An end face anti-collision surface anti-knife cutting inflatable type pasting sleeve and a preparation method thereof

Abstract

The application discloses a gas-inflatable pasting sleeve with an end face anti-collision surface and anti-knife cutting and a preparation method thereof, relates to the technical field of pasting sleeves, and comprises a composite sleeve. The composite sleeve comprises, from inside to outside, an inner sleeve layer, a filling layer and an outer surface layer. Anti-collision rings are combined at both ends of the composite sleeve. The outer surface layer is made of the following components in parts by weight: 30-60 parts of butadiene styrene rubber, 10-30 parts of natural rubber, 30-60 parts of polyurethane, 5-20 parts of modified UHMWPE fiber, 1-3 parts of vulcanizing agent and 0.5-2 parts of accelerator TMTD. The application remarkably improves the comprehensive performance and use reliability through integrated structure design and material optimization. The multi-layer composite system combined with the end face anti-collision structure effectively absorbs high-energy impact, reduces the end face collision deformation risk, and inhibits knife scratching and fatigue cracking through the outer surface layer, thereby remarkably prolonging the service life and reducing the equipment maintenance frequency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stencil sleeve, in particular to an end face anti-collision surface knife-cut resistant air inflation type stencil sleeve and a preparation method thereof. BACKGROUND

[0002] The stencil sleeve is a key component in the flexographic printing equipment, which directly affects the printing quality and production efficiency as the carrier of the printing plate. With the rapid development of the packaging printing industry, the market demands for the quality of printed matter are continuously improved, and the performance and reliability of the stencil sleeve are particularly important. The traditional stencil sleeve mainly adopts mechanical fixing method, which is complicated to operate and takes a long time to replace, seriously affecting the production efficiency.

[0003] The emergence of the air inflation type stencil sleeve is an important breakthrough in the development of printing technology. Its working principle is to inflate the inner diameter of the sleeve through compressed air, thereby realizing the quick installation and disassembly between the sleeve and the air inflation shaft. This design not only greatly improves the plate roller replacement efficiency, but also ensures the concentricity and stability of the sleeve installation. At present, the air inflation type stencil sleeve has become a standard configuration of modern flexographic printing machines.

[0004] In terms of structural design, the early air inflation type stencil sleeve adopts a single-layer structure, mainly made of metal or glass steel and other materials. With the development of technology, it gradually evolves into a multi-layer composite structure, including an inner support layer, a middle buffer layer and an outer surface layer. This multi-layer structure design aims to meet different performance requirements: the inner layer needs to ensure sufficient strength and stability; the middle layer needs to have good shock absorption and buffering performance; and the outer layer needs to have good wear resistance, knife-cut resistance and good adhesion with the printing plate.

[0005] CN210792404U discloses an air support type stencil sleeve, which comprises a composite sleeve, the composite sleeve comprises a glass steel inner sleeve layer, an elastomer layer, a filling structure layer and an outer plate surface layer from inside to outside, and the glass steel inner sleeve layer, the elastomer layer, the filling structure layer and the outer plate surface layer are mutually composite, the two ends of the sleeve are respectively composite with a protection ring, the protection ring covers at least the elastomer layer, the filling structure layer and the composite gap between the glass steel inner sleeve layer, the elastomer layer, the filling structure layer and the outer plate surface layer, and the inner diameter of the protection ring is larger than the inner diameter of the glass steel inner sleeve layer.

[0006] However, the existing air inflation type stencil sleeve still has the following problems:

[0007] 1. Insufficient structural strength of the sleeve end face: the two ends of the sleeve are prone to collision damage during frequent installation and removal, especially at high speed, and end face deformation or damage will cause the entire sleeve to be scrapped.

[0008] 2. Insufficient surface wear resistance: the traditional surface layer material is prone to wear and tear during long-term use, affecting the service life of the sleeve and the printing precision.

[0009] 3. Interlayer bonding problem: The sleeve of the multi-layer structure is prone to interlayer separation during use, which seriously affects the product performance and service life.

[0010] 4. Poor dimensional stability: In the high-speed printing process, the sleeve is prone to vibration and deformation, affecting the printing quality.

[0011] 5. Insufficient knife cut resistance: In daily operation, the surface of the sleeve often comes into contact with various sharp tools, which can easily cause scratches and damage.

[0012] To solve these problems, the industry has been exploring new materials and process solutions. For example, using modified rubber materials to improve wear resistance, using high-performance fibers to enhance knife cut resistance, and developing new end face protection structures. However, these solutions can only solve certain problems and are difficult to achieve comprehensive performance improvement.

