Nano glass fiber polymer high-strength wear-resistant carrier roller

Abstract

The invention discloses a nano glass fiber polymer high-strength wear-resistant carrier roller, and belongs to the technical field of preparation of carrier rollers for material conveying. Comprising the following steps: adding titanium dioxide modified carbon nanotubes, glass fibers, nylon, an antioxidant and a plasticizer into a double-screw extruder according to a weight part ratio of (8-14): (31-35): (84-90): (0.5-1.2): (0.6-1), sequentially carrying out mixing treatment at 230-240 DEG C for 80-100 seconds, carrying out mixing treatment at 260-270 DEG C for 120-180 seconds, and carrying out mixing treatment at 220-230 DEG C for 5-8 minutes, pouring into a grinding tool, and carrying out hot pressing treatment in an environment at 180-190 DEG C and 2-3 MPa for 3-4 minutes to obtain the wear-resistant carrier roller. According to the wear-resistant carrier roller, the titanium dioxide modified carbon nanotubes obtained through modification, the glass fibers and the nylon are blended, so that the prepared wear-resistant carrier roller has good strength, wear resistance and antibacterial performance.

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 vertical angle 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 process of pharmaceutical production, 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 process of food or pharmaceutical packaging, 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 groove rollers, buffer rollers, parallel rollers, etc. At present, the main materials of rollers include steel rollers, ceramic rollers, plastic rollers, etc. Steel rollers have poor wear resistance, and the burrs caused by wear are easy to damage the belt. In addition, steel rollers are easy to rust and stick to materials, which brings great inconvenience to the management and maintenance of equipment. Ceramic rollers have the advantages of wear resistance, oxidation resistance and non-sticking, but they are heavy, poor toughness, complex molding process, and low installation precision, which limits the scope of practical application. Plastic rollers have the advantages of light weight, corrosion resistance, and low noise at high speed, but plastic rollers have poor heat resistance and wear resistance. In the existing technology, the improvement of plastic rollers is to use polyethylene materials with good wear resistance to wrap the surface of glass fiber with high heat resistance and mechanical strength to improve the performance of plastic rollers. Due to the incompatibility of the interface between the two, it is often necessary to use adhesive materials to achieve the stability of the surface combination of the two. However, due to the particularity of the use environment of the rollers, the heat generated during the long-term rotation and friction conveying of materials can easily cause the adhesive material to denature and lose its adhesive activity, which in turn causes the polyethylene and glass fiber to separate easily, resulting in a generation accident. 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 prior art, the present invention blends the modified titanium dioxide-modified nanocarbon tubes, glass fibers and nylon to prepare a wear-resistant roller having good strength, wear resistance and antibacterial properties, thereby solving the technical problems raised in the background technology. Specifically, the technical solution of the present invention includes the following contents:

[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, mixed at 230°C-240°C for 80s-100s, at 260°C-270°C for 120s-180s and at 220°C-230°C for 5min-8min, 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 method for preparing 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 the 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 to react for 30min to 40min. After the reaction is completed, the solid particles obtained by filtering are calcined at 400°C to 500°C for 1h to 2h to obtain the titanium dioxide modified carbon nanotubes.

[0011] Furthermore, the conditions of the plasma oxidation treatment include oxygen as 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 nano-carbon tubes 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 comprises aqueous ammonia with a mass concentration of 25% to 30%.

[0017] Furthermore, the glass fibers are chopped glass fibers.

