglass cloth, resulting in high peel strength. It is equivalent to using the sponge to form a rough bonding surface and a storage bonding surface for the adhesive in the mesh structure. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the composite structure of fiberglass-reinforced sponge.

[0013] Figure 2 This is a schematic diagram of a negative pressure impregnation structure.

[0014] Figure 3 This is a schematic diagram of the layered structure of the seven-layer composite material.

[0015] In the diagram, 1. Negative pressure impregnation structure; 2. Glue tank; 3. Air hood; 4. Guide roller; 5. Glue coating roller; 6. Pressure roller one; 7. Pressure roller two; a. Electronic grade fiberglass cloth layer; b. Glue-impregnated sponge layer; c. Polyurethane sponge layer. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] Preparation of ceramicized silicone rubber compound

[0018] Weigh out the following components in Component A at a ratio of 3:7: 10000 mPa·S / 25℃ viscosity vinyl polysiloxane (VS10000 from Anbiya Specialty Silicones (Nantong) Co., Ltd.) and 750000 mPa·S / 25℃ viscosity base adhesive (6345 base adhesive from Dongguan Chuanshi Electronic Technology Co., Ltd.). Weigh out the following flame retardant (CFR-2 flame retardant from Anhui Yishitong Materials Technology Co., Ltd.) at a ratio of 1.2:1 to the sum of the flame retardant and the vinyl polysiloxane and base adhesive. The crosslinking agent (side-chain hydrogen-containing silicone oil H=1.6 from Jiande Juhe New Materials Co., Ltd.) with a hydrogen content of 16 mmol / g was weighed out at an addition ratio of 0.0054:1 to the sum of the crosslinking agent, vinyl polysiloxane, and base adhesive. The catalyst (PT-5000 from Zhongshan Zijun Chemical Co., Ltd.) and the inhibitor (OS121 from Shenzhen Ousbang New Materials Co., Ltd.) were weighed out at an addition ratio of 0.005:1 to the sum of the catalyst, vinyl polysiloxane, and base adhesive. Weigh out the vinyl polysiloxane (VS10000 from Anbiy Specialty Silicones (Nantong) Co., Ltd.) with a viscosity of 10000 mPa·S / 25℃ and the base adhesive (6345 base adhesive from Dongguan Chuanshi Electronic Technology Co., Ltd.) with a viscosity of 750000 mPa·S / 25℃ in a ratio of 3:7. Weigh out the flame retardant (CFR-2 flame retardant from Anhui Yishitong Materials Technology Co., Ltd.) with a ratio of 1.2:1 to the sum of the flame retardant and the vinyl polysiloxane and the base adhesive. Weigh out the crosslinking agent (side-chain hydrogen-containing silicone oil H=1.6 from Jiande Juhe New Materials Co., Ltd.) with a hydrogen content of 16 mmol / g in a ratio of 0.0054:1 to the sum of the crosslinking agent and the vinyl polysiloxane and the base adhesive. Subsequently, components A and B were stirred separately using a double planetary mixer at a speed of 100 RPM and a double-layer dispersion disc speed of 3000 RPM. While stirring, a vacuum was drawn to -100 kPa, and the mixture was simultaneously cooled by a circulating water cooler to control the material temperature of components A and B to be below 20°C. After stirring for 20 minutes, components A and B of the ceramicized silicone rubber compound were obtained.

[0019] Preparation of fiberglass-fiberglass-sponge composite thermal insulation and fireproof material

