Rubber sealing strip for composite material and preparation method of rubber sealing strip

Abstract

The invention relates to the technical field of polymer products, in particular to a rubber sealing strip for a composite material and a preparation method of the rubber sealing strip. The silicone rubber composition comprises the following components in parts by weight: 50-70 parts of phenyl silicone rubber, 10-25 parts of boron silicone rubber, 10-20 parts of fluorinated silicone rubber, 5-10 parts of fluoroether rubber, 5-10 parts of a high-temperature modifier, 10-30 parts of white carbon black, 10-30 parts of aramid short fibers, 5-10 parts of a structure regulator, 5-15 parts of a coupling agent, 0.5-5 parts of an accelerant, 1.0-3.0 parts of a vulcanizing agent, 1-2 parts of zinc stearate and 1-3 parts of an anti-aging agent. Phenyl siloxane rubber, boron silicone rubber, fluorinated silicone rubber and fluoroether rubber are associated with one another through a high-temperature modifier to improve the high-temperature resistance of the material, and then the high-temperature resistance and tear resistance of the crosslinked rubber sealing strip are improved by utilizing the interaction of a rubber matrix with aramid short fibers, a structure modifier, a coupling agent and white carbon black, so that the service life of the sealing strip is prolonged, and the service life of the sealing strip is prolonged. Meanwhile, the compression set and the thermal expansion ratio of the rubber are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of polymer products, in particular to a rubber sealing strip for composite materials and a preparation method thereof. Background Art

[0002] Composite materials are a general term for materials with distinct interfacial interactions, created through precise design using advanced materials preparation techniques to combine two or more different physical and chemical components. Composite materials leverage the complementary and interdependent nature of two or more materials to achieve comprehensive properties unattainable by a single material. They are widely used in a wide range of industries, including automotive, construction, aviation, aerospace, marine, and rail vehicles.

[0003] However, composite materials usually require a high-temperature sealing environment during the molding process. The rubber sealing strips prepared by existing technologies do not meet the use requirements of composite materials in terms of thermal expansion ratio, high-temperature resistance, compression permanent deformation and mechanical properties, which seriously affects the quality stability of composite material preparation.

[0004] The invention patent with application publication number CN105175806A provides "a high-temperature resistant and anti-aging rubber sealing strip material for vehicles and its preparation method". The preparation of the rubber sealing strip mainly involves mixing natural rubber, EPDM rubber, ethylene-butylene elastomer, antioxidant BLE, jojoba oil, triethoxysilane, dibutyl phthalate, di-n-butyl thiodiglycolate, triethanolamine, stearic acid, accelerator DPTT, zinc oxide, nano-antimony tin oxide, epoxy soybean oil, cordierite powder, sulfur, calcined loess and other raw materials, and preparing the sealing strip through vulcanization. The EPDM rubber used in this invention itself has excellent sealing effect, very good aging resistance and good weather resistance. The added ethylene-butylene elastomer improves the overall impact elasticity of the rubber material; the added antioxidant BLE and nano-antimony tin oxide enhance the aging resistance of the rubber; the reasonable combination of other additives improves the heat resistance, wear resistance and elasticity of the rubber, and brings into play the good compression deformation resistance and sealing performance of the rubber material, making it safer.

[0005] Patent application publication number CN108285583A relates to a "high-temperature-resistant and anti-aging rubber sealing strip material for vehicles." The invention's components are composed by weight of: 40-50% natural rubber, 0.1-1% ethylene-butylene elastomer, 0.1-3% jojoba oil, 0.1-3% azodicarbonamide, 0.1-3% triethoxysilane (chloropropyl)silane, and 40-60% EPDM rubber. The rubber sealing strip produced by this invention is heat-resistant, wear-resistant, and has excellent sealing properties.

[0006] Patent application publication number CN107474541A discloses an automotive rubber sealing strip, which belongs to the field of automotive parts technology. The strip is made from the following raw materials by weight: 45-60 parts silicone rubber, 20-30 parts EPDM rubber, 5-20 parts reinforcing agent, 3-5 parts tripropylene isocyanurate, 5-6 parts activated zinc oxide, 1-2 parts stearic acid, 2-3 parts vulcanizing agent, 2-3 parts antioxidant, 0.5-1 part accelerator, 1-1.5 parts plasticizer, and 1-2 parts antioxidant. This invention addresses the issue of poor heat resistance in automotive rubber sealing strips.

[0007] Existing technical solutions all use silicone rubber, EPDM rubber, natural rubber, and ethylene-butylene elastomer as base rubber, adding high-temperature modification additives such as nano-tin antimony oxide, cordierite powder, calcined loess, and amorphous mineral fiber. The resulting rubber sealing strips are then produced through mixing and vulcanization. These existing technologies remain limited to traditional rubber processing and modification, without comprehensively designing a formula to optimize the high-temperature and tear resistance properties of the rubber sealing strips. Furthermore, they fail to address key mold sealing requirements during composite material production, such as the rubber's compression set and thermal expansion ratio. Summary of the Invention

[0008] In view of the defects of the prior art, the present invention provides a rubber sealing strip for composite materials and a preparation method thereof. The method first associates phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber with each other through a high-temperature modifier to form a high-temperature resistant aggregate, thereby improving the high-temperature resistance of the material. Then, the interaction between the rubber matrix and aramid staple fibers, structural regulators, coupling agents and white carbon black is utilized to greatly improve the high-temperature resistance and tear resistance of the cross-linked rubber sealing strip, while reducing the compression permanent deformation and thermal expansion ratio of the rubber.

[0009] In order to achieve the above-mentioned purpose, on the one hand, the technical solution provided by the present invention is a rubber sealing strip for composite materials, whose components, in parts by weight, include: 50-70 parts of phenyl silicone rubber, 10-25 parts of borosilicate rubber, 10-20 parts of fluorosilicone rubber, 5-10 parts of fluoroether rubber, 5-10 parts of high-temperature modifier, 10-30 parts of white carbon black, 10-30 parts of aramid staple fiber, 5-10 parts of structure regulator, 5-15 parts of coupling agent, 0.5-5 parts of accelerator, 1.0-3.0 parts of vulcanizing agent, 1-2 parts of zinc stearate and 1-3 parts of antioxidant.

[0010] Preferably, the weight proportion of the phenyl silicone rubber is 50-70 parts, for example, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0011] Preferably, the weight proportion of the borosilicate rubber is 10-25 parts, for example, 10 parts, 15 parts, 20 parts, 25 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0012] Preferably, the weight proportion of the fluorosilicone rubber is 10-20 parts, for example, 10 parts, 15 parts, 20 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0013] Preferably, the weight proportion of the fluoroether rubber is 5-10 parts, for example, 5 parts, 8 parts, 10 parts, and specific values ​​between the above values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific values ​​included in the range.