[0013] Therefore, it is of great practical significance and market value to develop a comprehensive performance excellent inflatable stencil sleeve that can solve various problems in the prior art and meet the development needs of the printing industry. Especially in terms of end face anti-collision and surface knife cut resistance, the improvement will directly affect the service life and practicality of the product, and is of great significance to improving the production efficiency of printing enterprises. SUMMARY

[0014] In order to solve the problems existing in the prior art, the purpose of the present application is to provide an inflatable stencil sleeve with end face anti-collision and surface knife cut resistance and a preparation method thereof. Through integrated structure design and material optimization, the comprehensive performance and use reliability are significantly improved. The multi-layer composite system combined with the end face anti-collision structure realizes effective absorption of high-energy impact, reduces the risk of end face collision deformation, and through the outer surface layer, it can significantly prolong the service life and reduce the equipment maintenance frequency, providing a high-reliability core component solution for high-speed printing scenarios.

[0015] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0016] An inflatable stencil sleeve with end face anti-collision and surface knife cut resistance, comprising a composite sleeve, the composite sleeve comprises an inner sleeve layer, a filling layer and an outer surface layer from inside to outside, the inner sleeve layer, the filling layer and the outer surface layer are mutually compounded, and the two ends of the composite sleeve are respectively compounded with anti-collision rings; the outer surface layer is made of the following components in parts by weight: styrene-butadiene rubber 30-60 parts, natural rubber 10-30 parts, polyurethane 30-60 parts, modified UHMWPE fiber 5-20 parts, vulcanizing agent 1-3 parts, and accelerator TMTD 0.5-2 parts.

[0017] Preferably, the thickness of the inner sleeve layer is 0.8-3.0 mm.

[0018] Preferably, the thickness of the outer surface layer is 0.2-5.0 mm.

[0019] Preferably, the anti-collision ring covers at least the composite gap between the inner sleeve layer, the filling layer and the outer surface layer, and the inner diameter of the anti-collision ring is greater than the inner diameter of the inner sleeve layer.

[0020] Preferably, the filling layer is made of aluminum honeycomb plate and / or polypropylene honeycomb plate.

[0021] Preferably, the preparation method of the modified UHMWPE fiber comprises the following steps:

[0022] (1) placing the UHMWPE fiber in an argon atmosphere and treating it by plasma to obtain an activated fiber; immersing the activated fiber in an ethanol aqueous solution, then adding chloropropyl triethoxysilane, adjusting the pH of the system, oscillating the reaction, filtering, washing and drying the product to obtain a chlorinated fiber;

[0023] Chloropropyl surface grafting: argon plasma bombardment initiates chain scission on the surface of UHMWPE, generates free radicals and introduces oxygen-containing polar groups (-OH) to form activated sites. In the ethanol / water system, chloropropyl triethoxysilane is hydrolyzed to silanol (Si-OH), which forms Si-O-Si bonds with the hydroxyl groups on the surface of the fiber through condensation reaction (dehydration), thereby covalently grafting the terminal chloropropyl group (-CH2CH2CH2Cl) to the surface of the fiber, and completing the chlorination modification.

[0024] Preferably, in step (1), the UHMWPE fiber has a molecular weight of more than 1 million.

[0025] Preferably, in step (1), the plasma treatment conditions are 5-15 kV, a frequency of 50 kHz, a vacuum degree of 400-600 Pa, and a treatment time of 10-20 min.

[0026] Preferably, in step (1), the volume ratio of ethanol to water in the ethanol aqueous solution is 8-10:1; and the amount ratio of the activated fiber, the ethanol aqueous solution and chloropropyl triethoxysilane is 10 g:150-200 mL:0.5-4 g.

[0027] Preferably, in step (1), the pH of the system is adjusted to 4-5 with acetic acid, and the oscillation reaction conditions are oscillation at 45-60°C for 3-6 h; and the product is washed with ethanol and deionized water for 3-5 times in sequence.

[0028] (2) adding the chlorinated fiber, tetrafluorobutandiol and potassium carbonate into DMF, and reacting under a nitrogen atmosphere while heating, then filtering, alcohol-washing and drying the product to obtain a fluorinated fiber.

[0029] Fluorinated chain replacement reaction: the Cl atom at the end of chloropropyl on the surface of chlorinated fiber is replaced by the hydroxyl of tetrafluorobutanediol through SN2 nucleophilic substitution reaction in DMF, realizing the directional introduction of fluorocarbon chain (-O-CF2CF2CF2CF2-OH). Potassium carbonate provides an alkaline environment to activate the hydroxyl group as a strong nucleophile (-O - ), while neutralizing the generated HCl to avoid side reactions, and finally forming a fiber surface rich in fluorocarbon structure.

[0030] Preferably, in step (2), the amount ratio of chlorinated fiber, tetrafluorobutanediol, potassium carbonate, and DMF is 10g:8-16g:3-6g:100-150mL.

[0031] Preferably, in step (2), the heating reaction conditions are heating to 65-80℃, stirring at 200-400r / min for 8-16h.

[0032] (3) The fluorinated fiber is immersed in dichloromethane, 2,4-pentadienoic acid, DCC, and DMAP are added in sequence, and the product is filtered, washed, and dried to obtain modified UHMWPE fiber.

