Novel high-performance SSB forming net

Abstract

The invention relates to a novel high-performance SSB forming net, and relates to the technical field of forming nets, the SSB forming net comprises a paper forming layer, a connecting layer and a machine layer, the paper forming layer is formed by weaving paper forming layer warps and paper forming layer wefts in a staggered manner, and the machine layer is formed by weaving machine layer warps and machine layer wefts in a staggered manner. The SSB forming net comprises an SSB forming net body and a high-performance coating, and the high-performance coating is obtained by coating a high-performance coating. The high-performance coating is prepared from the following components in parts by mass: 40 to 50 parts of polyurethane resin, 5 to 10 parts of fluorocarbon modified organic silicon resin, 10 to 20 parts of wear-resistant reinforcing filler, 5 to 15 parts of toughening filler, 8 to 15 parts of isocyanate curing agent, 20 to 30 parts of xylene, 0.3 to 0.5 part of defoaming agent and 0.5 to 1 part of flatting agent. The SSB forming net has the effect of improving the wear resistance, the tensile property and the hydrophobic property of the SSB forming net, the forming net has high tensile strength and good wear resistance, moisture of paper sheets can be rapidly removed, and good working performance can be kept for a long time.

Description

Technical Field

[0001] The present application relates to the technical field of forming meshes, and in particular to a new type of high-performance SSB forming mesh. Background Art

[0002] In the Fourdrinier papermaking process, pulp is piped from the pulp pool to the headbox. From there, it is sprayed onto the surface of the papermaking fabric running in the forming section of the paper machine. There, the pulp is formed into a sheet and most of its moisture is removed. As the forming fabric circulates around the forming section, its bottom surface constantly rubs against the paper machine. Therefore, the forming fabric must simultaneously meet the requirements of sheet formation, dehydration, and wear resistance. The forming fabric is a critical forming and dewatering component in the wet section of papermaking equipment.

[0003] The SSB papermaking three-layer forming fabric consists of a paper-forming layer, a connecting layer, and a machine layer. The paper-forming layer is formed by interweaving the paper-forming layer warp and the paper-forming layer weft. The machine layer is formed by interweaving the machine layer warp and the machine layer weft. The machine layer weft has a larger diameter than the machine layer warp, creating a certain height difference between the machine layer weft and the machine layer warp. This increases the wear volume of the larger diameter machine layer weft, thereby improving the wear resistance of the forming fabric and extending the service life of the forming fabric. However, with the continuous increase in paper machine speed, the wear resistance of existing SSB forming fabrics has been unable to meet the increasing speed, reducing the service life of the SSB forming fabric, and needs to be improved. Summary of the Invention

[0004] In order to improve the performance of the SSB forming mesh, the present application provides a new high-performance SSB forming mesh.

[0005] The present application provides a new type of high-performance SSB forming fabric adopts the following technical solutions: A novel high-performance SSB forming mesh comprises an SSB forming mesh body and a high-performance coating. The high-performance coating is obtained by applying a high-performance coating. The high-performance coating comprises the following components in parts by weight: 40-50 parts polyurethane resin 5-10 parts of fluorocarbon modified silicone resin 10-20 parts of wear-resistant reinforcing filler 5-15 parts toughening filler 8-15 parts of isocyanate curing agent 20-30 parts of xylene 0.3-0.5 parts of defoaming agent 0.5-1 part of leveling agent.

[0006] Polyurethane resin has good flexibility and mechanical strength, and can form a continuous and tough coating matrix. The urethane bonds in its molecular structure can effectively transfer and disperse stress, thereby improving the tensile properties of the SSB forming mesh. The fluorine atoms in the fluorocarbon modified silicone resin have high electronegativity, and the fluorocarbon bonds formed have large bond energy and low surface energy, which can improve the hydrophobicity of the coating, reduce the adhesion and infiltration of liquids on the mesh surface, and improve the dehydration and stain resistance of the SSB forming mesh. Its silicon-oxygen bonds give the molecules flexibility, which helps to improve the flexibility of the coating and cooperate with the polyurethane resin to improve the tensile properties. The wear-resistant reinforcing filler is evenly dispersed in the coating. When subjected to friction, it can resist the cutting and scratching of external abrasive particles with its own high hardness, effectively improving the wear resistance. The toughening filler itself has high tensile strength and can play a role in strengthening the skeleton in the coating, improving the toughness of the coating. When the SSB forming mesh is subjected to external tensile force, it can better absorb energy, avoid breakage due to stress concentration, and greatly improve the tensile properties.

[0007] Preferably, the raw materials for preparing the polyurethane resin include polycarbonate diol, isophorone diisocyanate and a hydrophobically modified chain extender.

[0008] Polycarbonate diol serves as a soft segment, which gives the polyurethane resin good flexibility and resilience, and can effectively improve the deformation ability of the SSB forming mesh during stretching, making it less likely to break when subjected to external force, and significantly enhancing the tensile properties; isophorone diisocyanate serves as a hard segment, and the isocyanate group in its structure has high reactivity, which can undergo polymerization reaction with the terminal hydroxyl groups of polycarbonate diol and the active groups of the hydrophobically modified chain extender to construct the molecular main chain of the polyurethane resin, forming a regular structure with a certain rigidity, enhancing the overall cohesion and hardness of the resin, and thereby improving the wear resistance of the coating; the hydrophobic groups in the hydrophobically modified chain extender molecules are directionally arranged in the polyurethane resin system and migrate to the coating surface, reducing the surface energy, making the coating have excellent hydrophobicity, and improving the dehydration performance and stain resistance of the SSB forming mesh. At the same time, the chain extender extends the polyurethane molecular chain through chemical reactions, increases the interaction between molecules, and further enhances the tensile properties and wear resistance.