[0014] Preferably, the weight portion of the high temperature modifier is 5-10 parts, for example, 5 parts, 8 parts, 10 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0015] Preferably, the weight proportion of the silica is 10-30 parts, for example, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0016] Preferably, the weight proportion of the aramid staple fiber is 10-30 parts, for example, it can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0017] Preferably, the weight portion of the structure regulator is 5-10 parts, for example, it can be 5 parts, 7 parts, 9 parts, 10 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0018] Preferably, the weight portion of the coupling agent is 5-15 parts, for example, 5 parts, 10 parts, 15 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0019] Preferably, the weight portion of the promoter is 0.5-5 parts, for example, it can be 0.5 parts, 1.0 parts, 1.5 parts, 2.0 parts, 2.5 parts, 3.0 parts, 3.5 parts, 4.0 parts, 4.5 parts, 5.0 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0020] Preferably, the weight portion of the vulcanizing agent is 1.0-3.0 parts, for example, 1.0 parts, 2.0 parts, 3.0 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0021] Preferably, the weight portion of the zinc stearate is 1-2 parts, for example, 1 part, 1.5 parts, 2 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0022] Preferably, the weight portion of the antioxidant is 1-3 parts, for example, it can be 1 part, 2 parts, 3 parts, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0023] As a preferred technical solution of the present invention, the phenyl silicone rubber used in the present invention is a high molecular weight linear polysiloxane containing phenylsiloxane or methylphenylsiloxane segments in the main chain; Preferably, the phenyl silicone rubber is any one of JC-200 (phenyl content 5%-15%), JC-300 (phenyl content 15%-25%), JC-350 (phenyl content 25-35%), and JC-400 (phenyl content 40%), or a combination of at least two thereof; Preferably, the phenyl content in the phenyl silicone rubber is 5%-40%, for example, 5%, 15%, 25%, 35%, 40%, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention will no longer exhaustively list the specific values ​​included in the range. As a preferred technical solution of the present invention, the borosilicate rubber used in the present invention is a special synthetic rubber containing carbon decaborane segments and siloxane segments in the main chain; As a preferred technical solution of the present invention, the fluorosilicone rubber used in the present invention is γ-trifluoropropylmethylpolysiloxane, which is a copolymer of methylsiloxane, vinylsiloxane and trifluoropropylsiloxane; As a preferred technical solution of the present invention, the fluoroether rubber used in the present invention is a binary copolymer of perfluoroalkyl vinyl ether and tetrafluoroethylene; The high-temperature modifier used in the present invention includes any one or a combination of at least two of asbestos, tetrafluoroethylene, aluminum oxide, polyimide, boron carbide and calcium oxide; The white carbon black used in the present invention includes any one or a combination of at least two of gas phase A200, gas phase A380, gas phase N20 and gas phase A100; The aramid staple fibers used in the present invention are prepared by cutting aramid fibers and have a length of 3-5 mm.

[0024] The coupling agent used in the present invention includes any one or a combination of at least two of vinyl tris (β-methoxyethoxy) silane, vinyl trichlorosilane, γ-aminopropyl triethoxysilane, vinyl triethoxysilane, methylmercaptopropyl dimethoxysilane or bis [(3-triethoxysilyl) propyl] tetrasulfide; As a preferred technical solution of the present invention, the zinc stearate used in the present invention is a product of Xilong Science Co., Ltd., and the grade is analytically pure (AR); The accelerator used in the present invention includes any one or a combination of at least two of triallyl isocyanurate (accelerator TAIC), N,N'-m-phenylene bismaleimide (HVA2), and trimethylolpropane trimethacrylate (TMPTMA); The vulcanizing agent used in the present invention includes any one or a combination of at least two of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (bis-2-5), dicumyl peroxide (DCP), and di-tert-butyl peroxide (DTBP); The antioxidants used in the present invention include any one or a combination of at least two of 2,2'-methylenebis(4-methyl-6-tert-butylphenol (antioxidant 2246), N-phenyl-β-naphthylamine (antioxidant D), 2,2,4-trimethyl-1,2-dihydroquinoline polymer (antioxidant RD), 2-mercaptobenzoimidazole (antioxidant MB), N,N-di-n-butyldithiocarbamate nickel (antioxidant NBC) and N-isopropyl-N'-phenyl-p-phenylenediamine (antioxidant 4010NA).

[0025] On the other hand, the technical solution provided by the present invention is a method for preparing a rubber sealing strip for composite materials, the steps of which include: S100, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber and a high-temperature modifier to obtain a rubber sealing strip modified rubber; S200, mixing the modified rubber for the rubber sealing strip with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant to obtain the rubber sealing strip compound; S300, vulcanizing the rubber sealing strip compound to obtain the rubber sealing strip.

[0026] Furthermore, step S100 includes S110, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber in an open rubber mixer to obtain a mixed raw rubber for rubber sealing strips; S120, mixing the rubber sealing strip mixed rubber and the high-temperature modifier in an open rubber mixer to obtain a modified rubber sealing strip; S130, preparing the modified rubber of the rubber sealing strip into a thin sheet of 0.5 mm to 1.5 mm in an open rubber mixer to obtain a modified rubber sealing strip film.

[0027] Furthermore, in step S110 and step S120, the temperature of the open rubber mixer is 30° C.-50° C.; the roller distance of the open rubber mixer is 1 mm-2 mm; and the mixing time of the open rubber mixer is 5 minutes-10 minutes; In step S130 , the temperature of the open rubber mixer is 25° C.-50° C.; the roller pitch of the open rubber mixer is 0.5 mm-1.5 mm; and the mixing time of the open rubber mixer is 3 minutes-8 minutes.

[0028] Furthermore, step S200 includes mixing the modified rubber sealing strip sheet obtained in step S100 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate and an antioxidant in a closed rubber mixer to obtain the rubber sealing strip compound.

[0029] Furthermore, in step S200, the temperature of the closed rubber mixer is 30° C.-60° C.; the rotation speed of the closed rubber mixer is 40 rpm-80 rpm; and the mixing time of the closed rubber mixer is 1 minute-5 minutes.

[0030] Furthermore, in step S300, the rubber sealing strip compound obtained in step S200 is vulcanized and molded in a flat vulcanizer to obtain a rubber sealing strip for a composite material.