[0033] Olefin functional group esterification anchoring: the residual hydroxyl group on the surface of the fluorinated fiber and the carboxylic acid group of 2,4-pentadienoic acid undergo condensation esterification under the catalysis of DCC / DMAP. Light-proof conditions prevent unintended polymerization of conjugated double bonds (C=C) under free radical or photolysis conditions, ensuring the stability of the modified structure.

[0034] Preferably, in step (3), the amount ratio of fluorinated fiber, dichloromethane, 2,4-pentadienoic acid, DCC, and DMAP is 10g:100-150mL:8-12g:8-12g:0.8-1.2g.

[0035] Preferably, in step (3), the light-proof reaction conditions are 20-35℃, 200-400r / min light-proof stirring reaction for 6-10h; the product is washed with tetrahydrofuran and acetone 2-3 times in sequence.

[0036] The application also claims a preparation method of the end-face anti-collision surface anti-knife-cutting inflatable plate sticking sleeve, comprising the following steps: winding an inner sleeve layer on a mandrel mold, determining the thickness of a filling layer according to the outer diameter size of the plate sticking sleeve, wrapping a filling material on the outer surface of the inner sleeve layer to obtain the filling layer; adding styrene-butadiene rubber, natural rubber, polyurethane, modified UHMWPE fiber, vulcanizing agent and accelerator TMTD into a mixer for mixing and stirring at 400-600 r / min and 40-60 DEG C for 2-10 min to obtain a mixture, melting and extruding granulation in a twin-screw extruder at 200-270 DEG C, and vulcanizing and forming at 3-5 MPa and 120-150 DEG C for 6-10 min to obtain an outer surface layer; compounding the outer surface layer on the outer surface of the filling layer, grinding and polishing to reach the designed outer diameter size to obtain a composite sleeve, and installing anti-collision rings at both ends of the composite sleeve to obtain the end-face anti-collision surface anti-knife-cutting inflatable plate sticking sleeve.

[0037] Compared with the prior art, the application has the following beneficial effects:

[0038] 1. The end-face anti-collision surface anti-knife-cutting inflatable plate sticking sleeve provided by the application has the synergistic effect of the inner sleeve layer, the filling layer and the outer surface layer, which effectively disperses mechanical stress, and the anti-collision rings at both ends further absorb collision energy, so that the impact resistance and the knife-cutting resistance are strengthened through the multi-layer composite structure. In the outer surface layer, the styrene-butadiene rubber gives the material high elasticity and fatigue resistance, the natural rubber supplements flexibility and wear resistance, the polyurethane enhances the oil stain resistance and the chemical solvent corrosion resistance, and the modified UHMWPE fiber improves the surface tear resistance and the cutting threshold through a high-strength network structure. The vulcanizing system promotes the close combination of the components, and forms a surface layer with a rigid-elastic balance, which maintains the structural stability and durability under the high-frequency pressure impact of the printing machinery.

[0039] 2. The modified UHMWPE fiber provided by the application has a multiple reinforcement mechanism through surface functionalization: the silane coupling treatment introduces chloropropyl active groups on the surface of the fiber, which enhances the interfacial bonding strength with the rubber matrix; the fluorination modification significantly reduces the friction coefficient of the fiber surface by introducing fluorocarbon chains, reduces the kinetic energy transmission and surface damage when the knife is moved, and the high stability of the C-F bond gives the material the ability of anti-ultraviolet aging, chemical medium corrosion resistance and hydrophobicity, effectively inhibiting the damage of the interface combination in a humid environment; the olefin grafted pentadiene structure is similar to the carbon skeleton of the rubber molecular chain, and the interfacial repulsion is reduced through structural compatibility, and the conjugated double bond of the olefin grafted pentadiene structure is covalently bonded with the sulfur crosslinking network in the rubber vulcanization process, so that the fiber and the matrix form chemical anchoring points. This three-dimensional interpenetrating network structure physically shields and blocks the crack propagation path, and improves the tear resistance by means of the strong interfacial force of the chemical bond, ensuring the long-term service performance of the sleeve under complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some schematic diagrams of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. Other related drawings can also be obtained by those skilled in the art without any creative effort on the basis of the drawings.

[0041] Figure 1 The structure diagram of the air inflation type version sleeve provided by the present application is shown in the figure.

[0042] In the figure, 1, inner sleeve layer; 2, filling layer; 3, outer version surface layer; 4, anti-collision ring. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail in combination with the embodiments. Of course, the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0044] Unless otherwise specified, the chemical reagents and materials in the present application are purchased through market channels or synthesized by raw materials purchased through market channels.

[0045] The UHMWPE fiber is purchased from Sinopec Yizheng Chemical Fibre Co., Ltd., and the model is white sterlylon.

