A nano-glass fiber polymer high-strength wear-resistant roller

Abstract

The present invention discloses a nano-glass fiber polymer high-strength wear-resistant roller, belonging to the technical field of roller preparation for material conveying. The process comprises the following steps: titanium dioxide-modified nano-carbon tubes, glass fiber, nylon, an antioxidant, and a plasticizer are added to a twin-screw extruder in a weight ratio of 8-14:31-35:84-90:0.5-1.2:0.6-1, followed by mixing treatments at 230-240°C for 80-100 seconds, 260-270°C for 120-180 seconds, and 220-230°C for 5-8 minutes. The roller is then poured into a mold and hot-pressed at 180-190°C and 2-3MPa for 3-4 minutes to obtain the wear-resistant roller. By blending the modified titanium dioxide-modified nano-carbon tubes, glass fiber, and nylon, the wear-resistant roller has excellent strength, wear resistance, and antibacterial properties.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of rollers for material conveying, and in particular relates to a nano-glass fiber polymer high-strength wear-resistant roller. Background Art

[0002] Belt conveyor is a kind of conveying mechanical equipment commonly used in engineering and is one of the important components of belt conveyor. The function of roller is to support the conveyor belt, reduce the running resistance, and make the sag of the conveyor belt not exceed a certain limit to ensure the smooth operation of the conveyor belt. The application of rollers is not limited to traditional industrial fields such as ore transportation and building materials transportation, but also plays an important role in medical equipment. (1) Pharmaceutical production line: In the pharmaceutical production process, rollers are widely used in conveyor belt systems to transport various pharmaceutical raw materials, semi-finished products and finished products. For example, in the production line of a pharmaceutical factory, rollers can effectively transport drugs from one process to the next, improve production efficiency and reduce labor costs. (2) Packaging equipment: In the food or pharmaceutical packaging process, rollers also play an important role. Modern packaging equipment usually adopts an automated conveying system. Rollers are used to support and guide the movement of packaging materials to ensure the smooth progress of the packaging process. With the assistance of rollers, packaging equipment can achieve high-speed and high-precision packaging operations. There are many types of rollers used in the market, including various trough rollers, buffer rollers, parallel rollers, etc. Currently, idlers are primarily made of steel, ceramic, and plastic. Steel idlers have poor wear resistance, and the resulting burrs can easily damage the belt. Furthermore, they are prone to rust and sticking, significantly complicating equipment management and maintenance. Ceramic idlers offer advantages such as wear resistance, oxidation resistance, and resistance to sticking, but their heavy weight, poor toughness, complex molding process, and low assembly precision limit their practical application. Plastic idlers offer advantages such as light weight, corrosion resistance, and low noise levels during high-speed operation. However, they suffer from poor heat and wear resistance. Existing improvements to plastic idlers involve wrapping a heat-resistant, mechanically strong fiberglass surface with a wear-resistant polyethylene material to improve its performance. Due to the incompatibility between the two surfaces, adhesives are often required to stabilize the surface bond. However, due to the unique operating environment of idlers, the heat generated by prolonged rotation and friction during material conveying can easily denature the adhesive, causing it to lose its adhesive activity. This can lead to separation between the polyethylene and fiberglass, potentially causing accidents. Moreover, since rollers often do not have antibacterial properties when used in areas such as food and medicine that have special requirements for environmental sterility, they are prone to contaminating medicines or food.

[0003] Therefore, designing a roller material with good antibacterial properties, high strength and wear resistance is of great significance for improving the performance of the roller. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention blends modified titanium dioxide-modified carbon nanotubes, glass fibers, and nylon to produce wear-resistant rollers with good strength, wear resistance, and antibacterial properties, thereby solving the technical problems raised in the background technology. Specifically, the technical solutions of the present invention include the following:

[0005] A nano-glass fiber polymer high-strength wear-resistant roller, the preparation method of the wear-resistant roller comprising the following steps:

[0006] Titanium dioxide modified nano-carbon tubes, glass fiber, nylon, antioxidant and plasticizer are added into a twin-screw extruder in a weight ratio of 8-14:31-35:84-90:0.5-1.2:0.6-1, and are mixed at 230°C-240°C for 80s-100s, 260°C-270°C for 120s-180s and 220°C-230°C for 5min-8min, then poured into a mold, and hot-pressed at 180°C-190°C and 2MPa-3MPa for 3min-4min to obtain the wear-resistant roller.

