CN111138839A - Graphene modified TPU conveyer belt and preparation method thereof - Google Patents
Graphene modified TPU conveyer belt and preparation method thereof Download PDFInfo
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- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/06—Polyurethanes from polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
- C08J5/124—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives using adhesives based on a macromolecular component
- C08J5/128—Adhesives without diluent
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- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/08—Polyurethanes from polyethers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
- B29L2031/7092—Conveyor belts
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- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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Abstract
The invention discloses a graphene modified TPU (thermoplastic polyurethane) conveying belt which is characterized by being formed by blending a thermoplastic polyurethane elastomer, graphene modified TPU granules and color master batches, wherein the blending ratio of the thermoplastic polyurethane elastomer, the graphene modified TPU granules and the color master batches is 100: 5-10: 1-5; wherein the graphene modified TPU granules contain 0.1-10 parts of silane coupling agent modified graphene based on the total amount of the graphene modified TPU granules. The invention has the beneficial effects that: through modifying graphite alkene, seek better mode and add into TPU to obtain the graphite alkene modification TPU conveyer belt that intensity is higher and toughness is better, make the turning radius of TPU conveyer belt reduce, thereby reduce conveying equipment's volume, wearability, oil resistance reinforcing has fine using value.
Description
Technical Field
The invention belongs to the field of conveyor belt preparation, and particularly relates to a graphene modified TPU conveyor belt and a preparation method thereof.
Background
With the rapid growth in equipment and production automation requirements, high quality, rapid drive delivery services are required. The TPU conveyor belt has the characteristics of higher tensile strength, good flexibility, light weight, thinness and the like which are not possessed by rubber, and is more and more widely applied to the industrial automation industry, such as being used for conveying steel plates and aluminum materials, and requiring the conveyor belt to improve the strength and the flexibility, the turning diameter of the conveyor belt can be reduced, and the energy consumption is reduced; and the cutting resistance and the mechanical oil resistance are improved, so that the aging resistance is improved, the service life of the conveying belt is prolonged, and the transmission cost is reduced.
However, the strength and toughness of the existing TPU conveying belt are in a pair of contradictions, and the TPU conveying belt has good strength and poor toughness, and the TPU conveying belt has good toughness and poor strength. Poor toughness requires an increase in the turning radius of the conveyor belt, which increases the size and cost of the conveyor.
Graphene is known to be one of the highest-strength materials known at present, and has good toughness and can be bent, the theoretical young modulus of graphene reaches 1.0TPa, and the inherent tensile strength is 130 Gpa. However, since graphene layers have strong van der waals force and are poorly dispersed in a polymer matrix, how to add graphene into a TPU conveyor belt to simultaneously improve the strength and toughness of the conveyor belt has been a problem in the industry.
At present, the graphene is not used for the production of TPU conveying belts. Moreover, the existing TPU conductive material is prepared by adding carbon nano tubes and conductive carbon black for copolymerization, the addition amount is 3-10%, the strength of the TPU conductive material is reduced by about 30-50% compared with that of the common TPU conductive material, and the TPU conductive material cannot effectively meet the requirements of a conveyer belt market.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the objects of the present invention is to provide a graphene modified TPU conveyor belt.
The second purpose of the invention is to provide a preparation method of the graphene modified TPU conveyor belt.
In order to realize one of the purposes of the invention, the adopted technical scheme is as follows:
the graphene modified TPU conveyor belt is formed by blending a thermoplastic polyurethane elastomer, graphene modified TPU granules and color master batches, wherein the blending ratio of the thermoplastic polyurethane elastomer, the graphene modified TPU granules and the color master batches is 100: 5-10: 1-5; wherein the graphene modified TPU granules contain 0.1-10 parts of silane coupling agent modified graphene based on the total amount of the graphene modified TPU granules.
In a preferred embodiment of the invention, the silane coupling agent modified graphene is prepared from the following components in parts by weight:
20-50 parts of ethanol;
1-3 parts of graphene;
0.5-2 parts of a silane coupling agent.
In a preferred embodiment of the present invention, the silane coupling agent is any one or more of KH550 or KH 560.