[0046] An air inflation type version sleeve with end face anti-collision surface and anti-knife cutting function comprises a composite sleeve, which comprises an inner sleeve layer 1, a filling layer 2 and an outer version surface layer 3 from inside to outside, and the inner sleeve layer 1, the filling layer 2 and the outer version surface layer 3 are mutually combined. Anti-collision rings 4 are combined at both ends of the composite sleeve. The anti-collision rings cover at least the combined gap between the inner sleeve layer, the filling layer and the outer version surface layer, and the inner diameter of the anti-collision ring is larger than the inner diameter of the inner sleeve layer.

[0047] The inner sleeve layer is made of glass fiber and / or glass steel, and the thickness is 0.8-3.0 mm; the filling layer is made of aluminum honeycomb plate and / or polypropylene honeycomb plate; and the thickness of the outer version surface layer is 0.2-5.0 mm.

[0048] A preparation method of an air inflation type version sleeve with end face anti-collision surface and anti-knife cutting function comprises the following steps:

[0049] (1) UHMWPE fiber is placed in an argon atmosphere, and is subjected to plasma treatment at 5-15 kV, a frequency of 50 kHz, and a vacuum degree of 400-600 Pa for 10-20 min to obtain an activated fiber; 10 g of the activated fiber is immersed in 150-200 mL of an ethanol aqueous solution (the volume ratio of ethanol to water is 8-10:1), then 0.5-4 g of chloropropyl triethoxysilane is added, the pH of the system is adjusted to 4-5 with acetic acid, and oscillation reaction is carried out at 45-60 °C for 3-6 h; the product is filtered, washed with ethanol and deionized water for 3-5 times in sequence, and dried to obtain a chlorinated fiber;

[0050] (2) 10 g of the chlorinated fiber, 8-16 g of tetrafluorobutylene glycol, and 3-6 g of potassium carbonate are added to 100-150 mL of DMF, and reaction is carried out at 65-80 °C under a nitrogen atmosphere and with stirring at 200-400 r / min for 8-16 h; the product is filtered, alcohol-washed, and dried to obtain a fluorinated fiber.

[0051] (3) 10 g of the fluorinated fiber is immersed in 100-150 mL of dichloromethane, 8-12 g of 2,4-pentadienoic acid, 8-12 g of DCC, and 0.8-1.2 g of DMAP are added in sequence, and reaction is carried out at 20-35 °C under light-shielded stirring at 200-400 r / min for 6-10 h; the product is filtered, washed with tetrahydrofuran and acetone for 2-3 times in sequence, and dried to obtain a modified UHMWPE fiber;

[0052] (4) an inner sleeve layer 1 is wound on a mandrel mold, the thickness of a filling layer 2 is determined according to the outer diameter size of the version sleeve, and a filling material is wrapped on the outer surface of the inner sleeve layer 1 to obtain the filling layer 2; 300-600 g of styrene butadiene rubber, 100-300 g of natural rubber, 300-600 g of polyurethane, 50-200 g of the modified UHMWPE fiber, 10-30 g of a vulcanizing agent, and 5-20 g of an accelerator TMTD are added to a mixer, mixed and stirred at 400-600 r / min and 40-60 °C for 2-10 min to obtain a mixed material, the mixed material is melt-extruded and granulated in a twin-screw extruder at 200-270 °C, and vulcanization molding is carried out at 3-5 MPa and 120-150 °C for 6-10 min to obtain an outer version layer; the outer version layer 3 is compounded on the outer surface of the filling layer 2, and grinding and polishing are carried out to reach the designed outer diameter size to obtain a composite sleeve, and an anti-collision ring 4 is installed at both ends of the composite sleeve to obtain the air-inflatable version sleeve with the end face anti-collision surface and the anti-knife-cutting function.

[0053] The application will be further described below through specific examples.

[0054] Application Example 1

[0055] The application discloses a gas-inflatable version pasting sleeve with end face anti-collision surface and anti-knife cutting, which comprises a composite sleeve, wherein the composite sleeve comprises, from inside to outside, an inner sleeve layer 1, a filling layer 2 and an outer surface layer 3, the inner sleeve layer 1, the filling layer 2 and the outer surface layer 3 are mutually combined, and anti-collision rings 4 are combined at two ends of the composite sleeve respectively; the anti-collision rings cover the combined gaps between the inner sleeve layer, the filling layer and the outer surface layer, and the inner diameter of the anti-collision rings is larger than the inner diameter of the inner sleeve layer.

[0056] The inner sleeve layer is formed by fully immersing UHMWPE fibers in a carboxyl styrene butadiene rubber emulsion, winding the UHMWPE fibers on a mandrel, and drying and vulcanizing to form the inner sleeve layer with a thickness of 2.2 mm; the filling layer is made of aluminum honeycomb plates; and the thickness of the outer surface layer is 3.5 mm.