[0007] Furthermore, the preparation method of the titanium dioxide modified carbon nanotubes comprises the following steps:

[0008] The carbon nanotubes are subjected to plasma oxidation treatment to obtain oxidized carbon nanotubes;

[0009] The amino-terminated silane coupling agent and the oxidized carbon nanotubes are mixed and dispersed in deionized water, and acid is added to adjust the pH to 3-3.5, and then heated to 70-80° C. for reaction for 2-3 hours to obtain amino-terminated silane coupling agent-modified carbon nanotubes;

[0010] Titanium tetrachloride and the amino-terminated silane coupling agent modified carbon nanotubes are mixed and dispersed in anhydrous chloroform and stirred, and then alkali solution is added and reacted for 30 to 40 minutes. After the reaction is completed, the solid particles obtained by filtration are calcined at 400 to 500 degrees Celsius for 1 to 2 hours to obtain the titanium dioxide modified carbon nanotubes.

[0011] Furthermore, the conditions of the plasma oxidation treatment include oxygen gas, a gas flow rate of 70 ml / min to 100 ml / min, a power of 400 W to 500 W, and a treatment time of 60 s to 140 s.

[0012] Furthermore, the amino-terminated silane coupling agent includes 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane or N-phenyl-3-aminopropyltrimethoxysilane.

[0013] Preferably, the amino-terminated silane coupling agent is N-phenyl-3-aminopropyltrimethoxysilane.

[0014] Furthermore, the weight ratio of the amino-terminated silane coupling agent to the oxidized carbon nanotubes is 10-20:1.

[0015] Furthermore, the weight ratio of the titanium tetrachloride to the amino-terminated silane coupling agent modified carbon nanotubes is 10-15:1.

[0016] Furthermore, the alkali solution includes ammonia water with a mass concentration of 25% to 30%.

[0017] Furthermore, the glass fiber is chopped glass fiber.

[0018] Furthermore, the nylon is nylon 6.

[0019] Furthermore, the antioxidant includes antioxidant 1098 or antioxidant 168.

[0020] Furthermore, the plasticizer includes plasticizer JZ-218 or plasticizer JZ-506.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention first subjects carbon nanotubes to surface plasma oxidation modification to obtain oxidized carbon nanotubes. The oxidized carbon nanotubes are then mixed and dispersed with an amino-terminated silane coupling agent, followed by heating and coupling condensation to obtain amino-terminated silane coupling agent-modified carbon nanotubes. The amino-terminated silane coupling agent-modified carbon nanotubes and titanium tetrachloride are then mixed in chloroform and stirred for chelation. After chelation, alkaline solution is added for reaction, causing titanium ions to deposit in the amino-terminated silane coupling agent-modified carbon nanotubes. The titanium dioxide-modified carbon nanotubes are then blended with glass fiber and nylon to obtain a nanoglass fiber polymer high-strength, wear-resistant roller. Glass fiber has excellent heat resistance and mechanical strength, while nylon has excellent wear resistance. Their combined properties give the roller excellent mechanical properties, heat resistance, and wear resistance. To further enhance the roller's antibacterial properties, titanium dioxide is used to generate active superoxide ion radicals and hydroxyl radicals capable of penetrating bacterial cell walls under light, especially ultraviolet light, thereby exerting an antibacterial effect. However, the preparation process found that simply blending titanium dioxide with glass fiber and nylon resulted in poor mechanical properties and wear resistance of the roller. Therefore, using carbon nanotubes (CNTs) with good mechanical properties as a carrier, surface oxidation allowed them to obtain oxygen-containing functional groups such as hydroxyl and carboxyl groups. Subsequently, cross-linking and condensation with an amino-terminated silane coupling agent were performed. The role of the amino-terminated silane coupling agent is to, on the one hand, allow the CNTs modified with the amino-terminated silane coupling agent to obtain amino groups with chelated metal ions and titanium ions, allowing the titanium ions to adsorb to the CNTs modified with the amino-terminated silane coupling agent. Subsequently, titanium hydroxide is formed by alkali precipitation, and after high-temperature calcination, titanium dioxide-modified CNTs are formed. The silicon-oxygen bond has high-temperature stability, which prevents the titanium chelated on the amino-terminated silane coupling agent from falling off during high-temperature calcination. On the other hand, the amino-terminated silane coupling agent can also cross-link and condense with the silanol groups on the surface of the glass fiber, thereby introducing the titanium dioxide-modified CNTs into the glass fiber, reducing the defect of direct addition of titanium dioxide, which leads to uneven dispersion and thus affects mechanical properties. Through the preparation method of the present invention, the finally prepared roller not only has good strength and wear resistance, but also has antibacterial properties, thereby improving the application range of the roller in sterile environments or sterile equipment fields. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions of the present invention through the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] Unless otherwise specified, the raw materials and reagents used in the present invention are commercially available or can be prepared by known methods.

