Self-cleaning self-lubricating dust suppression and noise reduction conveyor carrier roller and preparation method thereof

Abstract

The invention belongs to the technical field of polyolefin composite materials, and particularly relates to a self-cleaning self-lubricating dust suppression and noise reduction conveyor carrier roller and a preparation method thereof. Graphene, polytetrafluoroethylene, polyvinylidene fluoride, a coupling agent, a compatilizer and polyolefin are used as raw materials, the graphene, the polytetrafluoroethylene and the polyvinylidene fluoride are used for modifying the polyolefin, the coupling agent and the compatilizer are used for promoting blending of all the raw materials, and the composite material is obtained through melt shearing dispersion, injection molding and hot pressing. And the self-cleaning self-lubricating dust suppression and noise reduction conveyor carrier roller is obtained. The self-cleaning and self-lubricating dust suppression and noise reduction conveyor carrier roller obtained through the method has the functions of self-cleaning, self-lubricating, dust suppression and noise reduction, and the technical defects of a conveyor carrier roller in the prior art are overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of polyolefin composite materials, and particularly relates to a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller and a preparation method thereof. Background Art

[0002] Conveyors are important equipment that are widely used in logistics, manufacturing and other industries. Conveyor rollers are an important part of conveyors. Their function is to support and drive conveyor belts. However, traditional conveyor rollers generate a lot of dust during operation. The existing technology uses dust removal equipment to reduce dust, which increases the manufacturing and maintenance costs of the equipment. This not only affects the normal operation of the equipment, but also causes troubles to the operators and the environment. Summary of the invention

[0003] In view of the deficiencies in the above-mentioned prior art, the present invention provides a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller and a preparation method thereof. The present invention uses graphene, polytetrafluoroethylene, polyvinylidene fluoride, coupling agent, compatibilizer and polyolefin as raw materials, uses graphene, polytetrafluoroethylene and polyvinylidene fluoride to modify polyolefin, uses coupling agent and compatibilizer to promote the blending of the raw materials, and obtains a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller through melt shear dispersion, injection molding and hot pressing. The self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller obtained by the method of the present invention has the functions of self-cleaning, self-lubricating and dust-suppressing and noise-reducing, and overcomes the technical defects of the conveyor rollers in the prior art.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A method for preparing a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller comprises the following steps:

[0006] The raw materials are weighed according to the following weight percentages: graphene 3±0.2%, polytetrafluoroethylene 10±0.5%, polyvinylidene fluoride 10±0.5%, coupling agent 2±0.1%, compatibilizer 2±0.1%, and the balance is polyolefin. The sum of the weight percentages of the raw materials is 100%.

[0007] Graphene and polytetrafluoroethylene are mixed to obtain a first mixed material.

[0008] The polyvinylidene fluoride, coupling agent, compatibilizer and polyolefin are mixed to obtain a second mixed material.

[0009] After the second mixed material is mixed with the first mixed material, melt shear dispersion is carried out at 180-300° C. and 1-5 MPa to obtain a composite modified material; the composite modified material prepared within this temperature range has good comprehensive performance.

[0010] The composite modified material is sequentially subjected to injection molding and hot pressing to obtain a preliminary shape through injection molding, and is further solidified through hot pressing to obtain a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

[0011] Preferably, the particle size of graphene is 10-20 nm, the particle size of polytetrafluoroethylene is 5-10 μm, and the particle size of polyvinylidene fluoride is 1-5 μm. Within this particle size range, the dispersion effect is the best.

[0012] Preferably, the polyolefin is selected from one or more of high-density polyethylene, linear low-density polyethylene, isotactic polypropylene, syndiotactic polypropylene and atactic polypropylene.

[0013] Preferably, the compatibilizer is selected from one or more of maleic anhydride, dicumyl peroxide, ethylene-acrylate, and polyolefin elastomer.

[0014] Preferably, the coupling agent is selected from a silane coupling agent or a phthalate coupling agent.

[0015] Preferably, a lubricant is added during the preparation of the first mixed material, and the lubricant is selected from polyethylene wax, paraffin, white oil or vinyl bisstearylamide.

[0016] Preferably, the mass percentage of the lubricant in the composite modified material is 3±0.2%.