[0057] Embodiment 1

[0058] A preparation method of the gas-inflatable version pasting sleeve with end face anti-collision surface and anti-knife cutting, comprising the following steps:

[0059] (1) UHMWPE fibers are placed in an argon atmosphere, and are subjected to plasma treatment under the conditions of 10 kV, a frequency of 50 kHz and a vacuum degree of 500 Pa for 15 min to obtain activated fibers; 10 g of the activated fibers are immersed in 200 mL of an ethanol aqueous solution (the volume ratio of ethanol to water is 9:1), then 4 g of chloropropyl triethoxysilane is added, the pH of the system is adjusted to 4.5 by using acetic acid, and oscillation reaction is carried out at 60 DEG C for 3 h; the product is filtered, washed with ethanol and deionized water in sequence for 4 times, and dried to obtain chlorinated fibers;

[0060] (2) 10 g of the chlorinated fibers, 16 g of tetrafluorobutylene glycol and 6 g of potassium carbonate are added into 120 mL of DMF, and reaction is carried out at 80 DEG C under the condition of nitrogen atmosphere and stirring at 300 r / min for 8 h; the product is filtered, alcohol-washed and dried to obtain fluorinated fibers.

[0061] (3) 10 g of the fluorinated fibers are immersed in 120 mL of dichloromethane, 12 g of 2,4-pentadienoic acid, 12 g of DCC and 1.2 g of DMAP are added in sequence, and reaction is carried out at 35 DEG C under the condition of light-shielding stirring at 300 r / min for 6 h; the product is filtered, washed with tetrahydrofuran and acetone in sequence for 2 times, and dried to obtain modified UHMWPE fibers;

[0062] (4) winding the inner sleeve layer on the mandrel mold, determining the thickness of the filling layer according to the outer diameter size of the lining sleeve, wrapping the filling material on the outer surface of the inner sleeve layer to obtain the filling layer; adding 600g of styrene-butadiene rubber, 300g of natural rubber, 600g of polyurethane, 200g of modified UHMWPE fiber, 30g of vulcanizing agent and 20g of accelerator TMTD into a mixer for mixing and stirring at 500r / min and 50℃ for 6min to obtain a mixture, melting and extruding the mixture into granules in a twin-screw extruder at 250℃, and vulcanizing and forming the mixture at 4MPa and 130℃ for 8min to obtain the outer lining layer; compounding the outer lining layer on the outer surface of the filling layer, grinding and polishing the same to reach the designed outer diameter size to obtain the composite sleeve, and installing the anti-collision ring at both ends of the composite sleeve to obtain the air inflation type lining sleeve with the end surface anti-collision surface and the anti-knife cutting function.

[0063] Example 2

[0064] A preparation method of an air inflation type lining sleeve with an end surface anti-collision surface and an anti-knife cutting function, comprising the following steps:

[0065] (1) placing UHMWPE fiber in an argon atmosphere, and carrying out plasma treatment at 10kV, a frequency of 50kHz and a vacuum degree of 500Pa for 15min to obtain activated fiber; immersing 10g of the activated fiber into 200mL of an ethanol aqueous solution (the volume ratio of ethanol to water is 9:1), then adding 3g of chloropropyl triethoxysilane, adjusting the pH of the system to 4.5 with acetic acid, and oscillating the system at 55℃ for 4h; filtering the product, washing it with ethanol and deionized water for 4 times in sequence, and drying to obtain chlorinated fiber;

[0066] (2) adding 10g of the chlorinated fiber, 12g of tetrafluorobutylene glycol and 5g of potassium carbonate into 120mL of DMF, stirring at 300r / min under a nitrogen atmosphere, and heating to 75℃ for 10h; filtering the product, washing it with alcohol, and drying to obtain fluorinated fiber.

[0067] (3) immersing 10g of the fluorinated fiber into 120mL of dichloromethane, and adding 10g of 2,4-pentadienoic acid, 10g of DCC and 1.0g of DMAP in sequence, stirring at 300r / min under light shielding at 30℃ for 7h; filtering the product, washing it with tetrahydrofuran and acetone for 2 times in sequence, and drying to obtain modified UHMWPE fiber;

[0068] (4) winding the inner sleeve layer on the mandrel mold, determining the thickness of the filling layer according to the outer diameter size of the lining sleeve, wrapping the filling material on the outer surface of the inner sleeve layer to obtain the filling layer; adding 500g of styrene-butadiene rubber, 250g of natural rubber, 500g of polyurethane, 150g of modified UHMWPE fiber, 25g of vulcanizing agent and 15g of accelerator TMTD into a mixer for mixing and stirring at 500r / min and 50℃ for 6min to obtain a mixture, melting and extruding the mixture into granules in a twin-screw extruder at 250℃, and vulcanizing and forming the mixture at 4MPa and 130℃ for 8min to obtain the outer lining layer; compounding the outer lining layer on the outer surface of the filling layer, grinding and polishing the same to reach the designed outer diameter size to obtain the composite sleeve, and installing the anti-collision ring at both ends of the composite sleeve to obtain the air inflation type lining sleeve with the end surface anti-collision surface and the anti-knife cutting function.