[0025] Carbon nanotubes were purchased from Foshan Pers Carbon Material Technology Co., Ltd.

[0026] Plasticizer JZ-218, Plasticizer JZ-506 Suzhou Jinzhong Chemical Co., Ltd.;

[0027] Chopped glass fiber was purchased from Chongqing International Composite Materials Co., Ltd.

[0028] Preparation Example 1:

[0029] The preparation method of titanium dioxide modified carbon nanotubes specifically includes the following steps:

[0030] The carbon nanotubes are evenly spread in the reaction chamber of the plasma reactor, and then sealed. Nitrogen is introduced into the sealed reaction chamber to expel the air to maintain an inert environment in the reaction chamber. Then the nitrogen is stopped, and oxygen is introduced into the plasma reactor. The oxygen flow rate is controlled to 70mL / min, the power is adjusted to 400W, and the voltage is maintained at 8kV to generate plasma. The carbon nanotubes are subjected to an oxidation treatment modification for 60s in this environment. After the modification is completed, the gas is turned off, and nitrogen is used to purge the residual gas in the reaction chamber. Finally, the modified oxidized carbon nanotubes are taken out for standby use;

[0031] Weigh 1 part by weight of 3-aminopropyltrimethoxysilane and 0.1 part by weight of oxidized carbon nanotubes, mix and add to 100 parts by weight of deionized water, then place in an ultrasonic disperser and disperse at a power of 400W for 20 minutes. After uniform dispersion, adjust the pH value to 3 with dilute hydrochloric acid, then heat to 70°C and stir at a speed of 400r / min for 2 hours. After the reaction is completed, the filtered particles are first rinsed with ethanol, then rinsed with deionized water until the pH value of the rinse water is neutral, and then placed in a vacuum drying oven at 60°C and dried to constant weight to obtain amino-terminated silane coupling agent modified carbon nanotubes;

[0032] Weigh 10 parts by weight of titanium tetrachloride and add it to 100 parts by weight of anhydrous chloroform, stirring evenly. Then, add 1 part by weight of amino-terminated silane coupling agent-modified carbon nanotubes and mix. Then, place it in an ultrasonic disperser and disperse it at 400W for 10 minutes. After uniform dispersion, stir it at 400r / min for 1 hour. Then, add 25% ammonia water and mix and stir until the pH reaches neutral. Then, react for 30 minutes. After the reaction is completed, filter and collect the solid particles. First, place the solid particles in a vacuum drying oven at 60°C to constant weight. Then, place them in a muffle furnace, heat them to 400°C at a heating rate of 5°C / min, and calcine them for 1 hour. After calcination, cool them naturally to room temperature to obtain titanium dioxide-modified carbon nanotubes.

[0033] Preparation Example 2:

[0034] The preparation method of titanium dioxide modified carbon nanotubes specifically includes the following steps:

[0035] The carbon nanotubes are evenly spread in the reaction chamber of the plasma reactor, and then sealed. Nitrogen is introduced into the sealed reaction chamber to expel the air to maintain an inert environment in the reaction chamber. Then the nitrogen is stopped, and oxygen is introduced into the plasma reactor. The oxygen flow rate is controlled to 80mL / min, the power is adjusted to 450W, and the voltage is maintained at 8kV to generate plasma. The carbon nanotubes are subjected to an oxidation treatment modification for 80s in this environment. After the modification is completed, the gas is turned off, and nitrogen is used to purge the residual gas in the reaction chamber. Finally, the modified oxidized carbon nanotubes are taken out for standby use;

[0036] Weigh 1.4 parts by weight of 3-aminopropyltriethoxysilane and 0.1 parts by weight of oxidized carbon nanotubes, mix and add to 140 parts by weight of deionized water, then place in an ultrasonic disperser and disperse at a power of 400W for 20 minutes. After uniform dispersion, adjust the pH value to 3 with dilute hydrochloric acid, then heat to 75°C and stir at a speed of 400r / min for 2.5 hours. After the reaction is completed, the filtered particles are first rinsed with ethanol, then rinsed with deionized water until the pH value of the rinse water is neutral, and then placed in a vacuum drying oven at 60°C and dried to constant weight to obtain amino-terminated silane coupling agent modified carbon nanotubes;