In a preferred embodiment of the present invention, the graphene modified TPU pellets further comprise the following components in parts by weight:
100 parts of polyol;
1-15 parts of a chain extender;
0.1-3 parts of an antioxidant;
0.01-1 part of a catalyst;
0.1-2 parts of a lubricant;
20-80 parts of isocyanate.
In a preferred embodiment of the present invention, the polyol is any one or more of polyester polyol or polyether polyol with molecular weight of 400-1000.
In a preferred embodiment of the present invention, the chain extender is any one or more of 1, 6-hexanediol, 1, 5-pentanediol, neopentyl glycol, 1, 4-butanediol, 1, 3-propanediol, or 1, 2-ethanediol or trimethylolpropane.
In a preferred embodiment of the present invention, the catalyst is any one or more of dibutyltin dilaurate or stannous octoate.
In a preferred embodiment of the invention, the antioxidant is any one or more of 2, 6-tertiary butyl-4-methylphenol or bis (3, 5-tertiary butyl-4-hydroxyphenyl) sulfide.
In a preferred embodiment of the present invention, the isocyanate is any one or more of diphenylmethylene diisocyanate, polymethylene polyphenyl isocyanate, toluene diisocyanate or isophorone diisocyanate.
In a preferred embodiment of the present invention, the lubricant is zinc stearate.
In a preferred embodiment of the invention, the thermoplastic polyurethane elastomer is a polyester or polyether TPU for extrusion having a hardness of 80-95A. Preferably, the thermoplastic polyurethane elastomer is of the same type as the polyol of the graphene modified TPU pellets.
In a preferred embodiment of the invention, the polyurethane coating further comprises a primer PU glue, wherein the primer PU glue is a solvent-free two-component polyurethane glue, one component is a polyurethane prepolymer containing NCO%, the other component is a composition containing hydroxyl, and the ratio of the one component to the second component is 1.8: 1.0.
In order to realize the second purpose of the invention, the adopted technical scheme is as follows:
a preparation method of a graphene modified TPU conveyer belt comprises the following steps:
graphene modification:
ultrasonically dispersing the graphene in the ethanol solution, adding the silane coupling agent, ultrasonically dispersing for about 1h, vacuumizing to remove the ethanol solvent, and drying to remove water to obtain the silane coupling agent modified graphene;
the preparation method of the graphene modified TPU granules comprises the following steps:
drying the graphene modified by the silane coupling agent, adding the graphene into the polyol melted and dewatered, uniformly stirring, adding the chain extender, the catalyst, the antioxidant and the lubricant, uniformly stirring, adding isocyanate, stirring, extruding and granulating to obtain the graphene modified TPU granules;
blending:
and uniformly mixing the thermoplastic polyurethane elastomer, the graphene modified TPU granules and the color master, dewatering, drying, blending, and forming a covering layer on the polyester fabric coated with the PU glue by adopting an extrusion calendering process to obtain the single-layer graphene modified TPU conveyer belt.
In a preferred embodiment of the present invention, the steps further comprise the steps of preparing a multi-layer TPU light weight conveyor belt:
coating PU glue on the reverse surface of the single-layer graphene modified TPU conveyer belt, attaching the single-layer graphene modified TPU conveyer belt to other graphene modified TPU conveyer belts at the temperature of 140-230 ℃ for 1.5-5 m/s and the tension of 150-220kg, and finishing and rolling to obtain the multi-layer graphene modified TPU conveyer belt.
In a preferred embodiment of the invention, the agitation is: stirring for 1-10 min at 60-115 ℃, wherein the extrusion is as follows: and (3) feeding the mixture into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 300-500rpm, the temperature is 150-200 ℃, reacting for 40-80min, and uniformly conveying the graphene modified TPU material through conveying, shearing and mixing of screws.
In a preferred embodiment of the invention, the thickness of the cover layer is 0.1-1 mm.
The invention has the beneficial effects that:
through modifying graphite alkene, seek better mode and add into TPU to obtain the graphite alkene modification TPU conveyer belt that intensity is higher and toughness is better, make the turning radius of TPU conveyer belt reduce, thereby reduce conveying equipment's volume, wearability, oil resistance reinforcing has fine using value.