[0009] Preferably, the raw materials for preparing the hydrophobically modified chain extender include nano-silica, 3-chloropropyltrimethoxysilane and octanediamine.

[0010] Nano-silica has a large specific surface area and high chemical activity, providing abundant sites for subsequent chemical reactions; 3-chloropropyltrimethoxysilane can undergo hydrolysis and condensation reaction on the surface of nano-silica, and its siloxane part combines with nano-silica, with the chloropropyl group extending outward, thus achieving the initial modification of nano-silica; the introduction of octanediamine further reacts with the modified nano-silica, and the amino group and the chloropropyl group undergo substitution reaction. The long carbon chain structure of octanediamine not only increases the flexibility of the molecule, but also brings hydrophobicity to the entire hydrophobic modified chain extender; the hydrophobic modified chain extender is introduced into the polymer. After being incorporated into the urethane molecular chain, the micro-nano size effect of nano-silica enables it to migrate to the coating surface in the polyurethane resin system and construct a micro-nano structure on the coating surface. This micro-nano structure synergizes with the long carbon chain groups with low surface energy to enhance the hydrophobic properties of the SSB forming mesh, thereby improving the dehydration performance and stain resistance. The rigid nano-silica core and the flexible long carbon chain synergize to enhance the interaction between polyurethane resin molecules, improve the tensile strength and wear resistance of the resin, and enable the SSB forming mesh to withstand greater external forces during the stretching process and resist more friction losses in daily use.

[0011] Preferably, the hydrophobically modified chain extender is prepared by the following steps: The nano-silica is dispersed in a solvent, 3-chloropropyltrimethoxysilane is added, the pH is adjusted to acidic, heating and stirring are performed, octanediamine is added, heating and stirring are performed, cooling is performed after the reaction is completed, centrifugation is performed, washing, and drying are performed to obtain a hydrophobically modified chain extender.

[0012] The hydrophobically modified chain extender prepared according to the above steps has good reaction performance and can effectively improve the wear resistance, tensile properties and hydrophobicity of the SSB forming mesh.

[0013] Preferably, the raw materials for preparing the fluorocarbon-modified silicone resin include octamethylcyclotetrasiloxane, methyltrimethoxysilane and γ-trifluoropropyltrimethoxysilane.

[0014] The silicon-oxygen bond of octamethylcyclotetrasiloxane gives the molecular chain good flexibility and chemical stability, which can improve the flexibility of the coating. When the forming mesh is subjected to tensile force, it helps the orientation and slippage of the molecular chain segments, enhances its tensile properties, and at the same time can buffer external friction forces and improve wear resistance. The participation of methyltrimethoxysilane in the reaction can introduce methyl groups into the resin structure. The low surface energy characteristics of the methyl group initially improve the surface properties of the resin, laying the foundation for improving hydrophobicity. The trifluoropropyl group in the γ-trifluoropropyltrimethoxysilane molecule contains a strongly electronegative fluorine atom. The carbon-fluorine bonds formed by atoms have low surface energy. During the synthesis of fluorocarbon-modified silicone resin, these trifluoropropyl groups are enriched on the resin surface to form a fluorocarbon layer with low surface energy. When applied to the high-performance coating of SSB forming mesh, the fluorocarbon layer reduces the free energy of the coating surface, significantly increases the contact angle of the liquid on the mesh surface, and gives the forming mesh excellent hydrophobicity, thereby improving the dehydration performance and stain resistance of the SSB forming mesh; the fluorocarbon-modified silicone resin and the polyurethane resin form an interpenetrating network structure, which makes the interior of the coating denser and more stable, and enhances the cohesion and wear resistance of the coating.

[0015] Preferably, the mass ratio of octamethylcyclotetrasiloxane, methyltrimethoxysilane and γ-trifluoropropyltrimethoxysilane is 1:0.3:(0.1-0.2).

[0016] The fluorocarbon-modified silicone resin prepared according to the above mass ratio can effectively improve the wear resistance, tensile properties and hydrophobic properties of the SSB forming mesh.

[0017] Preferably, the raw materials for preparing the wear-resistant reinforcing filler include nano-silicon carbide, nano-aluminum oxide and polyester-type hyperdispersant.

[0018] Nano-silicon carbide has high hardness. When the SSB forming mesh faces external friction, it can effectively resist the cutting and scratching of abrasive particles with its own high hardness, reducing the material loss of the coating caused by friction; Nano-aluminum oxide has high hardness and good chemical stability. It works synergistically with nano-silicon carbide to form a uniformly distributed hard support structure inside the coating, further enhancing the resistance to friction force. The high specific surface area of nano-aluminum oxide helps to better combine with the resin matrix, improve the interfacial bonding strength, and more effectively play a wear-resistant role; Polyester-type hyperdispersants play a key dispersing and stabilizing role. One end of the polyester-type hyperdispersant molecule can be adsorbed on the surface of the nanoparticles through chemical bonds or strong interactions, and the solvated chain at the other end produces a steric hindrance effect, preventing the nanoparticles from re-aggregating, ensuring that nano-silicon carbide and nano-aluminum oxide are evenly dispersed in the coating, giving full play to their high hardness advantages and improving wear resistance.

[0019] Preferably, the raw materials for preparing the toughening filler include chopped aramid fibers, carbon nanotubes and γ-aminopropyltriethoxysilane.