[0037] Weigh 12 parts by weight of titanium tetrachloride and add it to 120 parts by weight of anhydrous chloroform, stirring evenly. Then, add 1 part by weight of amino-terminated silane coupling agent to modify carbon nanotubes, mix, and then place in an ultrasonic disperser at 400W power for 10 minutes. After uniform dispersion, stir at 400r / min for 2 hours, then add 25% ammonia water, mix and stir until the pH reaches neutral, and then react for 34 minutes. After the reaction is completed, filter and collect to obtain solid particles. First, place the solid particles in a vacuum drying oven at 60°C to constant weight, then place in a muffle furnace, heat to 440°C at a heating rate of 5°C / min, and calcinate for 1 hour. After calcination, naturally cool to room temperature to obtain titanium dioxide modified carbon nanotubes.

[0038] Preparation Example 3:

[0039] The preparation method of titanium dioxide modified carbon nanotubes specifically includes the following steps:

[0040] The carbon nanotubes are evenly spread in the reaction chamber of the plasma reactor, and then sealed. Nitrogen is introduced into the sealed reaction chamber to exhaust the air to maintain an inert environment in the reaction chamber. Then the nitrogen is stopped, and oxygen is introduced into the plasma reactor. The oxygen flow rate is controlled to 90mL / min, the power is adjusted to 500W, and the voltage is maintained at 8kV to generate plasma. The carbon nanotubes are subjected to an oxidation treatment modification for 120s in this environment. After the modification is completed, the gas is turned off, and nitrogen is used to purge the residual gas in the reaction chamber. Finally, the modified oxidized carbon nanotubes are taken out for standby use;

[0041] Weigh 1.8 parts by weight of N-phenyl-3-aminopropyltrimethoxysilane and 0.1 parts by weight of oxidized carbon nanotubes, mix and add to 180 parts by weight of deionized water, then place in an ultrasonic disperser and disperse at a power of 400W for 20 minutes. After uniform dispersion, adjust the pH value to 3.5 with dilute hydrochloric acid, then heat to 75°C and stir at a speed of 400r / min for 3 hours. After the reaction is completed, the filtered particles are first rinsed with ethanol, then rinsed with deionized water until the pH value of the rinse water is neutral, and then placed in a vacuum drying oven at 60°C and dried to constant weight to obtain amino-terminated silane coupling agent modified carbon nanotubes;

[0042] Weigh 14 parts by weight of titanium tetrachloride and add it to 140 parts by weight of anhydrous chloroform, stirring evenly. Then, add 1 part by weight of amino-terminated silane coupling agent to modify carbon nanotubes, mix, and then place in an ultrasonic disperser at 400W power for 10 minutes. After uniform dispersion, stir at 400r / min for 2 hours, then add ammonia water with a mass concentration of 25-30%, stir and adjust the pH to neutral, and then react for 38 minutes. After the reaction is completed, filter and collect to obtain solid particles. First, place the solid particles in a vacuum drying oven at 60°C and dry to constant weight. Then, place them in a muffle furnace, heat to 480°C at a heating rate of 5°C / min, and calcine for 1.5 hours. After calcination, naturally cool to room temperature to obtain titanium dioxide modified carbon nanotubes.

[0043] Preparation Example 4:

[0044] The preparation method of titanium dioxide modified carbon nanotubes specifically includes the following steps:

[0045] The carbon nanotubes are evenly spread in the reaction chamber of the plasma reactor, and then sealed. Nitrogen is introduced into the sealed reaction chamber to expel the air to maintain an inert environment in the reaction chamber. Then the nitrogen is stopped, and oxygen is introduced into the plasma reactor. The oxygen flow rate is controlled to 100mL / min, the power is adjusted to 500W, and the voltage is maintained at 8kV to generate plasma. The carbon nanotubes are subjected to an oxidation treatment modification for 140s in this environment. After the modification is completed, the gas is turned off, and nitrogen is used to purge the residual gas in the reaction chamber. Finally, the modified oxidized carbon nanotubes are taken out for standby use;