Detailed Description
The main principle of the invention is as follows:
through the modification to graphene, the graphene can be well dispersed into TPU, the graphene modified TPU conveying belt material with higher strength and better toughness is obtained, the turning radius of the TPU conveying belt is reduced, the size of conveying equipment is reduced, and the graphene modified TPU conveying belt material has good application value. The method comprises the following specific steps:
after graphene is modified by a silane coupling agent, adding low-molecular-weight polyol in proportion, so that the viscosity is low, the graphene is easy to disperse and uniformly stirred, and the graphene modified TPU granules are prepared by polymerization reaction with isocyanate; and then the graphene is blended and extruded with the thermoplastic polyurethane elastomer in an extruder, and the graphene is effectively dispersed in the thermoplastic polyurethane elastomer through secondary blending, so that the advantages of the graphene are shown as much as possible, a TPU (thermoplastic polyurethane) conveying belt with high strength and without reducing toughness is obtained, the turning diameter of the conveying belt is reduced, the energy consumption is reduced, the service life of the conveying belt is prolonged, and the transmission cost is reduced.
Compared with the Chinese invention patent CN201710822011.1, the advantages of the invention are as follows:
graphene is simply modified, so that the graphene is easy to disperse in the synthesis of TPU elastomer materials; after graphene is modified, polyol with lower molecular weight is selected to prepare graphene modified TPU granules, so that the reaction viscosity is lower, the graphene is easy to disperse, and the graphene is stirred uniformly;
by adopting a double-screw extruder, the graphene modified TPU granules are dispersed in the TPU for the second time, so that the graphene is uniformly dispersed, and the problem that the polymerization reaction of the graphene is influenced in the synthesis of adding the TPU once and the performance of the TPU is reduced due to insufficient reaction is avoided; the preparation method has simple process;
due to the effective dispersion of the graphene, the mechanical property of the TPU is obviously improved, and particularly, the strength and the flexibility are obviously improved at the same time;
the TPU conveyor belt is prepared from the graphene modified TPU material, so that the flexibility of the TPU conveyor belt is improved, the turning diameter of the conveyor belt can be reduced, and the energy consumption is reduced;
the TPU conveyer belt with high bonding strength is prepared by adopting solvent-free bi-component polyurethane glue for bonding, is environment-friendly, effectively avoids the layering of the conveyer belt, and prolongs the service life.
The present invention will be described in detail with reference to specific examples.
Example 1:
(1) preparation of graphene modified TPU granules
And ultrasonically dispersing 1g of graphene in 10g of ethanol solution, then adding 0.5gKH550 for ultrasonic dispersion for about 1h, vacuumizing to remove the ethanol solvent, and drying to remove water to obtain the silane coupling agent modified graphene.
Adding 7.25g of silane coupling agent modified graphene into 100g of melt-dewatered poly (1, 4-butylene glycol) glycol (molecular weight 600), uniformly stirring, adding 0.72g of 1, 4-butanediol, 0.0145g of dibutyltin dilaurate, 0.75g of 2, 6-tertiary butyl-4-methylphenol and 0.14g of zinc stearate, uniformly stirring, adding into a double-screw premixing machine set, adding 45.3g of MDI, stirring for 5min at 115 ℃, sending into a double-screw extruder, reacting for 80min at the rotating speed of 400rpm and the temperature of 190 ℃, conveying, shearing and mixing by a screw, uniformly conveying the graphene modified TPU material, and then carrying out underwater dicing to obtain the graphene modified TPU granules.
(2) Preparing a graphene modified TPU conveying belt:
1. carrying out heat setting treatment on the polyester framework fabric for preparing the light conveyor belt, and priming PU glue;
2. the polyester polyurethane particles are uniformly mixed, the hardness is 90A and 100Kg, 2.5Kg of graphene modified TPU granules and 2Kg of color master batch are obtained in the step (1), the mixture is subjected to dewatering and drying, a blending process is carried out, an extrusion calendering process is adopted, the temperature is controlled to be 190 ℃, a covering layer is formed on the polyester fabric coated with the PU glue, the thickness is 0.2mm, and the content of the graphene is 0.1%.