[0031] Furthermore, in step S300 The vulcanization molding temperature is 150°C-180°C; The pressure of the vulcanization molding is 5MPa-15MPa; The vulcanization molding time is 20 minutes to 30 minutes.

[0032] In a second aspect, the present invention provides a rubber sealing strip for preparing a composite material as described in the first aspect, wherein the formulation and processing method include: Phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber are mixed in an open rubber mixer to obtain a rubber sealing strip mixed rubber. The mixed rubber and a high-temperature modifier are then mixed in an open rubber mixer to obtain a rubber sealing strip modified rubber. The obtained rubber sealing strip modified rubber is prepared into a 0.5-1.5 mm thin slice in an open rubber mixer and placed in a dark environment for 4-6 hours to obtain a rubber sealing strip modified film. Next, the obtained rubber sealing strip modified film is mixed with white carbon black, aramid staple fiber, a structural regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate and an antioxidant in a closed rubber mixer to obtain the described rubber sealing strip mixed rubber. Finally, the obtained rubber sealing strip mixed rubber is vulcanized and molded in a flat vulcanizing press to obtain the described rubber sealing strip suitable for preparing composite materials.

[0033] Preferably, the preparation method specifically comprises: Step S110, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber in an open rubber mixer to obtain a mixed raw rubber for rubber sealing strips; Step S120, mixing the mixed raw rubber obtained in step S110 and the high-temperature modifier in an open rubber mixer to obtain a modified rubber for rubber sealing strips; Step S130, preparing the modified rubber sealant strip obtained in step S120 into a 0.5-1.5 mm thin sheet in an open rubber mixer to obtain a modified rubber sealant strip sheet; Step S200, mixing the modified rubber sealing strip film obtained in step S130 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer to obtain the rubber sealing strip compound; Step S300: vulcanize and mold the rubber sealing strip compound obtained in step S200 in a flat vulcanizer to obtain the rubber sealing strip suitable for preparing composite materials.

[0034] Preferably, the mixing in step S110 and step S120 is performed in an open rubber mixer; Preferably, the mixing temperature of the open mill in step S110 and step S120 is 30-50°C, for example, it can be 30°C, 40°C, 50°C, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0035] Preferably, the roller spacing of the mixing mill in step S110 and step S120 is 1-2 mm, for example, it can be 1.0 mm, 1.5 mm, 2.0 mm, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0036] Preferably, the mixing time of the open mill in step S110 and step S120 is 5-10 minutes, for example, it can be 5 minutes, 8 minutes, 10 minutes, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0037] Preferably, the mixing in step S130 is performed in an open rubber mixer; Preferably, the mixing temperature of the open mill in step S130 is 25-50°C, for example, it can be 25°C, 30°C, 40°C, 50°C, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0038] Preferably, the roller spacing of the mixing mill in step S130 is 0.5-1.5 mm, for example, it can be 0.5 mm, 1.0 mm, 1.5 mm, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0039] Preferably, the mixing time of the open mill in step S130 is 3-8 minutes, for example, it can be 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, 8 minutes, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0040] Preferably, the mixing in step S200 is performed in a closed rubber mixer; Preferably, the mixing temperature of the closed rubber mixer in step S200 is 40-50°C, for example, it can be 40°C, 45°C, 50°C, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0041] Preferably, the speed of the closed rubber mixer in step S200 is 50-70 rpm, for example, it can be 50 rpm, 60 rpm, 70 rpm, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0042] Preferably, the mixing time of the internal mixer in step S200 is 2-4 minutes, for example, it can be 2 minutes, 3 minutes, 4 minutes, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0043] Preferably, the mixing in step S300 is performed in a vulcanization molding machine; Preferably, the temperature of the vulcanization molding in step S300 is 150-180°C, more preferably 160-170°C, for example, it can be 150°C, 155°C, 160°C, 165°C, 170°C, 175°C, 180°C, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range.

[0044] Preferably, the pressure of the vulcanization molding in step S300 is 5-15 MPa, more preferably 10-12 MPa, for example, it can be 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, 10 MPa, 12 MPa, 15 MPa, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0045] Preferably, the vulcanization molding time in step S300 is 20-30 minutes, for example, it can be 20 minutes, 25 minutes, 30 minutes, and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0046] In the present invention, phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber, and a high-temperature modifier are first mixed to obtain a modified rubber sealant strip; the modified rubber sealant strip is then mixed with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant to obtain a rubber sealant strip compound; and finally, the rubber sealant strip compound is vulcanized and molded in a flat vulcanizer to obtain the rubber sealant strip. Compared to the prior art, the material of the present invention can significantly improve high-temperature resistance and tear resistance, while simultaneously reducing the compression set and thermal expansion ratio of the rubber, making it suitable for mold sealing in the composite material preparation process.

[0047] The open rubber mixer used in the present invention is a general rubber mixing equipment, and is not limited in model and condition parameters, as long as it can prepare raw rubber and various fillers and additives into modified raw rubber.

[0048] The closed rubber mixer used in the present invention is a general rubber mixing equipment with a temperature control range of 30-200°C and a speed control range of 20-120 rpm. The specific model is not limited as long as the equipment meets the safety requirements and can evenly mix rubber, fillers and additives.

[0049] The vulcanizing machine used in the present invention is also called a flat vulcanizing machine. It is a general equipment for vulcanizing and molding mixed rubber. The temperature control range is 20-200°C and the pressure control range is 1-20MPa. The specific model is not limited as long as the equipment meets the safety requirements and can mold the product.

[0050] In a third aspect, the present invention provides a formula and processing method for preparing a rubber sealing strip for composite materials as described in the first aspect.

[0051] In addition, the technical solution provided by the present invention is the use of the above-mentioned rubber sealing strip for composite materials in the preparation of composite materials.

[0052] The beneficial effects of the present invention are as follows: first, phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber are mutually associated with each other through a high-temperature modifier to form a high-temperature resistant aggregate, thereby improving the high-temperature resistance of the material; then, by utilizing the interaction between the rubber matrix and aramid staple fibers, structural regulators, coupling agents and white carbon black, the high-temperature resistance and tear resistance of the cross-linked rubber sealing strip can be greatly improved, and at the same time, the compression permanent deformation and thermal expansion ratio of the rubber can be reduced, making it suitable for mold sealing in the preparation process of composite materials. DETAILED DESCRIPTION

[0053] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0054] The experimental materials used in the examples and comparative examples of the present invention are as follows: (1) Phenyl silicone rubber is a high molecular weight linear polysiloxane containing phenylsiloxane or methylphenylsiloxane segments in the main chain. It is a product of Dalian Jiacheng Polymer Technology Co., Ltd. and includes JC-200 (phenyl content 5%-15%), JC-300 (phenyl content 15%-25%), JC-350 (phenyl content 25%-35%), and JC-400 (phenyl content 40%).