[0017] Preferably, an auxiliary agent is also added during the preparation of the second mixture, and the auxiliary agent consists of antioxidant 1010 and antioxidant 168. Antioxidant 1010 and antioxidant 168 are used in combination to enhance each other's antioxidant effect, thereby improving the antioxidant performance of the entire self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

[0018] Preferably, the mass percentage of antioxidant 1010 and antioxidant 168 in the composite modified material is both 1±0.1%.

[0019] Preferably, the injection molding conditions are: 180-220°C, 5-15MPa.

[0020] Preferably, the hot pressing conditions are: 200-250°C, 1-5MPa.

[0021] The present invention also protects the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller prepared by the preparation method.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention uses graphene, polytetrafluoroethylene, polyvinylidene fluoride, coupling agent, compatibilizer and polyolefin as raw materials, and obtains self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor rollers through melt shear dispersion, injection molding and hot pressing. In the present invention, polyolefin is used as a matrix, graphene, polytetrafluoroethylene and polyvinylidene fluoride are used to modify polyolefin, coupling agent and compatibilizer are used to promote the blending of various raw materials, and self-cleaning, self-lubricating and dust-suppressing and noise-reducing conveyor rollers are obtained.

[0024] In the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor rollers, the self-cleaning ability is mainly derived from polytetrafluoroethylene. Polytetrafluoroethylene not only has the characteristics of low surface energy and non-stickiness, but also in the present invention, by regulating the temperature and pressure of melt shear dispersion, the content of β crystals in polyvinylidene fluoride is increased, and its piezoelectric properties are utilized. Under the vibration caused by the noise generated when the rollers are running, the crystal structure inside the polyvinylidene fluoride with a high β crystal content is deformed, and the positive and negative charge centers are separated, thereby generating an electric potential difference on the surface of the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor rollers, forming an electric charge, and then forming an electric field, thereby achieving the effect of capturing and suppressing dust. After stopping the operation, the positive and negative charges return to their positions, the electric field disappears, and the dust falls, thereby achieving a self-cleaning effect.

[0025] The present invention uses graphene as a raw material. Graphene increases the charge storage capacity, improves the electric field strength formed by polyvinylidene fluoride, and promotes the dust capture and dust suppression effect.

[0026] The invention uses polytetrafluoroethylene as a raw material. The polytetrafluoroethylene reduces the surface viscosity of the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller, making it difficult for dust to adhere to the surface and enhancing the self-cleaning ability.

[0027] In addition, the present invention modifies polyolefin so that the electric charge carried on its surface can adsorb dust, thereby achieving a dust suppression effect without the need for additional dust removal equipment.

[0028] 2. The conveyor rollers of the prior art also have the following technical defects: (1) The heavy weight of metal rollers will cause large running resistance and generate noise. Noise pollution is an important environmental issue. Noise not only affects people's health, but also has adverse effects on wildlife and ecosystems. (2) Metal rollers have poor wear resistance. Burrs caused by wear during use will damage the belt. (3) The molding process of non-metal rollers is complicated and the cost is high, which is not conducive to large-scale production and application.

[0029] Compared with the prior art, the present invention also solves the problems of traditional metal rollers being heavy, costly, and having large running resistance and noise due to poor wear resistance. Graphene is a new material with excellent properties, including high electrical conductivity, high thermal conductivity, good lubrication, good mechanical properties and processing properties; polytetrafluoroethylene and polyvinylidene fluoride are two common engineering plastics with good chemical stability and high temperature resistance. The present invention utilizes graphene combined with polytetrafluoroethylene and polyvinylidene fluoride to modify polyolefins, thereby obtaining a roller with light weight, low cost, good wear resistance, low running resistance and low noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the working principle diagram of dust collection and dust suppression of self-cleaning, self-lubricating, dust suppression and noise reduction conveyor rollers.

[0031] Figure 2 This is a flow chart for preparing the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor rollers of Examples 1 to 5 of the present invention. DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention. The experimental methods described in the embodiments of the present invention are conventional methods unless otherwise specified.