[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 performs surface plasma oxidation modification on carbon nanotubes to obtain oxidized carbon nanotubes, and then mixes and disperses the oxidized carbon nanotubes and terminal amino silane coupling agents, and then heats and couples and condenses to obtain terminal amino silane coupling agent modified carbon nanotubes. Then, the terminal amino silane coupling agent modified carbon nanotubes and titanium tetrachloride are mixed in chloroform and stirred for chelation. After the chelation is completed, alkali solution is added to react so that titanium ions are deposited in the terminal amino silane coupling agent modified carbon nanotubes, and then high-temperature calcination is performed to obtain titanium dioxide modified carbon nanotubes. Titanium dioxide modified carbon nanotubes, glass fibers and nylon are blended to obtain nano glass fiber polymer high-strength wear-resistant rollers. Glass fibers have good heat resistance and mechanical strength, while nylon has good wear resistance. The mutual cooperation can make the roller have good mechanical properties, heat resistance and wear resistance. In order to further improve the antibacterial properties of the roller, titanium dioxide is used to form active superoxide ion radicals and hydroxyl radicals that can penetrate bacterial cell walls under light, especially under ultraviolet rays, thereby playing an antibacterial role. However, it was found through preparation that simply blending titanium dioxide with glass fiber and nylon showed poor mechanical properties and wear resistance of the roller. Therefore, nano-carbon tubes with good mechanical properties were used as carriers, and surface oxidation was used to obtain oxygen-containing functional groups such as hydroxyl and carboxyl groups, and then cross-linked and condensed with terminal amino silane coupling agents. The role of terminal amino silane coupling agents is that, on the one hand, the terminal amino silane coupling agent modified nano-carbon tubes obtain amino groups with chelated metal ions and titanium ions, so that titanium ions are adsorbed to the terminal amino silane coupling agent modified nano-carbon tubes, and then titanium hydroxide is formed by alkali precipitation, and titanium dioxide modified nano-carbon tubes are formed after high-temperature calcination. The silicon oxygen bond has high temperature stability, which avoids the titanium chelated on the terminal amino silane coupling agent from falling off during high-temperature calcination. On the other hand, the terminal amino silane coupling agent can also cross-link and condense with the silicon hydroxyl groups on the surface of the glass fiber, thereby introducing the titanium dioxide modified nano-carbon tubes into the glass fiber, reducing the defect of directly adding titanium dioxide to cause uneven dispersion and thus affect the 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 scope of the roller in the field of sterile environments or sterile equipment. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below through the embodiments of the present invention. Obviously, the described embodiments 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 creative work are 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] The 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 exhaust the air to maintain an inert environment in the reaction chamber. Then the introduction of nitrogen is stopped, and oxygen is introduced into the plasma reactor. The flow rate of oxygen 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 oxidation modification for 60s in this environment. After the modification is completed, the gas is turned off, and the residual gas in the reaction chamber is purged with nitrogen. 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 and stir evenly, then add 1 part by weight of amino-terminated silane coupling agent to modify the carbon nanotubes, and then place it in an ultrasonic disperser and disperse it at a power of 400W for 10 minutes. After uniform dispersion, stir at a speed of 400r / min for 1 hour, then add ammonia water with a mass concentration of 25% and mix and stir to make the pH reach neutral, and then react for 30 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 400°C at a heating rate of 5°C / min, and calcine for 1 hour. After calcination, naturally cool 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 exhaust the air to maintain an inert environment in the reaction chamber. Then the introduction of nitrogen is stopped, and oxygen is introduced into the plasma reactor. The flow rate of oxygen 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 oxidation treatment modification for 80s in this environment. After the modification is completed, the gas is turned off, and the residual gas in the reaction chamber is purged with nitrogen. 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 2.5h. 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 and stir evenly, then add 1 part by weight of amino-terminated silane coupling agent to modify the carbon nanotubes, and then place it in an ultrasonic disperser and disperse it at a power of 400W for 10 minutes. After uniform dispersion, stir at a speed of 400r / min for 2 hours, then add ammonia water with a mass concentration of 25%, mix and stir, and make the pH reach neutral, and then react for 34 minutes. After the reaction is completed, filter and collect to obtain solid particles, first put the solid particles into a vacuum drying oven at 60°C and dry them to constant weight, then place them in a muffle furnace, heat them to 440°C at a heating rate of 5°C / min, and calcine them 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 stop introducing nitrogen, and then introduce oxygen into the plasma reactor, control the oxygen flow rate to 90mL / min, adjust the power to 500W, and maintain the voltage at 8kV to generate plasma. The carbon nanotubes are subjected to oxidation modification for 120s in this environment. After the modification is completed, turn off the gas, and use nitrogen to purge the residual gas in the reaction chamber, and finally take out the modified oxidized carbon nanotubes 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 and stir evenly, then add 1 part by weight of amino-terminated silane coupling agent to modify the carbon nanotubes, and then place it in an ultrasonic disperser and disperse it at a power of 400W for 10 minutes. After uniform dispersion, stir at a speed of 400r / min for 2 hours, then add ammonia water with a mass concentration of 25-30% to mix and stir and make the pH reach 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 exhaust the air to maintain an inert environment in the reaction chamber. Then the introduction of nitrogen is stopped, and oxygen is introduced into the plasma reactor. The flow rate of oxygen is controlled to be 100mL / min, the power is adjusted to 500W, and the voltage is maintained at 8kV to generate plasma. The carbon nanotubes are subjected to oxidation modification for 140s in this environment. After the modification is completed, the gas is turned off, and the residual gas in the reaction chamber is purged with nitrogen. 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 and stir evenly, then add 1 part by weight of amino-terminated silane coupling agent to modify the carbon nanotubes, and then place it in an ultrasonic disperser and disperse it at a power of 400W for 10 minutes. After uniform dispersion, stir at a speed of 400r / min for 3 hours, then add ammonia water with a mass concentration of 30%, mix and stir, and make the pH reach neutral, and then react for 40 minutes. After the reaction is completed, filter and collect to obtain solid particles, first put the solid particles into a vacuum drying oven at 60°C and dry them 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 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 nitric acid solution with a mass concentration of 60%, and then placed in a water bath at a temperature of 40°C for heating and oxidation treatment for 50 minutes. After the oxidation treatment was completed, the oxidized carbon nanotubes were taken out and the surface nitric acid solution was rinsed with a large amount of distilled water until the pH of the rinse water was neutral, and then placed in a vacuum drying oven at 70°C to dry to constant weight for standby use;