[0046] Weigh 2 parts by weight of N-phenyl-3-aminopropyltrimethoxysilane and 0.1 parts by weight of oxidized carbon nanotubes, mix and add to 100 parts by weight of deionized water, then place in an ultrasonic disperser and disperse at a power of 400W for 20 minutes. After uniform dispersion, adjust the pH value to 3.5 with dilute hydrochloric acid, then heat to 80°C and stir at a speed of 400r / min for 3 hours. After the reaction is completed, the filtered particles are first rinsed with ethanol, then rinsed with deionized water until the pH value of the rinse water is neutral, and then placed in a vacuum drying oven at 60°C and dried to constant weight to obtain amino-terminated silane coupling agent-modified carbon nanotubes;

[0047] Weigh 15 parts by weight of titanium tetrachloride and add it to 150 parts by weight of anhydrous chloroform, stirring evenly. Then, add 1 part by weight of amino-terminated silane coupling agent-modified carbon nanotubes and mix. Then, place it in an ultrasonic disperser and disperse it at 400W for 10 minutes. After uniform dispersion, stir it at 400r / min for 3 hours. Then, add 30% ammonia water and stir until the pH reaches neutral, then react for 40 minutes. After the reaction is completed, filter and collect the solid particles. First, place the solid particles in a vacuum drying oven at 60°C to constant weight, then place them in a muffle furnace, heat them to 500°C at a heating rate of 5°C / min, and calcine them for 2 hours. After calcination, naturally cool them to room temperature to obtain titanium dioxide-modified carbon nanotubes.

[0048] Preparation Example 5:

[0049] The preparation method of titanium dioxide modified carbon nanotubes specifically includes the following steps:

[0050] The carbon nanotubes were completely immersed in a 60% nitric acid solution and then heated and oxidized in a 40°C water bath for 50 minutes. After the oxidation treatment, the oxidized carbon nanotubes were removed and rinsed with a large amount of distilled water until the pH of the rinse water was neutral. The carbon nanotubes were then dried in a vacuum drying oven at 70°C to a constant weight.

[0051] Weigh 2 parts by weight of N-phenyl-3-aminopropyltrimethoxysilane and 0.1 parts by weight of oxidized carbon nanotubes, mix and add to 100 parts by weight of deionized water, then place in an ultrasonic disperser and disperse at a power of 400W for 20 minutes. After uniform dispersion, adjust the pH value to 3.5 with dilute hydrochloric acid, then heat to 80°C and stir at a speed of 400r / min for 3 hours. After the reaction is completed, the filtered particles are first rinsed with ethanol, then rinsed with deionized water until the pH value of the rinse water is neutral, and then placed in a vacuum drying oven at 60°C and dried to constant weight to obtain amino-terminated silane coupling agent-modified carbon nanotubes;

[0052] Weigh 15 parts by weight of titanium tetrachloride and add it to 150 parts by weight of anhydrous chloroform, stirring evenly. Then, add 1 part by weight of amino-terminated silane coupling agent-modified carbon nanotubes and mix. Then, place it in an ultrasonic disperser and disperse it at 400W for 10 minutes. After uniform dispersion, stir it at 400r / min for 3 hours. Then, add 30% ammonia water and stir until the pH reaches neutral, then react for 40 minutes. After the reaction is completed, filter and collect the solid particles. First, place the solid particles in a vacuum drying oven at 60°C to constant weight, then place them in a muffle furnace, heat them to 500°C at a heating rate of 5°C / min, and calcine them for 2 hours. After calcination, naturally cool them to room temperature to obtain titanium dioxide-modified carbon nanotubes.

[0053] Preparation Example 6:

[0054] The preparation method of titanium dioxide modified carbon nanotubes specifically includes the following steps:

[0055] The 30% ammonia water in Preparation Example 4 was replaced with a 30% sodium hydroxide solution, and the other conditions remained the same as those in Preparation Example 4.

[0056] Example 1:

[0057] A nano glass fiber polymer high-strength wear-resistant roller, the specific method includes the following steps:

[0058] Weigh 8 parts by weight of titanium dioxide modified nanocarbon tubes obtained in Preparation Example 1, 31 parts by weight of chopped glass fibers, 84 parts by weight of nylon 6, 0.5 parts by weight of antioxidant 1098 and 0.6 parts by weight of plasticizer JZ-218, add them to a high-pressure mixer for pre-mixing, and then add the pre-mixed mixture to a twin-screw extruder. First, control the temperature to 230°C and mix for 80 seconds, then heat it to 260°C and mix it for 120 seconds, then cool it to 220°C and mix it for 5 minutes, pour it into a mold, and hot-press it at 180°C and 2 MPa for 3 minutes to obtain a wear-resistant roller.