3, on the surface of the shaped polyester framework fabric obtained in the step 1, carrying out extrusion calendering on the single-layer PU coating prepared in the step ② according to the thickness requirement of a conveyer belt to obtain a TPU coating, then coating PU glue on the back surface of the TPU coating, controlling the temperature to be 180 ℃, attaching the PU glue to the TPU coating of the other conveyer belt prepared in the step ②, wherein the tension is 195Kg, the machine running speed is 2m/s, and finishing and rolling to obtain the double-layer TPU light conveyer belt;
the TPU belt prepared in the above example step (2) without graphene addition was taken as comparative example 1.
Example 2:
(1) preparation of graphene modified TPU granules
And ultrasonically dispersing 1g of graphene in 12g of ethanol solution, adding 1gKH560 for ultrasonic dispersion for about 1h, vacuumizing to remove the ethanol solvent, and drying to remove water to obtain the silane coupling agent modified graphene.
Adding 10g of silane coupling agent modified graphene into 100g of melted and dehydrated polypropylene glycol (molecular weight is 400), uniformly stirring, adding 2.97g of 1, 2-ethylene glycol, 0.015g of dibutyltin dilaurate, 0.80g of 2, 6-tertiary butyl-4-methylphenol and 0.15g of zinc stearate, uniformly stirring, adding into a double-screw premixing unit, adding 50.5g of TDI, stirring for 8min at 110 ℃, feeding into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 500rpm, the temperature is 175 ℃, reacting for 70min, conveying, shearing and mixing by a screw, uniformly conveying the graphene modified TPU material, and carrying out underwater dicing to obtain the graphene modified TPU granules.
(2) Preparing a graphene modified TPU conveying belt:
1. carrying out heat setting treatment on the polyester framework fabric for preparing the light conveyor belt, and priming PU glue;
2. the polyether polyurethane particles are uniformly mixed, the hardness is 85A and 100Kg, 5Kg of graphene modified TPU granules and 3Kg of color master batch are obtained in the step (1), the mixture is subjected to dewatering and drying, blending is carried out, an extrusion calendering process is adopted, the temperature is controlled to be 185 ℃, a covering layer is formed on the polyester fabric coated with the PU glue, the thickness is 0.15mm, and the content of graphene is 0.28%.
3, on the surface of the shaped polyester framework fabric obtained in the step 1, carrying out extrusion calendering on the single-layer PU coating prepared in the step ② according to the thickness requirement of a conveying belt to obtain a TPU coating, then coating PU glue on the back surface of the TPU coating, controlling the temperature to be 175 ℃, attaching the PU glue to the TPU coating of the other conveying belt prepared in the step ②, wherein the tension is 200Kg, the machine running speed is 2.5m/s, and finishing and rolling to obtain the double-layer TPU light conveying belt;
taking the example step (2) above without adding graphene, the prepared TPU conveyer belt is comparative example 2.
Example 3:
(1) preparation of graphene modified TPU granules
And ultrasonically dispersing 1g of graphene in 15g of ethanol solution, then adding 0.8gKH550 to ultrasonically disperse for about 0.8h, vacuumizing to remove the ethanol solvent, and drying to remove water to obtain the silane coupling agent modified graphene.
Adding 20g of silane coupling agent modified graphene into 100g of melt-dewatered poly (1, 4-butylene glycol) glycol adipate (with the molecular weight of 1000), uniformly stirring, adding 1g of 1, 4-butanediol, 0.1g of dibutyltin dilaurate, 1g of 2, 6-tertiary butyl-4-methylphenol and 0.5g of zinc stearate, uniformly stirring, adding into a double-screw premixing machine set, adding 25g of MDI, stirring at 115 ℃ for 10min, feeding into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 500rpm, the temperature is 200 ℃, reacting for 80min, conveying, shearing and mixing by screws, uniformly conveying graphene modified TPU materials, and then carrying out underwater dicing to obtain the graphene modified TPU granules.
(2) Preparing a graphene modified TPU conveying belt:
1. carrying out heat setting treatment on the polyester framework fabric for preparing the light conveyor belt, and priming PU glue;
2. 100Kg of polyester polyurethane with the hardness of 90A, 15Kg of graphene modified TPU granules and 2Kg of color master batch in the step (1), uniformly mixing, dewatering, drying, blending, and forming a covering layer on the polyester fabric coated with the PU glue by adopting an extrusion calendering process at the temperature of 195 ℃, wherein the thickness is 1mm, and the content of the graphene is 1.5%.