[0033] The technical solution of the present invention is studied using embodiments and comparative examples below, and the specific research methods and results are as follows:

[0034] Example 1

[0035] A method for preparing a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller comprises the following steps:

[0036] S1. Weigh the raw materials according to the following weight percentages: graphene 3%, polytetrafluoroethylene 10%, paraffin oil 3%, polyvinylidene fluoride 10%, silane coupling agent 2%, maleic anhydride 2%, antioxidant 10101%, antioxidant 1681%, and the balance is high-density polyethylene. The sum of the weight percentages of the raw materials is 100%.

[0037] S2. Put graphene, polytetrafluoroethylene and paraffin oil into a high-speed mixer and mix them at high speed for 3 minutes to obtain a first mixture.

[0038] S3. Add polyvinylidene fluoride, silane coupling agent, antioxidant 1010, antioxidant 168, maleic anhydride and high-density polyethylene into a high-speed mixer and mix at high speed for 3 minutes to obtain a second mixture.

[0039] S4. After blending the second mixed material with the first mixed material, put them into a twin-screw extruder, and set different temperatures at equal intervals on the screw of the twin-screw extruder, specifically: 180°C, 200°C, 210°C, 230°C, 260°C, 230°C, 210°C, 200°C, 200°C, 200°C, and carry out melt shear dispersion under the conditions of 2MPa and shear rate of 300rpm to obtain a composite modified material.

[0040] S5. Put the composite modified material into an injection molding machine, set different temperatures at equal intervals on the screw, specifically: 180°C, 190°C, 200°C, 210°C, 220°C, after injection molding under a pressure of 10 MPa, place it in a hot press, and solidify it at a temperature of 220°C and a pressure of 4 MPa to obtain a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

[0041] Example 2

[0042] A method for preparing a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller comprises the following steps:

[0043] S1. Weigh the raw materials according to the following weight percentages: graphene 3%, polytetrafluoroethylene 10%, paraffin oil 3%, polyvinylidene fluoride 10%, silane coupling agent 2%, maleic anhydride 2%, antioxidant 10101%, antioxidant 1681%, and the balance is low-density linear polyethylene. The sum of the weight percentages of the raw materials is 100%.

[0044] S2. Put graphene, polytetrafluoroethylene and paraffin oil into a high-speed mixer and mix them at high speed for 3 minutes to obtain a first mixture.

[0045] S3. Add polyvinylidene fluoride, silane coupling agent, antioxidant 1010, antioxidant 168, maleic anhydride and low-density linear polyethylene into a high-speed mixer and mix at high speed for 3 minutes to obtain a second mixture.

[0046] S4. After blending the second mixed material with the first mixed material, put them into a twin-screw extruder, and set different temperatures at equal intervals on the screw of the twin-screw extruder, specifically: 180°C, 200°C, 210°C, 230°C, 260°C, 230°C, 210°C, 200°C, 200°C, 200°C, and carry out melt shear dispersion under the conditions of 2MPa and shear rate of 300rpm to obtain a composite modified material.

[0047] S5. Put the composite modified material into an injection molding machine, set different temperatures at equal intervals on the screw, specifically: 180°C, 190°C, 200°C, 210°C, 220°C, after injection molding under a pressure of 10 MPa, place it in a hot press, and solidify it at a temperature of 220°C and a pressure of 4 MPa to obtain a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

[0048] Example 3

[0049] A method for preparing a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller comprises the following steps:

[0050] S1. Weigh the raw materials according to the following weight percentages: graphene 3%, polytetrafluoroethylene 10%, paraffin oil 3%, polyvinylidene fluoride 10%, silane coupling agent 2%, maleic anhydride 2%, antioxidant 10101%, antioxidant 1681%, and the remainder is isotactic polypropylene. The sum of the weight percentages of the raw materials is 100%.

[0051] S2. Put graphene, polytetrafluoroethylene and paraffin oil into a high-speed mixer and mix them at high speed for 3 minutes to obtain a first mixture.

[0052] S3. Add polyvinylidene fluoride, silane coupling agent, antioxidant 1010, antioxidant 168, maleic anhydride and isotactic polypropylene into a high-speed mixer and mix at high speed for 3 minutes to obtain a second mixture.

[0053] S4. After blending the second mixed material with the first mixed material, put them into a twin-screw extruder, and set different temperatures at equal intervals on the screw of the twin-screw extruder, specifically: 180°C, 200°C, 210°C, 230°C, 300°C, 260°C, 230°C, 200°C, 200°C, 200°C, and carry out melt shear dispersion under the conditions of 3MPa and a shear rate of 300rpm to obtain a composite modified material.