[0059] Example 2:

[0060] A nano glass fiber polymer high-strength wear-resistant roller, the specific method includes the following steps:

[0061] Weigh 10 parts by weight of titanium dioxide modified nanocarbon tubes obtained in Preparation Example 2, 32 parts by weight of chopped glass fibers, 86 parts by weight of nylon 6, 0.7 parts by weight of antioxidant 1098 and 0.8 parts by weight of plasticizer JZ-218, add them to a high-pressure mixer for pre-mixing, and then add the pre-mixed mixture to a twin-screw extruder. First, control the temperature to 230°C and mix for 90 seconds, then heat it to 260°C and mix it for 140 seconds, then cool it to 220°C and mix it for 6 minutes, then pour it into a mold, and hot-press it at 180°C and 2 MPa for 3 minutes to obtain a wear-resistant roller.

[0062] Example 3:

[0063] A nano glass fiber polymer high-strength wear-resistant roller, the specific method includes the following steps:

[0064] Weigh 12 parts by weight of titanium dioxide modified nanocarbon tubes obtained in Preparation Example 3, 33 parts by weight of chopped glass fibers, 88 parts by weight of nylon 6, 1 part by weight of antioxidant 168 and 1 part by weight of plasticizer JZ-506, add them to a high-pressure mixer for pre-mixing, and then add the pre-mixed mixture to a twin-screw extruder. First, control the temperature to 240°C and mix for 90 seconds, then heat to 270°C and mix for 160 seconds, then cool to 230°C and mix for 7 minutes, pour into a mold, and hot-press for 4 minutes at 190°C and 3 MPa to obtain a wear-resistant roller.

[0065] Example 4:

[0066] A nano glass fiber polymer high-strength wear-resistant roller, the specific method includes the following steps:

[0067] Weigh 14 parts by weight of titanium dioxide modified nanocarbon tubes obtained in Preparation Example 4, 35 parts by weight of chopped glass fibers, 90 parts by weight of nylon 6, 1.2 parts by weight of antioxidant 168 and 1 part by weight of plasticizer JZ-506, add them to a high-pressure mixer for pre-mixing, and then add the pre-mixed mixture to a twin-screw extruder. First, control the temperature to 240°C and mix for 100s, then heat to 270°C and mix for 180s, then cool to 230°C and mix for 8 minutes, pour into a mold, and hot press for 4 minutes at 190°C and 3MPa to obtain a wear-resistant roller.

[0068] Comparative Example 1:

[0069] A nano glass fiber polymer high-strength wear-resistant roller, the specific method includes the following steps:

[0070] Weigh 14 parts by weight of titanium dioxide modified nanocarbon tubes obtained in Preparation Example 5, 35 parts by weight of chopped glass fibers, 90 parts by weight of nylon 6, 1.2 parts by weight of antioxidant 168 and 1 part by weight of plasticizer JZ-506, add them to a high-pressure mixer for pre-mixing, and then add the pre-mixed mixture to a twin-screw extruder. First, control the temperature to 240°C and mix for 100s, then heat to 270°C and mix for 180s, then cool to 230°C and mix for 8 minutes, pour into a mold, and hot press for 4 minutes at 190°C and 3MPa to obtain a wear-resistant roller.

[0071] Comparative Example 2:

[0072] A nano glass fiber polymer high-strength wear-resistant roller, the specific method includes the following steps:

[0073] Weigh 14 parts by weight of titanium dioxide modified nanocarbon tubes obtained in Preparation Example 6, 35 parts by weight of chopped glass fibers, 90 parts by weight of nylon 6, 1.2 parts by weight of antioxidant 168 and 1 part by weight of plasticizer JZ-506, add them to a high-pressure mixer for pre-mixing, and then add the pre-mixed mixture to a twin-screw extruder. First, control the temperature to 240°C and mix for 100s, then heat to 270°C and mix for 180s, then cool to 230°C and mix for 8 minutes, pour into a mold, and hot press for 4 minutes at 190°C and 3MPa to obtain a wear-resistant roller.