[0055] (2) Borosilicate rubber is a special synthetic rubber containing carbon decaborane segments and siloxane segments in the main chain. It is a product of Dalian Ruisheng Rubber and Plastic Materials Co., Ltd., with the brand name BQR-300.

[0056] (3) Fluorosilicone rubber is γ-trifluoropropylmethylpolysiloxane, which is a copolymer of methylsiloxane, vinylsiloxane and trifluoropropylsiloxane. It is a product of DuPont Company in the United States and its brand is FVMQ.

[0057] (4) Fluoroether rubber is a binary copolymer of perfluoroalkyl vinyl ether and tetrafluoroethylene, a product of Solvay Group (Solvay), brand Tecnoflon FFKM PFR 94.

[0058] (5) Asbestos, tetrafluoroethylene, aluminum oxide, polyimide, boron carbide and calcium oxide are products of Dalian Bono Reagent Co., Ltd.

[0059] (6) Silica Fumed A100, Fumed A200, and Fumed A380 are products of Evonik (China) Investment Co., Ltd. Fumed N20 is a product of Wacker Chemie (China) Co., Ltd.

[0060] (7) Aramid staple fiber, product of DuPont Company, USA, brand: 1313.

[0061] (8) Diphenylsilanediol, hydroxy silicone oil and polytrifluoropropyl hydroxysiloxane are products of Dalian Bono Reagent Co., Ltd.

[0062] (9) The coupling agents vinyl tris(β-methoxyethoxy)silane and vinyl trichlorosilane were purchased from Nanjing Xiangqian Chemical Co., Ltd., with the brand name A172; γ-aminopropyl triethoxysilane was purchased from Wuhan Lvjing Fenghua Biotechnology Co., Ltd., with the brand name KH550; vinyl triethoxysilane was purchased from Shandong Yuanjin New Materials Co., Ltd., with the brand name A151; methylmercaptopropyl dimethoxysilane or bis[(3-triethoxysilyl)propyl] tetrasulfide was purchased from Shandong Yuanjin New Materials Co., Ltd., with the brand name Si69.

[0063] (10) The accelerators triallyl isocyanurate (accelerator TAIC), N,N'-m-phenylene bismaleimide (HVA2), and trimethylolpropane trimethacrylate (TMPTMA) are products of Dalian Ruisheng Rubber and Plastic Materials Co., Ltd.

[0064] (11) 2,5-Dimethyl-2,5-bis(tert-butylperoxy)hexane (bis-2-5), diisopropylbenzene peroxide (DCP), and di-tert-butyl peroxide (DTBP) are products of Dalian Ruisheng Rubber and Plastic Materials Co., Ltd.

[0065] (12) Zinc stearate is a product of Xilong Science Co., Ltd., grade: analytical grade (AR).

[0066] (13) Antioxidants include 2,2'-methylenebis(4-methyl-6-tert-butylphenol (antioxidant 2246), N-phenyl-β-naphthylamine (antioxidant D), 2,2,4-trimethyl-1,2-dihydroquinoline polymer (antioxidant RD), 2-mercaptobenzoimidazole (antioxidant MB), N,N-di-n-butyldithiocarbamate nickel (antioxidant NBC) and N-isopropyl-N'-phenyl-p-phenylenediamine (antioxidant 4010NA), which are products of Dalian Ruisheng Rubber and Plastic Materials Co., Ltd.

[0067] Example 1 This embodiment provides a rubber sealing strip for composite materials, the components of which include, by weight: 50 parts of phenyl silicone rubber JC-200 (phenyl content 5%-15%), 25 parts of borosilicate rubber, 20 parts of fluorosilicone rubber, 5 parts of fluoroether rubber, 5 parts of asbestos, 10 parts of fumed A200, 10 parts of aramid staple fiber, 5 parts of diphenylsilanediol, 5 parts of A172, 0.5 parts of TAIC, 1.0 parts of diphenyl 2-5, 1 part of zinc stearate, and 1 part of antioxidant 2246.

[0068] This embodiment also provides a method for preparing a rubber sealing strip for composite materials, the method comprising: Step S110, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber in an open rubber mixer at a mixing temperature of 30° C., a roller distance of 1 mm and a mixing time of 5 minutes to obtain a mixed raw rubber for a rubber sealing strip; Step S120, mixing the raw rubber of the rubber sealing strip obtained in step S110 and the high-temperature modifier in an open rubber mixer, with the mixing temperature of the mixer being 30° C., the roller distance being 1 mm, and the mixing time being 5 minutes, to obtain a modified rubber for the rubber sealing strip; Step S130: The modified rubber sealant obtained in step S120 is prepared into 0.5 mm thin sheets in an open rubber mixer at a mixing temperature of 25° C. for 3 minutes to obtain a modified rubber sealant sheet; Step S200, mixing the modified rubber sealing strip film obtained in step S130 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer, wherein the mixing temperature of the mixer is 40° C., the speed is 50 rpm, and the mixing time is 2 minutes to obtain the rubber sealing strip compound; Step S300: The rubber sealant strip mix obtained in step S200 was vulcanized and molded in a flat-plate vulcanizer at a molding temperature of 150°C, a pressure of 5 MPa, and a molding time of 30 minutes to obtain a rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0069] Example 2 This embodiment provides a rubber sealing strip for composite materials, the components of which include, by weight: 70 parts of phenyl silicone rubber JC-300 (phenyl content 15%-25%), 10 parts of borosilicate rubber, 10 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 10 parts of tetrafluoroethylene, 30 parts of fumed A380, 30 parts of aramid staple fiber, 10 parts of hydroxy silicone oil, 15 parts of KH550, 5 parts of HVA2, 3.0 parts of DCP, 2 parts of zinc stearate and 3 parts of antioxidant RD.