[0069] Example 3

[0070] A preparation method of an air inflation type lining sleeve with an end surface anti-collision surface and an anti-knife cutting function, comprising the following steps:

[0071] (1) placing UHMWPE fiber in an argon atmosphere, and carrying out plasma treatment at 10kV, a frequency of 50kHz and a vacuum degree of 500Pa for 15min to obtain activated fiber; immersing 10g of the activated fiber into 200mL of an ethanol aqueous solution (the volume ratio of ethanol to water is 9:1), then adding 2g of chloropropyl triethoxysilane, adjusting the pH of the system to 4.5 with acetic acid, and oscillating the system at 50℃ for 5h; filtering the product, washing it with ethanol and deionized water for 4 times in sequence, and drying to obtain chlorinated fiber;

[0072] (2) adding 10g of chlorinated fiber, 10g of tetrafluorobutylene glycol and 4g of potassium carbonate into 120mL of DMF, stirring at 300r / min under a nitrogen atmosphere, and heating to 70℃ for 10h; filtering the product, washing it with alcohol, and drying to obtain fluorinated fiber.

[0073] (3) immersing 10g of fluorinated fiber into 120mL of dichloromethane, and adding 10g of 2,4-pentadienoic acid, 10g of DCC and 1.0g of DMAP in sequence, and stirring at 25℃ and 300r / min in the dark for 8h; filtering the product, washing it with tetrahydrofuran and acetone for 2 times in sequence, and drying to obtain modified UHMWPE fiber;

[0074] (4) winding the inner sleeve layer on the mandrel mold, determining the thickness of the filling layer according to the outer diameter size of the lining sleeve, wrapping the filling material on the outer surface of the inner sleeve layer to obtain the filling layer; adding 400g of styrene-butadiene rubber, 150g of natural rubber, 400g of polyurethane, 100g of modified UHMWPE fiber, 15g of vulcanizing agent and 15g of accelerator TMTD into a mixer for mixing and stirring at 500r / min and 50℃ for 6min to obtain a mixture, melting and extruding the mixture into granules in a twin-screw extruder at 250℃, and vulcanizing and forming the mixture at 4MPa and 130℃ for 8min to obtain the outer lining layer; compounding the outer lining layer on the outer surface of the filling layer, grinding and polishing the same to reach the designed outer diameter size to obtain the composite sleeve, and installing the anti-collision ring at both ends of the composite sleeve to obtain the air inflation type lining sleeve with the end surface anti-collision surface and the anti-knife cutting function.

[0075] Example 4

[0076] A preparation method of an air inflation type lining sleeve with an end surface anti-collision surface and an anti-knife cutting function, comprising the following steps:

[0077] (1) placing UHMWPE fiber in an argon atmosphere, and carrying out plasma treatment at 10kV, a frequency of 50kHz and a vacuum degree of 500Pa for 15min to obtain activated fiber; immersing 10g of the activated fiber into 200mL of an ethanol aqueous solution (the volume ratio of ethanol to water is 9:1), then adding 0.5g of chloropropyl triethoxysilane, adjusting the pH of the system to 4.5 with acetic acid, and oscillating the system at 45℃ for 6h; filtering the product, washing it with ethanol and deionized water for 4 times in sequence, and drying to obtain chlorinated fiber;

[0078] (2) adding 10g of the chlorinated fiber, 8g of tetrafluorobutylene glycol and 3g of potassium carbonate into 120mL of DMF, stirring at 300r / min under a nitrogen atmosphere, and heating to 65℃ for 16h; filtering the product, washing it with alcohol, and drying to obtain fluorinated fiber.

[0079] (3) immersing 10g of the fluorinated fiber into 120mL of dichloromethane, and adding 8g of 2,4-pentadienoic acid, 8g of DCC and 0.8g of DMAP in sequence, stirring at 20℃ and 300r / min in the dark for 10h; filtering the product, washing it with tetrahydrofuran and acetone for 2 times in sequence, and drying to obtain modified UHMWPE fiber;

[0080] (4) winding the inner sleeve layer on the mandrel mold, determining the thickness of the filling layer according to the outer diameter size of the lining sleeve, wrapping the filling material on the outer surface of the inner sleeve layer to obtain the filling layer; adding 300g of styrene-butadiene rubber, 100g of natural rubber, 300g of polyurethane, 50g of modified UHMWPE fiber, 10g of vulcanizing agent and 5g of accelerator TMTD into a mixer for mixing and stirring at 500r / min and 50℃ for 6min to obtain a mixture, adding the mixture into a twin-screw extruder for melt extrusion and granulation at 250℃, and vulcanizing and forming at 4MPa and 130℃ for 8min to obtain the outer surface layer; compounding the outer surface layer on the outer surface of the filling layer, grinding and polishing it to reach the designed outer diameter size to obtain the composite sleeve, and installing the anti-collision ring at both ends of the composite sleeve to obtain the end face anti-collision surface anti-knife cutting gas expansion type lining sleeve.