[0074] Comparative Example 3:

[0075] A nano glass fiber polymer high-strength wear-resistant roller, the specific method includes the following steps:

[0076] Weigh 14 parts by weight of titanium dioxide modified nanocarbon tubes obtained in Preparation Example 4, 35 parts by weight of chopped glass fibers, 90 parts by weight of nylon 66, 1.2 parts by weight of antioxidant 168 and 1 part by weight of plasticizer JZ-506, add them to a high-pressure mixer for pre-mixing, and then add the pre-mixed mixture to a twin-screw extruder. First, control the temperature to 240°C, mix for 100s, then heat to 270°C and mix for 180s, then cool to 230°C and mix for 8 minutes, pour into a mold, and hot press for 4 minutes at 190°C and 3MPa to obtain a wear-resistant roller.

[0077] Comparative Example 4:

[0078] A nano glass fiber polymer high-strength wear-resistant roller, the specific method includes the following steps:

[0079] 7 parts by weight of carbon nanotubes, 7 parts by weight of titanium dioxide powder, 35 parts by weight of chopped glass fibers, 90 parts by weight of nylon 6, 1.2 parts by weight of antioxidant 168 and 1 part by weight of plasticizer JZ-506 were weighed and added to a high-pressure mixer for pre-mixing. The pre-mixed mixture was then added to a twin-screw extruder. The temperature was first controlled at 240°C and the mixing process was timed for 100 seconds. The temperature was then raised to 270°C for mixing for 180 seconds, and then the temperature was lowered to 230°C for mixing for 8 minutes. The mixture was then poured into a mold and hot-pressed at 190°C and 3 MPa for 4 minutes to obtain a wear-resistant roller.

[0080] Mechanical properties test:

[0081] (1) Tensile strength test:

[0082] The wear-resistant rollers prepared in Examples 1 to 4 and Comparative Examples 1 to 4 were prepared into sample strips with a length of 60 mm, a width of 8 mm and a thickness of 4 mm, and placed on a universal testing machine for tensile testing. The test conditions were: in an environment of 25±2°C, the tensile rate was adjusted to 20 mm / min, and the results are shown in Table 1 below.

[0083] Table 1 Mechanical properties

[0084]

[0085]

[0086] (2) Wear resistance test:

[0087] The wear-resistant rollers prepared in Examples 1 to 4 and Comparative Examples 1 to 4 were prepared into test strips with a length of 60 mm, a width of 8 mm, and a thickness of 4 mm. The weight loss before and after wear was tested in accordance with GB / T 3960-2016 Test Method for Sliding Friction and Wear of Plastics. The results are shown in Table 2 below.

[0088] Table 2 Weight loss

[0089] Sources Weight loss (mg) Example 1 22.34 Example 2 19.38 Example 3 18.67 Example 4 18.03 Comparative Example 1 29.31 Comparative Example 2 32.44 Comparative Example 3 40.37 Comparative Example 4 39.84

[0090] Antibacterial testing:

[0091] The wear-resistant rollers prepared in Examples 1 to 4 and Comparative Examples 1 to 4 were made into discs with a diameter of 5 cm, and the colony count was measured at 1×10 7 ~1×10 8 cfu / ml of Staphylococcus aureus was spread on the surface of the disc and then irradiated under a 100W UV lamp for 20 minutes. 7 ~1×10 8A Staphylococcus aureus solution of cfu / ml was spread on the surface of a conventional LB solid culture medium, and then placed under a 100W ultraviolet lamp for 20 minutes. After the irradiation, the size of the inhibition zone was measured with a ruler. The results are shown in Table 3 below.

[0092] Table 3 Inhibition zone diameter

[0093] Sources Diameter of inhibition zone (mm) Example 1 8 Example 2 8 Example 3 9 Example 4 10 Comparative Example 1 2 Comparative Example 2 8 Comparative Example 3 8 Comparative Example 4 9 Blank group ＜1

[0094] The following conclusions can be drawn from Tables 1 to 3 above:

[0095] (1) It can be found from Examples 1 to 4 that the wear-resistant roller prepared by blending the modified titanium dioxide-modified carbon nanotubes, glass fiber and nylon has good antibacterial properties, mechanical properties and wear resistance, and Examples 3 and 4 are better than Examples 1 and 2 in mechanical performance. This may be because in this system, the rigid benzene ring on the N-phenyl-3-aminopropyltrimethoxysilane structure has a good synergistic effect on improving mechanical strength.

[0096] (2) It can be found from Comparative Example 1 that although nitric acid can also increase oxygen-containing active groups when the carbon nanotubes are oxidized, the wear-resistant rollers prepared in this system have poor antibacterial and mechanical properties. This may be because the carbon nanotubes are agglomerated, and the oxidation treatment with nitric acid cannot uniformly impregnate and oxidize the carbon nanotubes, resulting in the destruction of the matrix structure of the carbon nanotubes, making it difficult to effectively load titanium ions. Instead, when the titanium dioxide-modified carbon nanotubes prepared are blended to prepare wear-resistant rollers, the performance of the wear-resistant rollers is poor.