[0070] This embodiment also provides a method for preparing a rubber sealing strip for composite materials, the method comprising: Step S110, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber in an open rubber mixer at a mixing temperature of 50° C., a roller distance of 2 mm and a mixing time of 10 minutes to obtain a mixed raw rubber for a rubber sealing strip; Step S120, mixing the raw rubber of the rubber sealing strip obtained in step S110 and the high-temperature modifier in an open rubber mixer, with the mixing temperature of the mixer being 50° C., the roller distance being 2 mm, and the mixing time being 10 minutes, to obtain a modified rubber for the rubber sealing strip; Step S130: The modified rubber sealant obtained in step S120 is prepared into 1.5 mm thin sheets in an open rubber mixer at a mixing temperature of 50° C. for 8 minutes to obtain a modified rubber sealant sheet; Step S200, mixing the modified rubber sealing strip film obtained in step S130 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer, with the mixing temperature of the mixer being 50° C., the speed being 70 rpm, and the mixing time being 4 minutes to obtain the rubber sealing strip compound; Step S300: The rubber sealant strip mix obtained in step S200 was vulcanized in a flat-plate vulcanizer at a temperature of 180°C, a pressure of 15 MPa, and a molding time of 20 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0071] Example 3 This embodiment provides a rubber sealing strip for a composite material, the components of which include, by weight, 60 parts of JC-350 (phenyl content 25-35%), 20 parts of borosilicate rubber, 10 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 8 parts of boron carbide, 20 parts of vapor-phase N20, 15 parts of aramid staple fibers, 8 parts of polytrifluoropropyl hydroxysiloxane, 10 parts of A151, 3 parts of TMPTMA, 1.5 parts of DTBP, 1.5 parts of zinc stearate, and 2 parts of antioxidant 4010NA.

[0072] This embodiment also provides a method for preparing a rubber sealing strip for composite materials, the method comprising: Step S110, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber in an open rubber mixer at a mixing temperature of 40° C., a roller distance of 1.5 mm and a mixing time of 8 minutes to obtain a mixed raw rubber for a rubber sealing strip; Step S120, mixing the raw rubber of the rubber sealing strip obtained in step S110 and the high-temperature modifier in an open rubber mixer, with the mixing temperature of the mixer being 40° C., the roller distance being 1.5 mm, and the mixing time being 7 minutes, to obtain a modified rubber for the rubber sealing strip; Step S130: The modified rubber sealant obtained in step S120 is prepared into 1 mm thin sheets in an open rubber mixer at a mixing temperature of 30° C. for 5 minutes to obtain a modified rubber sealant sheet; Step S200, mixing the modified rubber sealing strip film obtained in step S130 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer, wherein the mixing temperature of the mixer is 45° C., the speed is 60 rpm, and the mixing time is 3 minutes to obtain the rubber sealing strip compound; Step S300: The rubber sealant strip mix obtained in step S200 was vulcanized and molded in a flat-plate vulcanizer at a molding temperature of 160°C, a pressure of 10 MPa, and a molding time of 25 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0073] Example 4 This embodiment provides a rubber sealing strip for a composite material, the components of which include, by weight: 60 parts of phenyl silicone rubber JC-400 (phenyl content 40%), 10 parts of borosilicate rubber, 20 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 8 parts of polyimide, 20 parts of fumed A100, 20 parts of aramid staple fiber, 8 parts of polytrifluoropropyl hydroxysiloxane, 10 parts of Si69, 3 parts of TAIC, 1.5 parts of bis 2-5, 1.5 parts of zinc stearate, 1 part of antioxidant D, and 1 part of antioxidant MB.

[0074] This embodiment also provides a method for preparing a rubber sealing strip for composite materials, the method comprising: Step S110, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber in an open rubber mixer at a mixing temperature of 40° C., a roller distance of 1 mm and a mixing time of 5 minutes to obtain a mixed raw rubber for a rubber sealing strip; Step S120, mixing the mixed raw rubber of the rubber sealing strip obtained in step S110 and the high-temperature modifier in an open rubber mixer, with the mixing temperature of the open mixer being 30° C., the roller distance being 1 mm, and the mixing time being 5 minutes, to obtain a modified rubber for the rubber sealing strip; Step S130: The modified rubber sealant obtained in step S120 is prepared into 1.2 mm thin sheets in an open rubber mixer at a mixing temperature of 40° C. for 5 minutes to obtain a modified rubber sealant sheet; Step S200, mixing the modified rubber sealing strip film obtained in step S130 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer, with the mixing temperature of the mixer being 50° C., the speed being 60 rpm, and the mixing time being 3 minutes to obtain the rubber sealing strip compound; Step S300: The rubber sealant strip mix obtained in step S200 was vulcanized and molded in a flat-plate vulcanizer at a molding temperature of 170°C, a pressure of 10 MPa, and a molding time of 25 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0075] Example 5 This embodiment provides a rubber sealing strip for composite materials, the components of which include, by weight: 55 parts of phenyl silicone rubber JC-350 (phenyl content 25-35%), 25 parts of borosilicate rubber, 10 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 8 parts of aluminum oxide, 20 parts of fumed A380, 20 parts of aramid staple fibers, 5 parts of polytrifluoropropyl hydroxysiloxane, 10 parts of KH550, 2 parts of HVA2, 1.0 part of DCP, 1 part of zinc stearate, 1 part of antioxidant NBC, and 1 part of antioxidant 4010NA.

[0076] This embodiment also provides a method for preparing a rubber sealing strip for composite materials, the method comprising: Step S110, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber in an open rubber mixer at a mixing temperature of 50° C., a roller distance of 2 mm and a mixing time of 10 minutes to obtain a mixed raw rubber for a rubber sealing strip; Step S120, mixing the mixed raw rubber obtained in step S110 and the high-temperature modifier in an open rubber mixer, with the mixing temperature of the open mixer being 50° C., the roller distance being 2 mm, and the mixing time being 10 minutes, to obtain a modified rubber for the rubber sealing strip; Step S130: The modified rubber sealant obtained in step S120 is prepared into 1 mm thin sheets in an open rubber mixer at a mixing temperature of 50° C. for 8 minutes to obtain a modified rubber sealant sheet; Step S200, mixing the modified rubber sealing strip film obtained in step S130 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer, with the mixing temperature of the mixer being 50° C., the speed being 70 rpm, and the mixing time being 4 minutes to obtain the rubber sealing strip compound; Step S300: The rubber sealant strip mix obtained in step S300 was vulcanized and molded in a flat-plate vulcanizer at a molding temperature of 180°C, a pressure of 15 MPa, and a molding time of 20 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0077] Example 6 This embodiment provides a rubber sealing strip for composite materials, the components of which include, by weight, 20 parts of phenyl silicone rubber JC-200 (phenyl content 5%-15%), 10 parts of JC-300 (phenyl content 15%-25%), 20 parts of JC-350 (phenyl content 25-35%), 10 parts of JC-400 (phenyl content 40%), 20 parts of borosilicate rubber, 15 parts of fluorosilicone rubber, 5 parts of fluoroether rubber, 5 parts of asbestos, 5 parts of calcium oxide, 20 parts of fumed A380, 15 parts of aramid staple fiber, 10 parts of polytrifluoropropyl hydroxysiloxane, 5 parts of KH550, 5 parts of Si69, 1 part of TAIC, 1 part of TMPTMA, 1.01 parts of bis(2-5), 1 part of DTBP, 2 parts of zinc stearate, 1 part of antioxidant 2246, and 1 part of antioxidant D.