[0020] After the prepared ceramicized silicone rubber compound components A and B are mixed evenly, they are continuously and quantitatively injected into the glue tank. Figure 1 and Figure 2As shown, after the electronic-grade fiberglass cloth and the 2.2mm thick KZ314FM-70PPI polyurethane sponge produced by our company are clamped by the pressure roller 6, the electronic-grade fiberglass cloth is separated from the sponge to avoid the glue groove 2. The sponge passes between the glue groove 2 and the air cover 3 and is supported and guided by the guide roller 4 and the glue coating roller 5. The negative pressure inside the air cover 3 is controlled at about 50Mpa. By continuously applying glue to the sponge and using negative pressure to penetrate the glue, the glue can penetrate into the sponge with a certain thickness and the cloth penetrates the high closed-cell sponge layer. After the glue penetration is completed, the pressure roller 7 clamps the sponge and the fiberglass cloth to flatten them. Then, it is heated and cured in a forced-air drying oven at 110-130℃ for 5 minutes to obtain a semi-finished product of double-layer fiberglass sponge composite. Two naturally cooled semi-finished products were mixed with components A and B of a ceramicized silicone rubber compound and coated onto the smooth surface of a polyurethane sponge. The mixture was then calendered using a two-roll calender and placed in a forced-air drying oven at 110–130°C for 5 minutes to obtain a 5mm thick finished product. The final product is a shape resembling... Figure 3 The seven-layer structure shown, from one side to the other, consists of electronic-grade fiberglass cloth layer a, glue-impregnated sponge layer b, polyurethane sponge layer c, glue-impregnated sponge layer b, polyurethane sponge layer c, glue-impregnated sponge layer b, and electronic-grade fiberglass cloth layer a.

[0021] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A composite method for fiberglass reinforced with sponge, characterized in that, The process includes the following steps: A) First, a layer of electronic-grade fiberglass cloth and a layer of polyurethane sponge are composited using a ceramicized silicone rubber liquid to obtain a fiberglass sponge composite cloth; B) The fiberglass sponge cloths obtained in step A are then composited with the sponge side as the composite surface using a ceramicized silicone rubber liquid to obtain two fiberglass-sponge composite multilayers with electronic-grade fiberglass cloth on both outer sides. The final fiberglass-sponge composite multilayer has a seven-layer structure, consisting of, from one side to the other, an electronic-grade fiberglass cloth layer (a), a glue-impregnated sponge layer (b), a polyurethane sponge layer (c), a glue-impregnated sponge layer (b), a polyurethane sponge layer (c), a glue-impregnated sponge layer (b), and an electronic-grade fiberglass cloth layer (a). The ceramicized silicone rubber penetrates into the sponge pores to seal the foam. The pores form the glue-impregnated sponge layer (b); in step A, the glue coating operation before the electronic grade glass fiber cloth and polyurethane sponge are combined is completed by a negative pressure impregnation structure (1). The negative pressure impregnation composite structure includes a glue tank (2) located on the lower side of the polyurethane sponge layer and a wind hood (3) located on the upper side of the polyurethane sponge layer. Several guide rollers (4) are provided at the lower opening of the wind hood (3). There is a gap between adjacent guide rollers (4). The upper part of the wind hood (3) shrinks to form an exhaust pipe. The exhaust pipe is connected to a negative pressure air source. Several glue-coating rollers (5) are provided at the upper opening of the glue tank (2). The glue-coating rollers (5) are partially located below the liquid surface in the glue tank (2).

2. The composite method of fiberglass reinforced sponge according to claim 1, characterized in that, Before entering the negative pressure impregnation structure (1), the electronic grade glass fiber cloth and the polyurethane sponge are clamped by two pressure rollers (6). After the polyurethane sponge leaves the negative pressure impregnation structure (1), the electronic grade glass fiber cloth and the polyurethane sponge are pressed and bonded together by two pressure rollers (7).

3. The composite method of fiberglass reinforced sponge according to claim 1, characterized in that, The polyurethane foam is a flame-retardant foam with a high closed-cell ratio and an air permeability of 30L / m². 2 / s~150L / m 2 / s.

4. The composite method of fiberglass reinforced sponge according to claim 1, characterized in that, Electronic-grade fiberglass cloth and polyurethane foam are heat-dried after lamination, and then naturally cooled after heat drying.

5. The composite method of fiberglass reinforced sponge according to claim 1, characterized in that, After the two layers of fiberglass sponge cloth are coated and laminated, they are naturally cooled by a guide frame and then wound up.

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