[0054] S5. Put the composite modified material into an injection molding machine, set different temperatures at equal intervals on the screw, specifically: 180°C, 190°C, 200°C, 210°C, 220°C, after injection molding at a pressure of 15 MPa, place it in a hot press, and solidify it at a temperature of 220°C and a pressure of 4 MPa to obtain a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

[0055] Example 4

[0056] A method for preparing a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller comprises the following steps:

[0057] S1. Weigh the raw materials according to the following weight percentages: graphene 3.2%, polytetrafluoroethylene 9.5%, polyethylene wax oil 2.8%, polyvinylidene fluoride 10.5%, phthalate coupling agent 2.1%, diisopropylbenzene peroxide 2.1%, antioxidant 10101.1%, antioxidant 1680.9%, and the balance is low-density linear polyethylene. The sum of the weight percentages of the raw materials is 100%.

[0058] S2. Put graphene, polytetrafluoroethylene and polyethylene wax oil into a high-speed mixer and mix them at high speed for 3 minutes to obtain a first mixture.

[0059] S3. Add polyvinylidene fluoride, phthalate coupling agent, antioxidant 1010, antioxidant 168, dicumyl peroxide and isotactic polypropylene into a high-speed mixer and mix at high speed for 3 minutes to obtain a second mixture.

[0060] S4. After blending the second mixed material with the first mixed material, put them into a twin-screw extruder, and set different temperatures at equal intervals on the screw of the twin-screw extruder, specifically: 180°C, 200°C, 210°C, 230°C, 300°C, 230°C, 210°C, 200°C, 200°C, 200°C, and carry out melt shear dispersion under the conditions of 3MPa and shear rate of 300rpm to obtain a composite modified material.

[0061] S5. Put the composite modified material into an injection molding machine, set different temperatures at equal intervals on the screw, specifically: 180°C, 190°C, 200°C, 210°C, 220°C, after injection molding under a pressure of 5MPa, place it in a hot press, and solidify it at a temperature of 200°C and a pressure of 4MPa to obtain a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

[0062] Example 5

[0063] A method for preparing a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller comprises the following steps:

[0064] S1. Weigh the raw materials according to the following weight percentages: graphene 2.8%, polytetrafluoroethylene 10.5%, white oil 3.2%, polyvinylidene fluoride 9.5%, phthalate coupling agent 1.9%, ethylene-acrylate 1.9%, antioxidant 10100.9%, antioxidant 1681.1%, and the remainder is isotactic polypropylene. The sum of the weight percentages of the raw materials is 100%.

[0065] S2. Put graphene, polytetrafluoroethylene and white oil into a high-speed mixer and mix them at high speed for 3 minutes to obtain a first mixture.

[0066] S3. Add polyvinylidene fluoride, phthalate coupling agent, antioxidant 1010, antioxidant 168, ethylene acrylate and isotactic polypropylene into a high-speed mixer and mix at high speed for 3 minutes to obtain a second mixture.

[0067] S4. After blending the second mixed material with the first mixed material, put them into a twin-screw extruder, and set different temperatures at equal intervals on the screw of the twin-screw extruder, specifically: 180°C, 200°C, 210°C, 230°C, 260°C, 300°C, 260°C, 230°C, 200°C, 200°C, and carry out melt shear dispersion under the conditions of 2MPa and shear rate of 300rpm to obtain a composite modified material.

[0068] S5. Put the composite modified material into an injection molding machine, set different temperatures at equal intervals on the screw, specifically: 180°C, 190°C, 200°C, 210°C, 220°C, after injection molding at a pressure of 15 MPa, place it in a hot press, and solidify it at a temperature of 250°C and a pressure of 4 MPa to obtain a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

[0069] Comparative Example 1

[0070] A method for preparing a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller, which has the same preparation steps as those in Example 1, except that graphene is not used in the raw material, comprises the following steps:

[0071] S1. Weigh the raw materials according to the following weight percentages: polytetrafluoroethylene 10%, paraffin oil 3%, polyvinylidene fluoride 10%, silane coupling agent 2%, maleic anhydride 2%, antioxidant 10101%, antioxidant 1681%, and the balance is high-density polyethylene. The sum of the weight percentages of the raw materials is 100%.