[0078] This embodiment also provides a method for preparing a rubber sealing strip for composite materials, the method comprising: Step S110, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber in an open rubber mixer at a mixing temperature of 30° C., a roller distance of 1 mm and a mixing time of 5 minutes to obtain a mixed raw rubber for a rubber sealing strip; Step S120, mixing the raw rubber of the rubber sealing strip obtained in step S110 and the high-temperature modifier in an open rubber mixer, with the mixing temperature of the mixer being 30° C., the roller distance being 1 mm, and the mixing time being 5 minutes, to obtain a modified rubber for the rubber sealing strip; Step S130: The modified rubber sealant obtained in step S120 is prepared into 0.5 mm thin sheets in an open rubber mixer at a mixing temperature of 25° C. for 3 minutes to obtain a modified rubber sealant sheet; Step S200, mixing the modified rubber sealing strip film obtained in step S130 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer, wherein the mixing temperature of the mixer is 40° C., the speed is 50 rpm, and the mixing time is 2 minutes to obtain the rubber sealing strip compound; Step S300: The rubber sealant strip mix obtained in step S200 was vulcanized and molded in a flat-plate vulcanizer at a molding temperature of 150°C, a pressure of 5 MPa, and a molding time of 30 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0079] Comparative Example 1 This comparative example provides a rubber sealing strip for a composite material, the components of which include, by weight: 60 parts of phenyl silicone rubber JC-350 (phenyl content 25-35%), 20 parts of borosilicate rubber, 10 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 8 parts of boron carbide, 20 parts of gas-phase N20, 15 parts of aramid staple fibers, 8 parts of polytrifluoropropyl hydroxysiloxane, 10 parts of A151, 3 parts of TMPTMA, 1.5 parts of DTBP, 1.5 parts of zinc stearate and 2 parts of antioxidant 4010NA.

[0080] This comparative example also provides a method for preparing a rubber sealing strip for a composite material, the method comprising: Step H110, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber, and a high-temperature modifier in an open rubber mixer at a mixing temperature of 40° C., a roller distance of 1.5 mm, and a mixing time of 8 minutes to obtain a modified rubber for a rubber sealing strip; Step H120: The modified rubber sealant obtained in step H110 is prepared into 1 mm thin sheets in an open rubber mixer at a mixing temperature of 30° C. for 5 minutes to obtain a modified rubber sealant sheet; Step H200, mixing the modified rubber sealing strip film obtained in step H120 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer at a mixing temperature of 45° C., a speed of 60 rpm, and a mixing time of 3 minutes to obtain the rubber sealing strip compound; Step H300: The rubber sealant strip mix obtained in Step H200 was vulcanized in a flat-plate vulcanizer at a temperature of 160°C, a pressure of 10 MPa, and a molding time of 25 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0081] Comparative Example 2 This embodiment provides a rubber sealing strip for a composite material, the components of which include, by weight: 60 parts of phenyl silicone rubber JC-350 (phenyl content 25-35%), 20 parts of borosilicate rubber, 10 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 8 parts of boron carbide, 20 parts of vapor-phase N20, 15 parts of aramid staple fibers, 8 parts of polytrifluoropropyl hydroxysiloxane, 10 parts of A151, 3 parts of TMPTMA, 1.5 parts of DTBP, 1.5 parts of zinc stearate, and 2 parts of antioxidant 4010NA.

[0082] This comparative example also provides a method for preparing a rubber sealing strip for composite materials, the method comprising: Step H100, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber, and a high-temperature modifier in an open rubber mixer at a mixing temperature of 40° C., a roller distance of 1.5 mm, and a mixing time of 8 minutes to obtain a modified rubber sealant strip; Step H200, mixing the modified rubber sealant obtained in step H110 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer at a mixing temperature of 45° C., a speed of 60 rpm, and a mixing time of 3 minutes to obtain the rubber sealant rubber compound; Step H300: The rubber sealant strip mix obtained in Step H200 was vulcanized in a flat-plate vulcanizer at a temperature of 160°C, a pressure of 10 MPa, and a molding time of 25 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0083] Comparative Example 3 This comparative example provides a rubber sealing strip for a composite material, the components of which include, by weight: 60 parts of phenyl silicone rubber JC-350 (phenyl content 25-35%), 20 parts of borosilicate rubber, 10 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 8 parts of boron carbide, 20 parts of gas-phase N20, 15 parts of aramid staple fibers, 8 parts of polytrifluoropropyl hydroxysiloxane, 10 parts of A151, 3 parts of TMPTMA, 1.5 parts of DTBP, 1.5 parts of zinc stearate and 2 parts of antioxidant 4010NA.

[0084] This comparative example also provides a method for preparing a rubber sealing strip for a composite material, the method comprising: Step H100, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber, high-temperature modifier, white carbon black, aramid staple fiber, structure regulator, coupling agent, accelerator, vulcanizing agent, zinc stearate and antioxidant in a closed rubber mixer, with the mixing temperature of the mixer being 45° C., the speed being 60 rpm, and the mixing time being 3 minutes to obtain the rubber sealant strip compound; Step H200: The rubber sealant strip mix obtained in Step H100 was vulcanized in a flat-plate vulcanizer at a temperature of 160°C, a pressure of 10 MPa, and a molding time of 25 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0085] Comparative Example 4 This comparative example provides a rubber sealing strip for a composite material, the components of which include, by weight: 60 parts of phenyl silicone rubber JC-350 (phenyl content 25-35%), 20 parts of borosilicate rubber, 10 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 20 parts of gaseous N20, 8 parts of polytrifluoropropyl hydroxysiloxane, 10 parts of A151, 3 parts of TMPTMA, 1.5 parts of DTBP, 1.5 parts of zinc stearate and 2 parts of antioxidant 4010NA.