[0020] Chopped aramid fibers have high strength and high modulus properties and can be used as a reinforcing skeleton to be evenly distributed in the coating. When the forming mesh is subjected to tensile external force, the aramid fibers can bear most of the stress and effectively prevent the generation and expansion of cracks in the coating, thereby improving the tensile properties of the forming mesh; carbon nanotubes have both excellent mechanical properties and good flexibility and can work synergistically with chopped aramid fibers. Carbon nanotubes connect different aramid fibers through bridging action, enhancing the stress transfer efficiency between fibers. When subjected to external force, carbon nanotubes can undergo energy dissipation mechanisms such as pull-out and buckling, absorbing a large amount of energy, further improving the toughness of the coating and making it The SSB forming mesh can still maintain its structural integrity under the action of complex external forces; the silaneoxy group at one end of the γ-aminopropyltriethoxysilane molecular structure can be hydrolyzed to form a silanol group, which undergoes a condensation reaction with the hydroxyl group on the surface of the chopped aramid fiber to form a strong chemical bond; the aminopropyl group at the other end can interact with the oxygen-containing functional groups or other active sites on the surface of the carbon nanotubes. γ-aminopropyltriethoxysilane builds a bridge between the chopped aramid fibers and the carbon nanotubes, enhancing the interfacial bonding between the two, allowing the two to form a synergistic toughening system in the coating, thereby improving the tensile properties and impact resistance of the SSB forming mesh.

[0021] Preferably, the toughening filler is prepared by the following steps: The chopped aramid fibers are immersed in a mixture of concentrated nitric acid and concentrated sulfuric acid, heated under reflux for reaction, cooled and washed to neutrality, dried and immersed in a γ-aminopropyltriethoxysilane solution, heated and stirred for reaction, washed and dried to obtain activated aramid fibers; Multi-walled carbon nanotubes are added to a mixed acid of concentrated nitric acid and concentrated sulfuric acid, heated under reflux for reaction, washed to neutrality after cooling, dispersed in a solvent after drying, and subjected to ultrasonication to obtain a carboxylated carbon nanotube dispersion; activated aramid fibers are immersed in the carboxylated carbon nanotube dispersion, heated and stirred for reaction, washed, and dried to obtain a toughening filler.

[0022] The toughening filler prepared according to the above steps has good dispersibility and compatibility, and can effectively improve the tensile properties of the SSB forming mesh.

[0023] Preferably, the novel high-performance SSB forming mesh is prepared by the following steps: Adding polyurethane resin and fluorocarbon modified silicone resin to xylene, adding wear-resistant reinforcing filler and toughening filler after stirring, adding defoaming agent and leveling agent after stirring and dispersing, adding isocyanate curing agent after stirring, and adjusting the viscosity with xylene to obtain a high-performance coating; The SSB forming mesh body is wiped clean and immersed in a silane coupling agent solution for treatment. After drying, a high-performance coating is applied to the surface of the SSB forming mesh body. After heating to dry the surface, the coating is cured by heating. After cooling, the coating is allowed to stand to obtain a new high-performance SSB forming mesh.

[0024] The SSB forming mesh prepared according to the above steps has good wear resistance, tensile properties and hydrophobic properties, can be quickly dehydrated, is resistant to dirt and stains, and maintains good working performance for a long time.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Polyurethane resin has good flexibility and mechanical strength, and can form a continuous and tough coating matrix. The urethane bonds in its molecular structure can effectively transfer and disperse stress, thereby improving the tensile properties of the SSB forming mesh. The fluorine atoms in the fluorocarbon-modified silicone resin have high electronegativity, and the fluorocarbon bonds formed have large bond energy and low surface energy, which can improve the hydrophobicity of the coating, reduce the adhesion and infiltration of liquids on the mesh surface, and improve the dehydration and stain resistance of the SSB forming mesh. Its silicon-oxygen bonds give the molecules flexibility, which helps to improve the flexibility of the coating and cooperate with the polyurethane resin to improve the tensile properties. The wear-resistant reinforcing filler is evenly dispersed in the coating. When subjected to friction, it can resist the cutting and scratching of external abrasive particles with its own high hardness, effectively improving the wear resistance. The toughening filler itself has high tensile strength and can play a role in strengthening the skeleton in the coating, improving the toughness of the coating. When the SSB forming mesh is subjected to external tensile force, it can better absorb energy, avoid breakage due to stress concentration, and greatly improve the tensile properties.

[0026] 2. Nano-silica has a large specific surface area and high chemical activity, providing abundant sites for subsequent chemical reactions; 3-chloropropyltrimethoxysilane can undergo hydrolysis and condensation reaction on the surface of nano-silica, and its siloxane part combines with nano-silica, with the chloropropyl group extending outward, thus achieving the initial modification of nano-silica; the introduction of octanediamine further reacts with the modified nano-silica, and the amino group and the chloropropyl group undergo substitution reaction. The long carbon chain structure of octanediamine not only increases the flexibility of the molecule, but also brings hydrophobicity to the entire hydrophobic modified chain extender; the hydrophobic modified chain extender is introduced into After being incorporated into the polyurethane molecular chain, the micro-nano size effect of nano-silica enables it to migrate to the coating surface in the polyurethane resin system and construct a micro-nano structure on the coating surface. This micro-nano structure synergizes with the long carbon chain groups with low surface energy to enhance the hydrophobicity of the SSB forming mesh, thereby improving the dehydration performance and stain resistance. The rigid nano-silica core and the flexible long carbon chain synergize to enhance the interaction between polyurethane resin molecules, improve the tensile strength and wear resistance of the resin, and enable the SSB forming mesh to withstand greater external forces during the stretching process and resist more friction losses in daily use.