3. On the surface of the shaped polyester framework fabric obtained in the step 1, adopting an extrusion calendering process to the single-layer PU coating prepared in the step ② according to the thickness requirement of a conveyer belt to obtain a TPU coating, then coating PU glue on the back surface of the TPU coating, controlling the temperature to be 195 ℃, attaching the TPU coating of the other conveyer belt prepared in the step ②, wherein the tension is 180Kg, the machine running speed is 2.1m/s, and finishing and rolling to obtain the double-layer TPU light conveyer belt;
taking the example above, step (2), without adding graphene, the prepared TPU belt was comparative example 3.
Data comparison for examples and comparative examples is shown in table 1:
TABLE 1
Claims (9)
1. The graphene modified TPU conveyer belt is characterized by being formed by blending a thermoplastic polyurethane elastomer, graphene modified TPU granules and color master batches, wherein the blending ratio of the thermoplastic polyurethane elastomer to the graphene modified TPU granules to the color master batches is 100: 5-10: 1-5; wherein the graphene modified TPU granules contain 0.1-10 parts of silane coupling agent modified graphene based on the total amount of the graphene modified TPU granules.
2. The graphene-modified TPU conveyor belt of claim 1, wherein the silane coupling agent-modified graphene is prepared from the following components in parts by weight:
20-50 parts of ethanol;
1-3 parts of graphene;
0.5-2 parts of a silane coupling agent.
3. The graphene-modified TPU conveyor belt of claim 1, wherein the silane coupling agent is any one or more of KH550 or KH 560.
4. The graphene modified TPU belt of any one of claims 1 to 3 wherein the graphene modified TPU pellets further comprise, in parts by weight:
100 parts of polyol;
1-15 parts of a chain extender;
0.1-3 parts of an antioxidant;
0.01-1 part of a catalyst;
0.1-2 parts of a lubricant;
20-80 parts of isocyanate.
5. The graphene modified TPU conveyor belt of claim 4, further comprising a primer PU glue, wherein the primer PU glue is a solventless bi-component polyurethane glue, one component is a polyurethane prepolymer containing NCO%, the other component is a composition containing hydroxyl, and the ratio of the one component to the second component is 1.8: 1.0.
6. The method for preparing the graphene modified TPU conveyer belt of any one of claims 1 to 5, which is characterized by comprising the following steps:
graphene modification:
ultrasonically dispersing the graphene in the ethanol solution, adding the silane coupling agent, ultrasonically dispersing for about 1h, vacuumizing to remove the ethanol solvent, and drying to remove water to obtain the silane coupling agent modified graphene;
the preparation method of the graphene modified TPU granules comprises the following steps:
drying the graphene modified by the silane coupling agent, adding the graphene into the polyol melted and dewatered, uniformly stirring, adding the chain extender, the catalyst, the antioxidant and the lubricant, uniformly stirring, adding isocyanate, stirring, extruding and granulating to obtain the graphene modified TPU granules;
blending:
and uniformly mixing the thermoplastic polyurethane elastomer, the graphene modified TPU granules and the color master, dewatering, drying, blending, and forming a covering layer on the polyester fabric coated with the PU glue by adopting an extrusion calendering process to obtain the single-layer graphene modified TPU conveyer belt.
7. The method for preparing the graphene modified TPU belt of claim 6, wherein the steps further comprise the steps of preparing a multi-layer TPU light belt:
coating PU glue on the reverse surface of the single-layer graphene modified TPU conveyer belt, attaching the single-layer graphene modified TPU conveyer belt to other graphene modified TPU conveyer belts at the temperature of 140-230 ℃ for 1.5-5 m/s and the tension of 150-220kg, and finishing and rolling to obtain the multi-layer graphene modified TPU conveyer belt.
8. The method for preparing the graphene modified TPU conveyor belt of claim 6, wherein the stirring is: stirring for 1-10 min at 60-115 ℃, wherein the extrusion is as follows: and (3) feeding the mixture into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 300-500rpm, the temperature is 150-200 ℃, reacting for 40-80min, and uniformly conveying the graphene modified TPU material through conveying, shearing and mixing of screws.
9. The method of claim 6, wherein the cover layer has a thickness of 0.1 mm to 1 mm.
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