[0097] (3) It can be found from Comparative Example 2 that after using a sodium hydroxide solution with a mass concentration of 30% to deposit titanium ions, the wear-resistant roller prepared has good antibacterial properties, but poor mechanical properties. This may be because the role of using alkaline solution for mixing and stirring is to enable the titanium ions chelated on the amino-terminated silane coupling agent-modified carbon nanotubes to be deposited and fixed on the amino-terminated silane coupling agent-modified carbon nanotubes, and the alkalinity of sodium hydroxide is much higher than that of ammonia water, which may cause the titanium ions to precipitate too quickly and easily aggregate, and then the titanium dioxide deposition is uneven after high-temperature calcination, which affects the mechanical properties of the wear-resistant roller when it is prepared by blending.

[0098] (4) It can be found from Comparative Example 3 that when nylon 6 is replaced by nylon 66, the wear-resistant roller prepared has good antibacterial properties, but poor mechanical properties. This may be because the molecular arrangement of nylon 66 is relatively tighter than that of nylon 6. When blended, the interface compatibility of nylon 66 with other substances is low, and the blending effect in this system is poor, which in turn makes the mechanical properties of the wear-resistant roller prepared poor.

[0099] (5) Through comparative example 4, it can be found that although the direct addition of titanium dioxide powder can improve the antibacterial properties of the wear-resistant roller, since the particle size of carbon nanotubes and titanium dioxide powder is relatively fine and easy to agglomerate, the compatibility may be poor during blending, and the distribution in the wear-resistant roller may be uneven, which in turn makes the mechanical strength performance poor.

[0100] The embodiments described above provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A nano glass fiber polymer high strength wear-resistant roller, characterized in that: The preparation method of the wear-resistant roller comprises the following steps: Titanium dioxide modified nano-carbon tubes, glass fiber, nylon, antioxidant and plasticizer are added into a twin-screw extruder in a weight ratio of 8-14:31-35:84-90:0.5-1.2:0.6-1, and mixed at 230-240°C for 80s-100s, 260-270°C for 120s-180s and 220-230°C for 5min-8min, then poured into a mold, and hot-pressed at 180-190°C and 2MPa-3MPa for 3min-4min to obtain the wear-resistant roller; The preparation method of the titanium dioxide modified carbon nanotubes comprises the following steps: The carbon nanotubes are subjected to plasma oxidation treatment to obtain oxidized carbon nanotubes; The amino-terminated silane coupling agent and the oxidized carbon nanotubes are mixed and dispersed in deionized water, and acid is added to adjust the pH to 3-3.5, and then heated to 70-80° C. for reaction for 2-3 hours to obtain amino-terminated silane coupling agent-modified carbon nanotubes; Titanium tetrachloride and the amino-terminated silane coupling agent modified carbon nanotubes are mixed and dispersed in anhydrous chloroform and stirred, and then an alkali solution is added and mixed to react for 30 minutes to 40 minutes. After the reaction is completed, the solid particles obtained by filtration are calcined at 400° C. to 500° C. for 1 hour to 2 hours to obtain the titanium dioxide modified carbon nanotubes; The nylon is nylon 6; The conditions of the plasma oxidation treatment include oxygen gas, a gas flow rate of 70 ml / min to 100 ml / min, a power of 400 W to 500 W, and a treatment time of 60 s to 140 s; The alkali solution is ammonia water with a mass concentration of 25% to 30%.

2. The nano glass fiber polymer high strength wear-resistant roller according to claim 1, characterized in that: The amino-terminated silane coupling agent includes 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane or N-phenyl-3-aminopropyltrimethoxysilane.

3. The nano glass fiber polymer high strength wear-resistant roller according to claim 1, characterized in that: The weight ratio of the amino-terminated silane coupling agent to the oxidized nano-carbon tubes is 10-20:

1.

4. The nano glass fiber polymer high strength wear-resistant roller according to claim 1, characterized in that: The weight ratio of the titanium tetrachloride to the amino-terminated silane coupling agent modified carbon nanotubes is 10-15:

1.

5. The nano glass fiber polymer high strength wear-resistant roller according to claim 1, characterized in that: The glass fibers are chopped glass fibers.

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