[0072] S2. Put polytetrafluoroethylene and paraffin oil into a high-speed mixer and mix them at high speed for 3 minutes to obtain a first mixed material.

[0073] S3. Add polyvinylidene fluoride, silane coupling agent, antioxidant 1010, antioxidant 168, maleic anhydride and high-density polyethylene into a high-speed mixer and mix at high speed for 3 minutes to obtain a second mixture.

[0074] S4. After blending the second mixed material with the first mixed material, put them into a twin-screw extruder, and set different temperatures at equal intervals on the screw of the twin-screw extruder, specifically: 180°C, 200°C, 210°C, 230°C, 260°C, 230°C, 210°C, 200°C, 200°C, 200°C, and carry out melt shear dispersion under the conditions of 2MPa and shear rate of 300rpm to obtain a composite modified material.

[0075] S5. Put the composite modified material into an injection molding machine, set different temperatures at equal intervals on the screw, specifically: 180°C, 190°C, 200°C, 210°C, 220°C, after injection molding under a pressure of 10 MPa, place it in a hot press, and solidify it at a temperature of 220°C and a pressure of 4 MPa to obtain a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

[0076] Comparative Example 2

[0077] A method for preparing a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller, which has the same preparation steps as those in Example 2, except that graphene is not used in the raw material, and comprises the following steps:

[0078] S1. Weigh the raw materials according to the following weight percentages: polytetrafluoroethylene 10%, paraffin oil 3%, polyvinylidene fluoride 10%, silane coupling agent 2%, maleic anhydride 2%, antioxidant 10101%, antioxidant 1681%, and the balance is low-density linear polyethylene. The sum of the weight percentages of the raw materials is 100%.

[0079] S2. Put polytetrafluoroethylene and paraffin oil into a high-speed mixer and mix them at high speed for 3 minutes to obtain a first mixed material.

[0080] S3. Add polyvinylidene fluoride, silane coupling agent, antioxidant 1010, antioxidant 168, maleic anhydride and low-density linear polyethylene into a high-speed mixer and mix at high speed for 3 minutes to obtain a second mixture.

[0081] S4. After blending the second mixed material with the first mixed material, put them into a twin-screw extruder, and set different temperatures at equal intervals on the screw of the twin-screw extruder, specifically: 180°C, 200°C, 210°C, 230°C, 260°C, 230°C, 210°C, 200°C, 200°C, 200°C, and carry out melt shear dispersion under the conditions of 2MPa and shear rate of 300rpm to obtain a composite modified material.

[0082] S5. Put the composite modified material into an injection molding machine, set different temperatures at equal intervals on the screw, specifically: 180°C, 190°C, 200°C, 210°C, 220°C, and after injection molding at a pressure of 10 MPa, place it in a hot press and solidify it at a temperature of 220°C and a pressure of 4 MPa to obtain a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

[0083] Comparative Example 3

[0084] A method for preparing a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller, which has the same preparation steps as those in Example 3, except that graphene is not used in the raw material, comprises the following steps:

[0085] S1. Weigh the raw materials according to the following weight percentages: polytetrafluoroethylene 10%, paraffin oil 3%, polyvinylidene fluoride 10%, silane coupling agent 2%, maleic anhydride 2%, antioxidant 10101%, antioxidant 1681%, and the remainder is isotactic polypropylene. The sum of the weight percentages of the raw materials is 100%.

[0086] S2. Put polytetrafluoroethylene and paraffin oil into a high-speed mixer and mix them at high speed for 3 minutes to obtain a first mixed material.

[0087] S3. Add polyvinylidene fluoride, silane coupling agent, antioxidant 1010, antioxidant 168, maleic anhydride and isotactic polypropylene into a high-speed mixer and mix at high speed for 3 minutes to obtain a second mixture.

[0088] S4. After blending the second mixed material with the first mixed material, put them into a twin-screw extruder, and set different temperatures at equal intervals on the screw of the twin-screw extruder, specifically: 180°C, 200°C, 210°C, 230°C, 300°C, 260°C, 230°C, 200°C, 200°C, 200°C, and carry out melt shear dispersion under the conditions of 2MPa and a shear rate of 300rpm to obtain a composite modified material.