[0027] 3. The silicon-oxygen bond of octamethylcyclotetrasiloxane gives the molecular chain good flexibility and chemical stability, which can improve the flexibility of the coating. When the forming mesh is subjected to external tensile force, it helps the orientation and slippage of the molecular chain segments, enhances its tensile properties, and at the same time can buffer external friction forces and improve wear resistance. The participation of methyltrimethoxysilane in the reaction can introduce methyl groups into the resin structure. The low surface energy characteristics of the methyl group initially improve the surface properties of the resin, laying the foundation for improving hydrophobicity. The trifluoropropyl group in the γ-trifluoropropyltrimethoxysilane molecule contains a strongly electronegative fluorine atom. The carbon-fluorine bond formed by fluorine atoms has low surface energy. During the synthesis of fluorocarbon-modified silicone resin, these trifluoropropyl groups are enriched on the resin surface to form a fluorocarbon layer with low surface energy. When applied to the high-performance coating of SSB forming mesh, the fluorocarbon layer reduces the free energy of the coating surface, significantly increases the contact angle of the liquid on the mesh surface, and gives the forming mesh excellent hydrophobicity, thereby improving the dehydration performance and stain resistance of the SSB forming mesh; the fluorocarbon-modified silicone resin and the polyurethane resin form an interpenetrating network structure, making the interior of the coating denser and more stable, thereby enhancing the cohesion and wear resistance of the coating. DETAILED DESCRIPTION

[0028] The present application discloses a novel high-performance SSB forming mesh. The raw materials used in the present application can be obtained from commercially available raw materials unless otherwise specified. The present application is further described in detail below in conjunction with the examples: Raw materials: Nano-silica with a particle size of 75 nm, 3-chloropropyltrimethoxysilane (CAS No.: 2530-87-2), octanediamine (CAS No.: 373-44-4), polycarbonate diol (CAS No.: 29862-10-0), isophorone diisocyanate (CAS No.: 4098-71-9), dibutyltin dilaurate (CAS No.: 77-58-7), octamethylcyclotetrasiloxane (CAS No.: 556-67-2), methyltrimethoxysilane (CAS No.: 1185-55-3), γ-trifluoropropyltrimethoxysilane (CAS No.: 429-60-7), nano The particle size of silicon carbide is 50 nm, the particle size of nano-alumina is 30 nm, the polyester hyperdispersant model is BYK-163 from Germany, the chopped aramid fiber is purchased from Zhejiang Xuantai New Materials Co., Ltd., γ-aminopropyltriethoxysilane (CAS No.: 919-30-2), the carbon nanotubes are multi-walled carbon nanotubes, model XFM25, purchased from Jiangsu Xianfeng Nanomaterial Technology Co., Ltd., N,N-dimethylformamide (CAS No.: 68-12-2), the defoamer model is BYK-066N, the leveling agent model is BYK-358N, and the isocyanate curing agent is hexamethylene diisocyanate trimer, model Desmodur N3300.

[0029] Example 1 Preparation of polyurethane resin 15 g of nano-silica was dispersed in 80 mL of 90% ethanol aqueous solution by volume, 4 g of 3-chloropropyltrimethoxysilane was added, the pH was adjusted to 4.5 using 0.1 mol / L hydrochloric acid aqueous solution, and the mixture was stirred at 200 rpm at 50° C. for 2 h. 3 g of octanediamine was added, the temperature was raised to 75° C. and the mixture was stirred at 300 rpm for 3 h. After the reaction, the mixture was cooled to below 30° C., centrifuged, washed with anhydrous ethanol, and vacuum dried at 60° C. to obtain a hydrophobically modified chain extender.

[0030] The polycarbonate diol was vacuum dehydrated at 110°C for 2 hours and cooled to below 30°C to obtain anhydrous polycarbonate diol; 80g of anhydrous polycarbonate diol was taken, heated to 60°C, 40g of isophorone diisocyanate and 0.5g of dibutyltin dilaurate were added, the temperature was raised to 80°C and stirred at 200rpm for 2 hours, the temperature was lowered to 60°C, 20g of a hydrophobically modified chain extender was added, the mixture was stirred at 60°C at 200rpm for 3 hours, and the mixture was cooled to below 30°C to obtain a polyurethane resin.

[0031] Preparation of fluorocarbon-modified silicone resin 14.29 g of octamethylcyclotetrasiloxane, 4.29 g of methyltrimethoxysilane and 1.42 g of γ-trifluoropropyltrimethoxysilane were mixed and dispersed in 50 g of toluene, stirred at 200 rpm for 30 min, 0.1 g of a 36% hydrochloric acid aqueous solution was added, and the temperature was raised to 110° C. and refluxed for 5 h. After the reaction, a 5% sodium carbonate aqueous solution was added to adjust the pH to neutral, and the mixture was distilled under reduced pressure to obtain a fluorocarbon-modified silicone resin.

[0032] Preparation of wear-resistant reinforcing fillers 15 g of nano-silicon carbide, 15 g of nano-alumina and 0.9 g of polyester hyperdispersant were mixed and dispersed in 60 mL of xylene. After ultrasonication for 30 min, shear dispersion was performed at a speed of 2000 rpm for 30 min. The xylene was removed by vacuum distillation to obtain a wear-resistant reinforcing filler.

[0033] Preparation of toughening fillers 20g of chopped aramid fiber was immersed in a mixture of concentrated nitric acid and concentrated sulfuric acid in a ratio of 1:3, with a solid-liquid ratio of 1:25 (g / mL), refluxed at 70°C for 45 minutes, cooled to below 30°C, washed with deionized water until neutral, dried, and immersed in a 5% by mass γ-aminopropyltriethoxysilane ethanol solution with a solid-liquid ratio of 1:30. The mixture was stirred at 60°C and 200rpm for 2h. After washing with deionized water, it was dried at 60°C to obtain activated aramid fiber.

[0034] 5 g of multi-walled carbon nanotubes were added to a mixed acid of concentrated nitric acid and concentrated sulfuric acid in a ratio of 1:1, refluxed at 80°C for 3 hours, cooled to below 30°C, centrifugally washed with deionized water until neutral, dried, dispersed into 250 mL of a 70% by volume N,N-dimethylformamide aqueous solution, and ultrasonicated for 30 minutes to obtain a carboxylated carbon nanotube dispersion; activated aramid fiber was immersed in the carboxylated carbon nanotube dispersion, stirred at 200 rpm at 50°C for 2 hours, centrifugally washed with deionized water, and vacuum dried at 60°C to obtain a toughening filler.