[0086] This comparative example also provides a method for preparing a rubber sealing strip for a composite material, the method comprising: Step H100, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber, white carbon black, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer at a mixing temperature of 45° C., a speed of 60 rpm, and a mixing time of 3 minutes to obtain the rubber sealing strip compound; Step H200: The rubber sealant strip mix obtained in Step H100 was vulcanized in a flat-plate vulcanizer at a temperature of 160°C, a pressure of 10 MPa, and a molding time of 25 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0087] Comparative Example 5 This comparative example provides a rubber sealing strip for a composite material, the components of which include, by weight: 50 parts of phenyl silicone rubber JC-200 (phenyl content 5%-15%), 25 parts of borosilicate rubber, 20 parts of fluorosilicone rubber, 5 parts of fluoroether rubber, 10 parts of fumed A200, 5 parts of diphenylsilanediol, 5 parts of A172, 0.5 parts of TAIC, 1.0 parts of diphenyl 2-5, 1 part of zinc stearate and 1 part of antioxidant 2246.

[0088] This comparative example also provides a method for preparing a rubber sealing strip for composite materials, the method comprising: Step H100, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber, white carbon black, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer at a mixing temperature of 40° C., a speed of 50 rpm, and a mixing time of 2 minutes to obtain the rubber sealing strip compound; Step H200: The rubber sealant strip mix obtained in Step H100 was vulcanized in a flat-plate vulcanizer at a temperature of 150°C, a pressure of 5 MPa, and a molding time of 30 minutes to produce the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0089] Comparative Example 6 This comparative example provides a rubber sealing strip for a composite material, the components of which include, by weight: 70 parts of phenyl silicone rubber JC-300 (phenyl content 15%-25%), 10 parts of borosilicate rubber, 10 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 30 parts of vapor phase A380, 10 parts of hydroxy silicone oil, 15 parts of KH550, 5 parts of HVA2, 3.0 parts of DCP, 2 parts of zinc stearate and 3 parts of antioxidant RD.

[0090] This comparative example also provides a method for preparing a rubber sealing strip for composite materials, the method comprising: Step H100, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber, white carbon black, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer at a mixing temperature of 50° C., a speed of 70 rpm, and a mixing time of 4 minutes to obtain the rubber sealing strip compound; Step H200: The rubber sealant strip mix obtained in Step H100 was vulcanized in a flat-plate vulcanizer at a temperature of 180°C, a pressure of 15 MPa, and a molding time of 20 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0091] Comparative Example 7 This comparative example provides a rubber sealing strip for a composite material, the components of which include, by weight: 60 parts of phenyl silicone rubber JC-400 (phenyl content 40%), 10 parts of borosilicate rubber, 20 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 20 parts of fumed A100, 8 parts of polytrifluoropropyl hydroxysiloxane, 10 parts of Si69, 3 parts of TAIC, 1.5 parts of bis 2-5, 1.5 parts of zinc stearate and 1 part of antioxidant D and 1 part of antioxidant MB.

[0092] This comparative example also provides a method for preparing a rubber sealing strip for composite materials, the method comprising: Step H100, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber, white carbon black, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer at a mixing temperature of 50° C., a speed of 60 rpm, and a mixing time of 3 minutes to obtain the rubber sealing strip compound; Step H200: The rubber sealant strip mix obtained in Step H100 was vulcanized in a flat-plate vulcanizer at a temperature of 170°C, a pressure of 10 MPa, and a molding time of 25 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0093] Comparative Example 8 This comparative example provides a formula for preparing a rubber sealing strip for a composite material, the components of which include, by weight: 55 parts of phenyl silicone rubber JC-350 (phenyl content 25-35%), 25 parts of borosilicate rubber, 10 parts of fluorosilicone rubber, 10 parts of fluoroether rubber, 20 parts of fumed A380, 5 parts of polytrifluoropropyl hydroxysiloxane, 10 parts of KH550, 2 parts of HVA2, 1.0 part of DCP, 1 part of zinc stearate and 1 part of antioxidant NBC, 1 part of antioxidant 4010NA.

[0094] This comparative example also provides a processing method for preparing a rubber sealing strip for composite materials, the method comprising: Step H100, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber, white carbon black, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer at a mixing temperature of 50° C., a speed of 70 rpm, and a mixing time of 4 minutes to obtain the rubber sealing strip compound; Step H200: The rubber sealant strip mix obtained in Step H100 was vulcanized in a flat-plate vulcanizer at a temperature of 180°C, a pressure of 15 MPa, and a molding time of 20 minutes to obtain the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0095] Comparative Example 9 This comparative example provides a formula for preparing a rubber sealing strip for a composite material, the components of which include, by weight: 20 parts of phenyl silicone rubber JC-200 (phenyl content 5%-15%), 10 parts of JC-300 (phenyl content 15%-25%), 20 parts of JC-350 (phenyl content 25-35%), 10 parts of JC-400 (phenyl content 40%), 20 parts of borosilicate rubber, 15 parts of fluorosilicone rubber, 5 parts of fluoroether rubber, 20 parts of fumed A380, 10 parts of polytrifluoropropyl hydroxysiloxane, 5 parts of KH550, 5 parts of Si69, 1 part of TAIC, 1 part of TMPTMA, 1.01 parts of bis 2-5, 1 part of DTBP, 2 parts of zinc stearate and 1 part of antioxidant 2246 and 1 part of antioxidant D.

[0096] This comparative example also provides a processing method for preparing a rubber sealing strip for composite materials, the method comprising: Step H100, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber, white carbon black, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant in a closed rubber mixer at a mixing temperature of 40° C., a speed of 50 rpm, and a mixing time of 2 minutes to obtain the rubber sealing strip compound; Step H200: The rubber sealant strip mix obtained in Step H100 was vulcanized in a flat-plate vulcanizer at a temperature of 150°C, a pressure of 5 MPa, and a molding time of 30 minutes to produce the rubber sealant strip suitable for preparing composite materials. The rubber sealant strip was tested for thermal expansion ratio, mechanical properties, tear strength, and compression set (25%, 200°C for 72 hours). The test results are shown in Tables 1 and 2.

[0097] Table 1

[0098] Calculate according to the formula: thermal expansion ratio = (diameter of rubber sealing strip at 200℃ - diameter of rubber sealing strip at 25℃) / diameter of rubber sealing strip at 25℃; The tensile strength and elongation at break were tested according to the national standard "GB / T 528-2009 Vulcanized rubber or thermoplastic rubber - Determination of tensile stress-strain properties".