[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 and stir evenly, then add 1 part by weight of amino-terminated silane coupling agent to modify the carbon nanotubes, and then place it in an ultrasonic disperser and disperse it at a power of 400W for 10 minutes. After uniform dispersion, stir at a speed of 400r / min for 3 hours, then add ammonia water with a mass concentration of 30%, mix and stir, and make the pH reach neutral, and then react for 40 minutes. After the reaction is completed, filter and collect to obtain solid particles, first put the solid particles into a vacuum drying oven at 60°C and dry them 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 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 by a 30% sodium hydroxide solution, and the other conditions remained the same as in Preparation Example 4.

[0056] Embodiment 1:

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

[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-speed mixer for pre-mixing, and then add the pre-mixed mixture to a twin-screw extruder. First, control the temperature to 230°C and perform mixing for 80 seconds, then raise the temperature to 260°C and perform mixing for 120 seconds, then cool to 220°C and perform mixing for 5 minutes, pour into a mold, and perform hot pressing at 180°C and 2MPa for 3 minutes to obtain a wear-resistant roller.

[0059] Embodiment 2:

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

[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 mixer for pre-mixing, and then add the pre-mixed mixture to a twin-screw extruder. First, control the temperature to 230°C and perform mixing for 90 seconds, then raise the temperature to 260°C and perform mixing for 140 seconds, then lower the temperature to 220°C and perform mixing for 6 minutes, pour into a mold, and hot-press for 3 minutes at 180°C and 2MPa to obtain a wear-resistant roller.

[0062] Embodiment 3:

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

[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 mixer for pre-mixing, and then add the pre-mixed mixture to a twin-screw extruder. First, control the temperature to 240°C and perform mixing for 90 seconds, then raise the temperature to 270°C and perform mixing for 160 seconds, then lower the temperature to 230°C and perform mixing for 7 minutes, pour into a mold, and perform hot pressing at 190°C and 3MPa for 4 minutes to obtain a wear-resistant roller.