[0035] Preparation of new high-performance SSB forming mesh 40 g of polyurethane resin and 5 g of fluorocarbon modified silicone resin were added to 20 g of xylene in sequence, stirred at 2000 rpm for 15 min, 10 g of wear-resistant reinforcing filler and 5 g of toughening filler were added, dispersed at 3000 rpm for 30 min, 0.3 g of defoaming agent and 0.5 g of leveling agent were added, stirred at 1000 rpm for 10 min, 8 g of isocyanate curing agent was added, and the viscosity was adjusted to 20s with xylene to obtain a high-performance coating.

[0036] The SSB forming mesh was wiped clean with anhydrous ethanol, immersed in an ethanol solution of 5% by mass of silane coupling agent KH-550 for 10 minutes, and after drying, the high-performance coating was applied to the surface of the SSB forming mesh by roller coating. The surface was dried in an oven at 60°C for 30 minutes, transferred to a constant temperature of 80°C for curing for 2 hours, cooled and allowed to stand for 24 hours to obtain a new high-performance SSB forming mesh.

[0037] Example 2 Preparation of polyurethane resin 15 g of nano-silica was dispersed in 80 mL of 90% ethanol aqueous solution by volume, 4 g of 3-chloropropyltrimethoxysilane was added, the pH was adjusted to 4.5 using 0.1 mol / L hydrochloric acid aqueous solution, and the mixture was stirred at 200 rpm at 50° C. for 2 h. 3 g of octanediamine was added, the temperature was raised to 75° C. and the mixture was stirred at 300 rpm for 3 h. After the reaction, the mixture was cooled to below 30° C., centrifuged, washed with anhydrous ethanol, and vacuum dried at 60° C. to obtain a hydrophobically modified chain extender.

[0038] The polycarbonate diol was vacuum dehydrated at 110°C for 2 hours and cooled to below 30°C to obtain anhydrous polycarbonate diol; 80g of anhydrous polycarbonate diol was taken, heated to 60°C, 40g of isophorone diisocyanate and 0.5g of dibutyltin dilaurate were added, the temperature was raised to 80°C and stirred at 200rpm for 2 hours, the temperature was lowered to 60°C, 20g of a hydrophobically modified chain extender was added, the mixture was stirred at 60°C at 200rpm for 3 hours, and the mixture was cooled to below 30°C to obtain a polyurethane resin.

[0039] Preparation of fluorocarbon-modified silicone resin 13.33 g of octamethylcyclotetrasiloxane, 4 g of methyltrimethoxysilane and 2.67 g of γ-trifluoropropyltrimethoxysilane were mixed and dispersed in 50 g of toluene, stirred at 200 rpm for 30 min, 0.1 g of a 36% hydrochloric acid aqueous solution was added, and the temperature was raised to 110° C. and refluxed for 5 h. After the reaction, a 5% sodium carbonate aqueous solution was added to adjust the pH to neutral, and the mixture was distilled under reduced pressure to obtain a fluorocarbon-modified silicone resin.

[0040] Preparation of wear-resistant reinforcing fillers 15 g of nano-silicon carbide, 15 g of nano-alumina and 0.9 g of polyester hyperdispersant were mixed and dispersed in 60 mL of xylene. After ultrasonication for 30 min, shear dispersion was performed at a speed of 2000 rpm for 30 min. The xylene was removed by vacuum distillation to obtain a wear-resistant reinforcing filler.

[0041] Preparation of toughening fillers 20g of chopped aramid fiber was immersed in a mixture of concentrated nitric acid and concentrated sulfuric acid in a ratio of 1:3, with a solid-liquid ratio of 1:25 (g / mL), refluxed at 70°C for 45 minutes, cooled to below 30°C, washed with deionized water until neutral, dried, and immersed in a 5% by mass γ-aminopropyltriethoxysilane ethanol solution with a solid-liquid ratio of 1:30. The mixture was stirred at 60°C and 200rpm for 2h. After washing with deionized water, it was dried at 60°C to obtain activated aramid fiber.

[0042] 5 g of multi-walled carbon nanotubes were added to a mixed acid of concentrated nitric acid and concentrated sulfuric acid in a ratio of 1:1, refluxed at 80°C for 3 hours, cooled to below 30°C, centrifugally washed with deionized water until neutral, dried, dispersed into 250 mL of a 70% by volume N,N-dimethylformamide aqueous solution, and ultrasonicated for 30 minutes to obtain a carboxylated carbon nanotube dispersion; activated aramid fiber was immersed in the carboxylated carbon nanotube dispersion, stirred at 200 rpm at 50°C for 2 hours, centrifugally washed with deionized water, and vacuum dried at 60°C to obtain a toughening filler.

[0043] Preparation of new high-performance SSB forming mesh 50 g of polyurethane resin and 10 g of fluorocarbon modified silicone resin were added to 30 g of xylene in sequence, stirred at 2000 rpm for 15 min, 20 g of wear-resistant reinforcing filler and 15 g of toughening filler were added, dispersed at 3000 rpm for 30 min, 0.5 g of defoaming agent and 1 g of leveling agent were added, stirred at 1000 rpm for 10 min, 15 g of isocyanate curing agent was added, and the viscosity was adjusted to 20s with xylene to obtain a high-performance coating.

[0044] The SSB forming mesh was wiped clean with anhydrous ethanol, immersed in an ethanol solution of 5% by mass of silane coupling agent KH-550 for 10 minutes, and after drying, the high-performance coating was applied to the surface of the SSB forming mesh by roller coating. The surface was dried in an oven at 60°C for 30 minutes, transferred to a constant temperature of 80°C for curing for 2 hours, cooled and allowed to stand for 24 hours to obtain a new high-performance SSB forming mesh.