[0081] Comparative Example 1

[0082] A preparation method of an end face anti-collision surface anti-knife cutting gas expansion type lining sleeve, comprising the following steps:

[0083] (1) placing UHMWPE fiber in an argon atmosphere, and carrying out plasma treatment at 10kV, a frequency of 50kHz and a vacuum degree of 500Pa for 15min to obtain activated fiber; immersing 10g of the activated fiber into 200mL of an ethanol aqueous solution (the volume ratio of ethanol to water is 9:1), then adding 4g of chloropropyl triethoxysilane, adjusting the pH of the system to 4.5 with acetic acid, and oscillating the system at 60℃ for 3h; filtering the product, and washing it with ethanol and deionized water for 4 times in sequence, and drying to obtain chlorinated fiber;

[0084] (2) adding 10g of chlorinated fiber, 16g of tetrafluorobutylene glycol and 6g of potassium carbonate into 120mL of DMF, stirring at 300r / min at 80℃ under a nitrogen atmosphere for 8h, filtering the product, alcohol washing and drying to obtain fluorinated fiber.

[0085] (3) winding the inner sleeve layer on the mandrel mold, determining the thickness of the filling layer according to the outer diameter size of the lining sleeve, wrapping the filling material on the outer surface of the inner sleeve layer to obtain the filling layer; adding 600g of styrene-butadiene rubber, 300g of natural rubber, 600g of polyurethane, 200g of fluorinated fiber, 30g of vulcanizing agent and 20g of accelerator TMTD into a mixer for mixing and stirring at 500r / min and 50℃ for 6min to obtain a mixture, adding the mixture into a twin-screw extruder for melt extrusion and granulation at 250℃, and vulcanizing and forming at 4MPa and 130℃ for 8min to obtain the outer surface layer; compounding the outer surface layer on the outer surface of the filling layer, grinding and polishing it to reach the designed outer diameter size to obtain the composite sleeve, and installing the anti-collision ring at both ends of the composite sleeve to obtain the end face anti-collision surface anti-knife cutting gas expansion type lining sleeve.

[0086] Comparative Example 2

[0087] A preparation method of the end face anti-collision surface anti-knife cutting inflatable type pasting sleeve, comprising the following steps:

[0088] (1) The UHMWPE fiber was placed in an argon atmosphere and subjected to plasma treatment for 15 min under the conditions of 10 kV, a frequency of 50 kHz, and a vacuum degree of 500 Pa to obtain an activated fiber; 10 g of the activated fiber was immersed in 200 mL of an ethanol aqueous solution (the volume ratio of ethanol to water was 9:1), then 4 g of chloropropyl triethoxysilane was added, the pH of the system was adjusted to 4.5 with acetic acid, and the product was oscillated at 60℃ for 3 h; the product was filtered and washed with ethanol and deionized water four times in sequence, and dried to obtain chlorinated fiber;

[0089] (2) The inner sleeve layer was wound on the mandrel mold, the thickness of the filling layer was determined according to the outer diameter size of the pasting sleeve, and the filling material was wrapped on the outer surface of the inner sleeve layer to obtain the filling layer; 600 g of styrene-butadiene rubber, 300 g of natural rubber, 600 g of polyurethane, 200 g of chlorinated fiber, 30 g of vulcanizing agent, and 20 g of accelerator TMTD were added to a mixer and mixed and stirred at 500 r / min and 50℃ for 6 min to obtain a mixture, which was then added to a twin-screw extruder and melt-extruded and granulated at 250℃, and vulcanized and formed at 4 MPa and 130℃ for 8 min to obtain the outer surface layer; the outer surface layer was compounded on the outer surface of the filling layer, and the composite sleeve was ground and polished to the designed outer diameter size to obtain the composite sleeve, and the anti-collision ring was installed at both ends of the composite sleeve to obtain the end face anti-collision surface anti-knife cutting inflatable type pasting sleeve.

[0090] The outer surface layer prepared in Examples 1-4 and Comparative Examples 1-2 was tested for performance, the water contact angle thereof was tested according to GB / T 30693-2014 "Measurement of the contact angle of plastics with water", the Shore hardness thereof was tested according to GB / T 531.1-2008 "Vulcanized or thermoplastic rubber-Test methods for indentation hardness-Part 1: Durometer method (Shore hardness)", the wear resistance thereof was tested according to GB / T 1689-2014 "Determination of the abrasion resistance of vulcanized rubber (using an Akron abrasion tester)", the tensile strength and elongation at break thereof were tested according to GB / T 528-2009 "Determination of the tensile stress-strain properties of vulcanized or thermoplastic rubber", and the tear strength thereof was tested according to GB / T 529-2008 "Determination of the tear strength of vulcanized or thermoplastic rubber (trouser, right-angle and crescent shaped test pieces)"; the tensile strength, elongation at break, and tear strength of the outer surface layer were tested again after 300 h of continuous radiation aging under a 40 W ultraviolet lamp with a wavelength of 315-400 nm. The specific data are shown in Table 1.