[0089] S5. Put the composite modified material into an injection molding machine, set different temperatures at equal intervals on the screw, specifically: 180°C, 190°C, 200°C, 210°C, 220°C, after injection molding at a pressure of 15 MPa, place it in a hot press, and solidify it at a temperature of 220°C and a pressure of 4 MPa to obtain a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

[0090] The obtained self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller (modified roller) was inspected to ensure that it has the performance of self-cleaning, self-lubricating and dust-suppressing and noise-reducing. The inspection method is real-time monitoring. The self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor rollers obtained in Examples 1-3 and Comparative Examples 1-3 are placed on the conveyor. The amount of dust on the surface and in the environment of the conveyor and the traditional roller (steel roller, Julu County Huirong Conveying Equipment Factory, 50mm×100mm) are observed at the same time. The degree of wear of the two is observed at the same time. The noise level of the conveyor during operation is compared using a decibel detector. By testing the two conveyors at the same time, the data obtained are as follows:

[0091] Table 1 Performance test results of the conveyor after running for 8 hours

[0092]

[0093] The results in Table 1 show that after modifying polyolefin by adding graphene, polytetrafluoroethylene and polyvinylidene fluoride, the amount of dust on the surface of the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller is reduced by more than 50%, the environmental dust concentration is reduced by more than 50%, the noise during equipment operation is reduced by more than 50%, and the wear resistance is improved by no less than 50%, which reflects that the wear resistance of the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller after modification is significantly improved; after comparison, the comprehensive performance of the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller with the addition of graphene is significantly improved.

[0094] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for preparing a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller, characterized in that: The following steps are involved: Weigh the raw materials according to the following weight percentages: graphene 3±0.2%, polytetrafluoroethylene 10±0.5%, polyvinylidene fluoride 10±0.5%, coupling agent 2±0.1%, compatibilizer 2±0.1%, and the balance is polyolefin, and the sum of the weight percentages of the raw materials is 100%; Mixing graphene and polytetrafluoroethylene to obtain a first mixed material; Mixing polyvinylidene fluoride, a coupling agent, a compatibilizer and polyolefin to obtain a second mixed material; After mixing the second mixed material with the first mixed material, melt shear dispersion is performed at 180-300° C. and 1-5 MPa to increase the content of β crystals in polyvinylidene fluoride to obtain a composite modified material; The composite modified material is sequentially subjected to injection molding and hot pressing to obtain a self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller.

2. The method for preparing the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller according to claim 1, characterized in that: The particle size of graphene is 10-20 nm, the particle size of polytetrafluoroethylene is 5-10 μm, and the particle size of polyvinylidene fluoride is 1-5 μm.

3. The method for preparing the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller according to claim 1, characterized in that: The polyolefin is selected from one or more of high-density polyethylene, linear low-density polyethylene, isotactic polypropylene, syndiotactic polypropylene and atactic polypropylene.

4. The method for preparing the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller according to claim 1, characterized in that: The compatibilizer is selected from one or more of maleic anhydride, dicumyl peroxide, ethylene-acrylate, and polyolefin elastomer.

5. The method for preparing the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller according to claim 1, characterized in that: The coupling agent is selected from a silane coupling agent or a phthalate coupling agent.

6. The method for preparing the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller according to claim 1, characterized in that: During the preparation of the first mixed material, a lubricant is added. The lubricant is selected from polyethylene wax oil, paraffin oil, white oil or vinyl bis-stearic acid amide. The mass percentage of the lubricant in the composite modified material is 3±0.2%.

7. The method for preparing the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller according to claim 1, characterized in that: During the preparation of the second mixture, an auxiliary agent is added. The auxiliary agent consists of antioxidant 1010 and antioxidant 168. The mass percentage of antioxidant 1010 and antioxidant 168 in the composite modified material is 1±0.1%.

8. The method for preparing the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller according to claim 1, characterized in that: The injection molding conditions are: 180-220°C, 5-15MPa.

9. The method for preparing the self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller according to claim 1, characterized in that: The conditions for hot pressing are: 200-250°C, 1-5MPa.

10. A self-cleaning, self-lubricating, dust-suppressing and noise-reducing conveyor roller made by the preparation method according to any one of claims 1 to 9.

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