[0045] Example 3 Preparation of polyurethane resin 15 g of nano-silica was dispersed in 80 mL of 90% ethanol aqueous solution by volume, 4 g of 3-chloropropyltrimethoxysilane was added, the pH was adjusted to 4.5 using 0.1 mol / L hydrochloric acid aqueous solution, and the mixture was stirred at 200 rpm at 50° C. for 2 h. 3 g of octanediamine was added, the temperature was raised to 75° C. and the mixture was stirred at 300 rpm for 3 h. After the reaction, the mixture was cooled to below 30° C., centrifuged, washed with anhydrous ethanol, and vacuum dried at 60° C. to obtain a hydrophobically modified chain extender.

[0046] The polycarbonate diol was vacuum dehydrated at 110°C for 2 hours and cooled to below 30°C to obtain anhydrous polycarbonate diol; 80g of anhydrous polycarbonate diol was taken, heated to 60°C, 40g of isophorone diisocyanate and 0.5g of dibutyltin dilaurate were added, the temperature was raised to 80°C and stirred at 200rpm for 2 hours, the temperature was lowered to 60°C, 20g of a hydrophobically modified chain extender was added, the mixture was stirred at 60°C at 200rpm for 3 hours, and the mixture was cooled to below 30°C to obtain a polyurethane resin.

[0047] Preparation of fluorocarbon-modified silicone resin 13.79 g of octamethylcyclotetrasiloxane, 4.14 g of methyltrimethoxysilane and 2.07 g of γ-trifluoropropyltrimethoxysilane were mixed and dispersed in 50 g of toluene, stirred at 200 rpm for 30 min, 0.1 g of a 36% hydrochloric acid aqueous solution was added, and the temperature was raised to 110° C. and refluxed for 5 h. After the reaction, a 5% sodium carbonate aqueous solution was added to adjust the pH to neutral, and the mixture was distilled under reduced pressure to obtain a fluorocarbon-modified silicone resin.

[0048] Preparation of wear-resistant reinforcing fillers 15 g of nano-silicon carbide, 15 g of nano-alumina and 0.9 g of polyester hyperdispersant were mixed and dispersed in 60 mL of xylene. After ultrasonication for 30 min, shear dispersion was performed at a speed of 2000 rpm for 30 min. The xylene was removed by vacuum distillation to obtain a wear-resistant reinforcing filler.

[0049] Preparation of toughening fillers 20g of chopped aramid fiber was immersed in a mixture of concentrated nitric acid and concentrated sulfuric acid in a ratio of 1:3, with a solid-liquid ratio of 1:25 (g / mL), refluxed at 70°C for 45 minutes, cooled to below 30°C, washed with deionized water until neutral, dried, and immersed in a 5% by mass γ-aminopropyltriethoxysilane ethanol solution with a solid-liquid ratio of 1:30. The mixture was stirred at 60°C and 200rpm for 2h. After washing with deionized water, it was dried at 60°C to obtain activated aramid fiber.

[0050] 5 g of multi-walled carbon nanotubes were added to a mixed acid of concentrated nitric acid and concentrated sulfuric acid in a ratio of 1:1, refluxed at 80°C for 3 hours, cooled to below 30°C, centrifugally washed with deionized water until neutral, dried, dispersed into 250 mL of a 70% by volume N,N-dimethylformamide aqueous solution, and ultrasonicated for 30 minutes to obtain a carboxylated carbon nanotube dispersion; activated aramid fiber was immersed in the carboxylated carbon nanotube dispersion, stirred at 200 rpm at 50°C for 2 hours, centrifugally washed with deionized water, and vacuum dried at 60°C to obtain a toughening filler.

[0051] Preparation of new high-performance SSB forming mesh 45 g of polyurethane resin and 7.5 g of fluorocarbon modified silicone resin were added to 25 g of xylene in sequence, stirred at 2000 rpm for 15 min, 15 g of wear-resistant reinforcing filler and 10 g of toughening filler were added, dispersed at 3000 rpm for 30 min, 0.4 g of defoaming agent and 0.75 g of leveling agent were added, stirred at 1000 rpm for 10 min, 11.5 g of isocyanate curing agent was added, and the viscosity was adjusted to 20s with xylene to obtain a high-performance coating.

[0052] The SSB forming mesh was wiped clean with anhydrous ethanol, immersed in an ethanol solution of 5% by mass of silane coupling agent KH-550 for 10 minutes, and after drying, the high-performance coating was applied to the surface of the SSB forming mesh by roller coating. The surface was dried in an oven at 60°C for 30 minutes, transferred to a constant temperature of 80°C for curing for 2 hours, cooled and allowed to stand for 24 hours to obtain a new high-performance SSB forming mesh.

[0053] Example 4 Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is that in Example 4, the hydrophobically modified chain extender is replaced by octanediamine.

[0054] Example 5 Example 5 is based on Example 3. The only difference between Example 5 and Example 3 is that in Example 5, the amount of octamethylcyclotetrasiloxane used is 14.82 g, the amount of methyltrimethoxysilane used is 4.44 g, and the amount of γ-trifluoropropyltrimethoxysilane used is 0.74 g.

[0055] Example 6 Example 6 is based on Example 3. The only difference between Example 6 and Example 3 is that in Example 6, the amount of octamethylcyclotetrasiloxane used is 12.9 g, the amount of methyltrimethoxysilane used is 3.87 g, and the amount of γ-trifluoropropyltrimethoxysilane used is 3.23 g.

[0056] Example 7 Example 7 is based on Example 3. The only difference between Example 7 and Example 3 is that methyltrimethoxysilane is not added when preparing the fluorocarbon-modified silicone resin in Example 7.