[0091] Table 1 Performance test results of the outer surface layer

[0092]

[0093] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent substitutions or changes according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A pneumatic mounting sleeve with anti-collision end face and anti-cut surface, comprising a composite sleeve, wherein the composite sleeve comprises, from the inside to the outside, an inner sleeve layer (1), a filling layer (2), and an outer plate surface layer (3), wherein the inner sleeve layer (1), the filling layer (2), and the outer plate surface layer (3) are compositely combined, characterized in that, The composite sleeve is reinforced with anti-collision rings (4) at both ends; the outer panel layer (3) is made of the following components by weight: 30-60 parts of styrene-butadiene rubber, 10-30 parts of natural rubber, 30-60 parts of polyurethane, 5-20 parts of modified UHMWPE fiber, 1-3 parts of vulcanizing agent, and 0.5-2 parts of accelerator TMTD; The method for preparing the modified UHMWPE fiber includes the following steps: (1) The UHMWPE fiber was placed in an argon atmosphere and subjected to plasma treatment to obtain activated fiber; the activated fiber was immersed in an ethanol aqueous solution, and then chloropropyltriethoxysilane was added to adjust the pH of the system. The reaction was shaken, and the product was filtered, washed, and dried to obtain chlorinated fiber. (2) Add chlorinated fiber, tetrafluorobutanediol and potassium carbonate to DMF, heat and react under nitrogen atmosphere, filter, wash with alcohol and dry the product to obtain fluorinated fiber; (3) Immerse the fluorinated fiber in dichloromethane, add 2,4-pentadienoic acid, DCC and DMAP in sequence, react in the dark, filter, wash and dry the product to obtain modified UHMWPE fiber.

2. The air-expanding mounting sleeve with anti-collision end face and anti-cut surface as described in claim 1, characterized in that, In step (1), the plasma treatment conditions are 5-15kV, 50kHz frequency, and 400-600Pa vacuum for 10-20min.

3. The air-expanding mounting sleeve with anti-collision end face and anti-cut surface as described in claim 1, characterized in that, In step (1), the volume ratio of ethanol to water in the ethanol-water solution is 8-10:1; the ratio of activated fiber, ethanol-water solution, and chloropropyltriethoxysilane is 10g:150-200mL:0.5-4g.

4. The air-expanding mounting sleeve with anti-collision end face and anti-cut surface as described in claim 1, characterized in that, In step (1), the pH of the system is adjusted to 4-5 with acetic acid, and the shaking reaction is carried out at 45-60℃ for 3-6 hours. The product is washed with ethanol and deionized water 3-5 times in sequence.

5. The air-expanding mounting sleeve with anti-collision and anti-cutting surface as described in claim 1, characterized in that, In step (2), the ratio of chlorinated cellulose, tetrafluorobutanediol, potassium carbonate and DMF is 10g: 8-16g: 3-6g: 100-150mL.

6. The air-expanding mounting sleeve with anti-collision end face and anti-cut surface as described in claim 1, characterized in that, In step (2), the reaction conditions are to heat to 65-80℃ and stir at 200-400r / min for 8-16h.

7. The air-expanding mounting sleeve with anti-collision and anti-cut surface as described in claim 1, characterized in that, In step (3), the ratio of fluorinated fiber, dichloromethane, 2,4-pentadienoic acid, DCC, and DMAP is 10g: 100-150mL: 8-12g: 8-12g: 0.8-1.2g.

8. The air-expanding mounting sleeve with anti-collision and anti-cutting surface as described in claim 1, characterized in that, In step (3), the reaction conditions are 20-35℃, 200-400r / min, and stirring in the dark for 6-10 hours; the product is washed 2-3 times with tetrahydrofuran and acetone in sequence.

9. A method for preparing an air-expanding mounting sleeve with an anti-collision end face and anti-cut surface as described in any one of claims 1 to 8, characterized in that, The process includes the following steps: winding an inner sleeve (1) on a mandrel mold; determining the thickness of the filling layer (2) according to the outer diameter of the mounting sleeve; wrapping the filling material around the outer surface of the inner sleeve (1) to obtain the filling layer (2); adding styrene-butadiene rubber, natural rubber, polyurethane, modified UHMWPE fiber, vulcanizing agent, and accelerator TMTD into a mixer at 400-600 r / min and 40-60℃ for 2-10 min to obtain a mixture; adding it to a twin-screw extruder at 200-270℃ for melt extrusion granulation; and vulcanizing it at 3-5 MPa and 120-150℃ for 6-10 min to obtain the outer plate surface layer; bonding the outer plate surface layer (3) to the outer surface of the filling layer (2); grinding and polishing it to achieve the designed outer diameter to obtain a composite sleeve; and installing anti-collision rings (4) at both ends of the composite sleeve to obtain the air-expanding mounting sleeve with anti-collision and anti-cutting end face.

Images