[0065] Embodiment 4:

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

[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-speed 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 100 seconds, then raise the temperature to 270°C and mix for 180 seconds, then cool to 230°C and mix for 8 minutes, pour into a mold, and hot-press at 190°C and 3MPa for 4 minutes 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 process:

[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-speed 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 100 seconds, then raise the temperature to 270°C and mix for 180 seconds, then cool to 230°C and mix for 8 minutes, pour into a mold, and hot-press at 190°C and 3MPa for 4 minutes 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 process:

[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-speed 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 100 seconds, then raise the temperature to 270°C and mix for 180 seconds, then cool to 230°C and mix for 8 minutes, pour into a mold, and hot-press at 190°C and 3MPa for 4 minutes 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 process:

[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-speed 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 100 seconds, then raise the temperature to 270°C and mix for 180 seconds, then cool to 230°C and mix for 8 minutes, pour into a mold, and hot-press at 190°C and 3 MPa for 4 minutes 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 process:

[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-speed mixer for pre-mixing. The pre-mixed mixture was then added to a twin-screw extruder. The temperature was first controlled to 240°C and the mixing treatment was timed for 100 seconds. The temperature was then raised to 270°C and the mixing treatment was performed for 180 seconds. The temperature was then lowered to 230°C and the mixing treatment was performed 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 were 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, and then 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] Antimicrobial Testing:

[0091] The wear-resistant rollers prepared in Examples 1 to 4 and Comparative Examples 1 to 4 were prepared into discs with a diameter of 5 cm, and then the number of colonies was 1×10 7 ~1×10 8 cfu / ml of Staphylococcus aureus was applied on the surface of the disc, and then placed under a 100W UV lamp for 20 minutes. 7 ~1×10 8cfu / ml of Staphylococcus aureus liquid 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:

[0095] (1) It can be found from Examples 1 to 4 that the wear-resistant roller prepared by blending the modified titanium dioxide-modified nanocarbon tubes, glass fibers 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 properties. This may be because in this system, the rigid benzene ring on the structure of N-phenyl-3-aminopropyltrimethoxysilane 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 with nitric acid, the wear-resistant rollers prepared in this system have poor antibacterial and mechanical properties. This may be due to the agglomeration of the carbon nanotubes. 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 wear-resistant rollers are prepared by blending the prepared titanium dioxide-modified carbon nanotubes, 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 deposit 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 tight relative to that of nylon 6. When blended, nylon 66 has low interfacial compatibility with other substances. The blending effect in this system is poor, which in turn makes the mechanical properties of the wear-resistant roller prepared poor.

[0099] (5) It can be found from Comparative Example 4 that although the direct addition of titanium dioxide powder can improve the antibacterial properties of the wear-resistant roller, due to the fine particle size of carbon nanotubes and titanium dioxide powder, they are easy to agglomerate, which may result in poor compatibility during blending and uneven distribution in the wear-resistant roller, which in turn results in poor mechanical strength performance.

[0100] The above-described embodiments provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected.

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, mixed at 230°C-240°C for 80s-100s, at 260°C-270°C for 120s-180s and at 220°C-230°C for 5min-8min, poured into a mold, and hot-pressed at 180°C-190°C and 2MPa-3MPa for 3min-4min to obtain the wear-resistant roller.

2. According to claim 1, a nano glass fiber polymer high-strength wear-resistant roller is characterized in that: The method for preparing 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 the 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 alkali solution is added to react for 30min to 40min. After the reaction is completed, the solid particles obtained by filtering are calcined at 400°C to 500°C for 1h to 2h to obtain the titanium dioxide modified carbon nanotubes.

3. According to claim 2, a nano glass fiber polymer high-strength wear-resistant roller is characterized in that: 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.

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

5. The nano glass fiber polymer high-strength wear-resistant roller according to claim 2, characterized in that: The weight ratio of the amino-terminated silane coupling agent to the oxidized nano-carbon tubes is 10-20:

1.

6. The nano glass fiber polymer high-strength wear-resistant roller according to claim 2, characterized in that: The weight ratio of the titanium tetrachloride to the amino-terminated silane coupling agent modified carbon nanotubes is 10-15:

1.

7. The nano glass fiber polymer high-strength wear-resistant roller according to claim 2, characterized in that: The alkali solution comprises ammonia water with a mass concentration of 25% to 30%.

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

9. The nano glass fiber polymer high-strength wear-resistant roller according to claim 1, characterized in that: The nylon is nylon 6.

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