[0057] Example 8 Example 8 is based on Example 3. The only difference between Example 8 and Example 3 is that nano-alumina is not added when preparing the wear-resistant reinforcing filler in Example 8.

[0058] Example 9 Example 9 is based on Example 3. The only difference between Example 9 and Example 3 is that in Example 9, no polyester hyperdispersant is added when preparing the wear-resistant reinforcing filler.

[0059] Example 10 Example 10 is based on Example 3. The only difference between Example 10 and Example 3 is that carbon nanotubes are not added when preparing the toughening filler in Example 10.

[0060] Example 11 Example 11 is based on Example 3. The only difference between Example 11 and Example 3 is that γ-aminopropyltriethoxysilane is not added when preparing the toughening filler in Example 11.

[0061] Comparative Example 1 Comparative Example 1 is based on Example 3. The only difference between Comparative Example 1 and Example 3 is that in Comparative Example 1, the fluorocarbon-modified silicone resin is replaced with octamethylcyclotetrasiloxane.

[0062] Comparative Example 2 Comparative Example 2 is based on Example 3. The only difference between Comparative Example 2 and Example 3 is that the wear-resistant reinforcing filler in Comparative Example 2 is replaced by nano-alumina.

[0063] Comparative Example 3 Comparative Example 3 is based on Example 3. The only difference between Comparative Example 3 and Example 3 is that in Comparative Example 3, the toughening filler is replaced by chopped aramid fibers.

[0064] Performance testing (1) GB / T 1768-2006 Paints and varnishes - Determination of abrasion resistance - Rotating rubber grinding wheel method was selected as the standard. Three samples with a size of 100 mm × 100 mm were cut from the test specimen. The abrasion test was carried out using a Taber abrasion tester with a rotation speed of 5000. The mass change of the sample before and after the test was weighed to obtain the wear amount. The average value was taken after measurement and the results were recorded in Table 1.

[0065] (2) Select "GB / T1040.3-2006 Determination of tensile properties of plastics Part 3: Test conditions for films and sheets" as the standard, cut out 5 dumbbell-shaped specimens from the sample, use an electronic universal material testing machine to perform a tensile test, calculate the tensile strength of the specimens, take the average value after measurement, and record the results in Table 1.

[0066] (3) Select "GB / T30693-2014 Measurement of contact angle of plastic film with water" as the standard, use a contact angle meter to test the water contact angle of the sample, test each sample five times, take the average value after measurement, and record the results in Table 1.

[0067] Table 1 Test results of SSB forming mesh wear resistance, tensile properties and hydrophobicity As shown in Table 1, the wear loss of Examples 1-3 is less than 0.005 g / cm 2 , the tensile strength is greater than 1125N / cm, and the contact angle is greater than 128.3°, which shows that the SSB forming mesh prepared in this application has good wear resistance, tensile properties and hydrophobic properties.

[0068] As can be seen from Table 1, the only difference between Example 4 and Example 3 is that the hydrophobically modified chain extender is replaced by octanediamine in Example 4. Compared with Example 3, the performance of Example 4 is reduced. This is because the hydrophobically modified chain extender is replaced by a common chain extender, the introduction of nano-silica is lacking, the surface lacks micro-nano structure, the surface energy increases, and the synergistic effect with other components decreases, thereby reducing the performance of the SSB forming mesh.

[0069] As can be seen from Table 1, the only difference between Examples 5, 6, and 7 and Example 3 is that the mass ratio of octamethylcyclotetrasiloxane, methyltrimethoxysilane, and γ-trifluoropropyltrimethoxysilane in Example 5 is 1:0.3:0.05, the mass ratio of octamethylcyclotetrasiloxane, methyltrimethoxysilane, and γ-trifluoropropyltrimethoxysilane in Example 6 is 1:0.3:0.25, and methyltrimethoxysilane is not added when preparing the fluorocarbon-modified silicone resin in Example 7. Compared with Example 3, the performance of Examples 5, 6, and 7 is reduced. This is because the synthesis ratio of the fluorocarbon-modified silicone resin is not within the optimal range. Too much fluorine-containing silicone monomer may cause phase separation, and too little fluorine-containing silicone monomer leads to a decrease in the number of fluorine-containing groups, affecting the hydrophobicity and wear resistance. Without the addition of methyltrimethoxysilane, the crosslinking density of the fluorocarbon-modified silicone resin is reduced, the density of the coating is affected, and the performance is reduced.

[0070] As can be seen from Table 1, the only difference between Examples 8 and 9 and Example 3 is that: in Example 8, nano-alumina is not added when preparing the wear-resistant reinforcing filler, and in Example 9, polyester-type hyperdispersant is not added when preparing the wear-resistant reinforcing filler. Compared with Example 3, the performance of Examples 8 and 9 is reduced. This is because the lack of nano-alumina or polyester-type hyperdispersant will affect the synergistic effect between the components. In the absence of nano-alumina, the gradient structure of the filler is destroyed and the wear resistance is reduced. In the absence of polyester-type hyperdispersant, the nano-filler is prone to agglomeration, resulting in stress concentration and aggravated wear, thereby reducing the performance.

[0071] As can be seen from Table 1, the only difference between Examples 10 and 11 and Example 3 is that no carbon nanotubes are added when preparing the toughening filler in Example 10, and no γ-aminopropyltriethoxysilane is added when preparing the toughening filler in Example 11. Compared with Example 3, the performance of Examples 10 and 11 is reduced. This is because without the addition of carbon nanotubes, the synergistic effect is reduced, the stress transfer efficiency between the fiber and the matrix is reduced, and the tensile strength is significantly reduced. Without the use of a silane coupling agent, the dispersibility and compatibility of the toughening filler are reduced, the interfacial bonding strength between the fiber and the resin is reduced, and the tensile properties are affected.