[0099] Table 2

[0100] The test was carried out in accordance with the national standard "GB / T 529-2008 Vulcanized rubber or thermoplastic rubber - Determination of tear strength (trouser-shaped, right-angled and crescent-shaped specimens)", using a right-angled specimen; The test was carried out in accordance with the national standard "GB / T 7759.1-2015 Vulcanized rubber or thermoplastic rubber - Determination of compression set - Part 1: At room and elevated temperatures", with a compression of 25% and a test temperature of 200°C for 72 hours.

[0101] It can be seen from Examples 1-6 that, with different formulations and processing methods of rubber sealing strips, the thermal expansion ratio, tensile strength, elongation at break, tear strength and compression set of rubber sealing strip products vary slightly. However, the thermal expansion ratio and mechanical properties of the products provided in the examples are superior to those of the prior art products in the comparative examples, and are worthy of promotion and application.

[0102] Analysis of Example 3 and Comparative Examples 1-4 demonstrates that the composite rubber sealing strips provided in these examples all outperform the comparative examples in terms of performance, respectively, of Comparative Example 1, which eliminates step S120; Comparative Example 2, which eliminates both steps S120 and S130; Comparative Example 3, which simplifies steps S110, S120, S130, and S200; and Comparative Example 4, which simplifies steps S110, S120, S130, and S200 but does not add a high-temperature modifier or aramid fiber. Comparative Example 4 represents a prior art product, demonstrating the significant effectiveness of the present invention in improving the product's mechanical and tear properties and reducing its thermal expansion ratio and compression set.

[0103] Comparative Examples 5, 6, 7, 8, and 9 represent the performance data of the prior art processes for the products of Examples 1, 2, 4, 5, and 6, respectively. Analysis of the data reveals that the thermal expansion ratio, tensile strength, elongation at break, tear strength, and compression set of the rubber sealing strips of the prior art are all lower than those of the corresponding examples, demonstrating that the products and preparation methods of the present invention are significantly effective.

[0104] Based on the above data analysis, the formula and processing method of the rubber sealing strip for composite materials provided in the embodiment can improve the mechanical properties and tear properties of the product, and reduce the thermal expansion ratio and permanent compression set of the product, compared with the prior art. This solves the problems of poor sealing performance, insufficient temperature resistance, and poor molding stability of the rubber sealing strip in the composite material molding process in the prior art.

[0105] The applicant declares that while the present invention uses the above-described embodiments to illustrate the rubber sealing strip for preparing composite materials, the present invention is not limited to the above-described embodiments, nor does it imply that the present invention must rely on the above-described embodiments in order to be implemented. Persons skilled in the art should understand that any improvements to the present invention, equivalent substitutions for various raw materials in the present invention, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A rubber sealing strip for composite materials, characterized by: The components include, by weight, 50-70 parts of phenyl silicone rubber, 10-25 parts of borosilicate rubber, 10-20 parts of fluorosilicone rubber, 5-10 parts of fluoroether rubber, 5-10 parts of high-temperature modifier, 10-30 parts of white carbon black, 10-30 parts of aramid staple fibers, 5-10 parts of structure regulator, 5-15 parts of coupling agent, 0.5-5 parts of accelerator, 1.0-3.0 parts of vulcanizing agent, 1-2 parts of zinc stearate and 1-3 parts of antioxidant.

2. The rubber sealing strip for composite materials according to claim 1, characterized in that: The high temperature modifier includes one or at least two of asbestos, tetrafluoroethylene, aluminum oxide, polyimide, boron carbide and calcium oxide; The white carbon black includes one or at least two of gas phase A200, gas phase A380, gas phase N20 and gas phase A100; The structure regulator includes one or at least two of diphenylsilanediol, hydroxy silicone oil and polytrifluoropropyl hydroxysiloxane.

3. A method for preparing a rubber sealing strip for composite materials, characterized in that: Steps include S100, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber, fluoroether rubber and a high-temperature modifier to obtain a rubber sealing strip modified rubber; S200, mixing the modified rubber for the rubber sealing strip with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate, and an antioxidant to obtain a rubber sealing strip compound; S300, vulcanizing the rubber sealing strip compound to obtain a rubber sealing strip.

4. The method for preparing a rubber sealing strip for composite materials according to claim 3, characterized in that: Step S100 includes S110, mixing phenyl silicone rubber, borosilicate rubber, fluorosilicone rubber and fluoroether rubber in an open rubber mixer to obtain a mixed raw rubber for rubber sealing strips; S120, mixing the rubber sealing strip mixed raw rubber and the high-temperature modifier in an open rubber mixer to obtain a rubber sealing strip modified rubber; S130, preparing the modified rubber of the rubber sealing strip into a thin sheet of 0.5 mm to 1.5 mm in an open rubber mixer to obtain a modified rubber sealing strip film.

5. The method for preparing a rubber sealing strip for composite materials according to claim 4, characterized in that: In step S110 and step S120, the temperature of the open rubber mixer is 30° C.-50° C.; the roller distance of the open rubber mixer is 1 mm-2 mm; and the mixing time of the open rubber mixer is 5 minutes-10 minutes. In step S130 , the temperature of the open rubber mixer is 25° C.-50° C.; the roller pitch of the open rubber mixer is 0.5 mm-1.5 mm; and the mixing time of the open rubber mixer is 3 minutes-8 minutes.

6. The method for preparing a rubber sealing strip for composite materials according to claim 3, characterized in that: Step S200 comprises mixing the modified rubber sealing strip sheet obtained in step S100 with white carbon black, aramid staple fiber, a structure regulator, a coupling agent, an accelerator, a vulcanizing agent, zinc stearate and an antioxidant in a closed rubber mixer to obtain the rubber sealing strip compound.

7. The method for preparing a rubber sealing strip for composite materials according to claim 6, characterized in that: In step S200, the temperature of the closed rubber mixer is 30° C.-60° C.; the rotation speed of the closed rubber mixer is 40 rpm-80 rpm; and the mixing time of the closed rubber mixer is 1 minute-5 minutes.

8. The method for preparing a rubber sealing strip for composite materials according to claim 3, characterized in that: In step S300, the rubber sealing strip compound obtained in step S200 is vulcanized and formed in a flat vulcanizer to obtain a rubber sealing strip for a composite material.

9. The method for preparing a rubber sealing strip for composite materials according to claim 8, characterized in that: In step S300 The vulcanization molding temperature is 150°C-180°C; The vulcanization molding pressure is 5MPa-15MPa; The vulcanization molding time is 20 minutes to 30 minutes.

10. Use of the rubber sealing strip for composite materials according to claim 1 in preparing composite materials.

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