[0072] As can be seen from Table 1, the only difference between Comparative Example 1 and Example 3 is that the fluorocarbon-modified silicone resin is replaced with octamethylcyclotetrasiloxane in Comparative Example 1. Compared with Example 3, the performance of Comparative Example 1 is reduced. This is because the surface energy increases and the density decreases when the fluorocarbon-modified silicone resin is replaced with ordinary silicone resin, thereby significantly reducing the performance.

[0073] As can be seen from Table 1, the only difference between Comparative Example 2 and Example 3 is that the wear-resistant reinforcing filler is replaced by nano-alumina in Comparative Example 2. Compared with Example 3, the performance of Comparative Example 2 is significantly reduced; this is because the reinforcing wear-resistant filler is replaced by nano-alumina, and the use of only alumina results in insufficient hardness, poor dispersibility, decreased synergistic effect, and a significant decrease in wear resistance, tensile properties and hydrophobic properties.

[0074] As can be seen from Table 1, the only difference between Comparative Example 3 and Example 3 is that the toughening filler in Comparative Example 3 is replaced by chopped aramid fibers. Compared with Example 3, the performance of Comparative Example 3 is reduced. This is because the toughening filler is replaced by chopped aramid fibers, and there is a lack of modification treatment with carbon nanotubes and silane coupling agents. The interfacial bonding force between the chopped aramid fibers and the resin matrix is reduced, the wear resistance is reduced, the synergistic effect of the stress dispersion network is reduced, and the tensile strength is reduced, thereby reducing the performance of the SSB forming mesh.

[0075] This specific embodiment is merely an explanation of the present application and does not limit the present application. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present application. The technical scope of the present application is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A new type of high-performance SSB forming fabric, characterized by: The invention comprises an SSB forming mesh body and a high-performance coating, wherein the high-performance coating is obtained by applying a high-performance coating, and the high-performance coating comprises the following components in parts by weight: 40-50 parts polyurethane resin 5-10 parts of fluorocarbon modified silicone resin 10-20 parts of wear-resistant reinforcing filler 5-15 parts toughening filler 8-15 parts of isocyanate curing agent 20-30 parts of xylene 0.3-0.5 parts of defoaming agent 0.5-1 part of leveling agent.

2. A novel high-performance SSB forming fabric according to claim 1, characterized in that: The raw materials for preparing the polyurethane resin include polycarbonate diol, isophorone diisocyanate and a hydrophobically modified chain extender.

3. A novel high-performance SSB forming fabric according to claim 2, characterized in that: The raw materials for preparing the hydrophobically modified chain extender include nano-silicon dioxide, 3-chloropropyltrimethoxysilane and octanediamine.

4. A novel high-performance SSB forming fabric according to claim 3, characterized in that: The hydrophobically modified chain extender is prepared by the following steps: The nano-silica is dispersed in a solvent, 3-chloropropyltrimethoxysilane is added, the pH is adjusted to acidic, heating and stirring are performed, octanediamine is added, heating and stirring are performed, cooling is performed after the reaction is completed, centrifugation is performed, washing, and drying are performed to obtain a hydrophobically modified chain extender.

5. The novel high-performance SSB forming fabric according to claim 1, characterized in that: The raw materials for preparing the fluorocarbon modified organic silicone resin include octamethylcyclotetrasiloxane, methyltrimethoxysilane and gamma-trifluoropropyltrimethoxysilane.

6. A novel high-performance SSB forming fabric according to claim 5, characterized in that: The mass ratio of the octamethylcyclotetrasiloxane, methyltrimethoxysilane and γ-trifluoropropyltrimethoxysilane is 1:0.3:(0.1-0.2).

7. The novel high-performance SSB forming fabric according to claim 1, characterized in that: The raw materials for preparing the wear-resistant reinforcing filler include nano silicon carbide, nano aluminum oxide and polyester type hyperdispersant.

8. The novel high-performance SSB forming fabric according to claim 1, characterized in that: The raw materials for preparing the toughening filler include chopped aramid fibers, carbon nanotubes and gamma-aminopropyltriethoxysilane.

9. A novel high-performance SSB forming fabric according to claim 8, characterized in that: The toughening filler is prepared by the following steps: The chopped aramid fibers are immersed in a mixture of concentrated nitric acid and concentrated sulfuric acid, heated under reflux for reaction, cooled and washed to neutrality, dried and immersed in a γ-aminopropyltriethoxysilane solution, heated and stirred for reaction, washed and dried to obtain activated aramid fibers; Multi-walled carbon nanotubes are added to a mixed acid of concentrated nitric acid and concentrated sulfuric acid, heated under reflux for reaction, washed to neutrality after cooling, dispersed in a solvent after drying, and subjected to ultrasonication to obtain a carboxylated carbon nanotube dispersion; activated aramid fibers are immersed in the carboxylated carbon nanotube dispersion, heated and stirred for reaction, washed, and dried to obtain a toughening filler.

10. A novel high-performance SSB forming fabric according to any one of claims 1 to 9, characterized in that: The novel high-performance SSB forming mesh is prepared by the following steps: Adding polyurethane resin and fluorocarbon modified silicone resin to xylene, adding wear-resistant reinforcing filler and toughening filler after stirring, adding defoaming agent and leveling agent after stirring and dispersing, adding isocyanate curing agent after stirring, and adjusting the viscosity with xylene to obtain a high-performance coating; The SSB forming mesh body is wiped clean and immersed in a silane coupling agent solution for treatment. After drying, a high-performance coating is applied to the surface of the SSB forming mesh body. After heating to dry the surface, the coating is cured by heating. After cooling, the coating is allowed to stand to obtain a new high-performance SSB forming mesh.

Images