Preparation method and application of TPU plastic runway material

Abstract

The invention discloses a preparation method and application of a TPU plastic runway material, and relates to the technical field of plastic runways, the preparation method comprises the following steps: step 1, preparation of modified bamboo fiber powder: taking fresh moso bamboos, cutting the taken moso bamboos into strips or sheets, soaking the moso bamboos in an alkaline solution, cooking the moso bamboos at a high temperature, filtering, washing and grinding the moso bamboos to obtain bamboo fiber powder; dispersing the bamboo fiber powder into an activating solvent, and activating to obtain modified bamboo fiber powder; step 2, combining a formula: preparing raw materials from 28-36 parts by weight of polyether polyol, 20-22 parts by weight of diisocyanate, 3-5 parts by weight of modified bamboo fiber powder and 1-3 parts by weight of a high-molecular polymer; step 3, component mixing: mixing the raw materials, and preheating to obtain a preheated mixed material; and step 4, extrusion and granulation: introducing the preheated mixed material into a screw extruder, and carrying out melting, foaming, extrusion and granulation to obtain TPU plastic track material particles. The composite material has the effects of resisting aging, reducing the use cost and balancing the rebound resilience and the strength.

Description

Technical Field

[0001] The present application relates to the technical field of plastic runways, and in particular to a preparation method and application of a TPU plastic runway material. Background Art

[0002] Existing sports field plastic materials generally use polyurethane elastic technology. During the paving process, construction workers mix polyurethane prepolymers generated by polyether polyols and isocyanates, as well as various polyether polyols, amine chain extenders, powders, etc. to make prepolymers for paving, completing the construction of roads and venues.

[0003] In the prior art, it is difficult to balance the resilience and strength of conventional TPU mixed materials during the laying and use of outdoor plastic tracks. When the strength is high, it affects the resilience requirements during use, and when the high resilience is satisfied, there is a problem of insufficient strength. In addition, the weather resistance is poor, and it is impossible to achieve long-term effective use, which in turn affects the normal use of the plastic track and has an adverse impact on the maintenance and maintenance costs, which needs to be improved. Summary of the invention

[0004] In view of this, the first purpose of this application is to provide a method for preparing TPU plastic track material to achieve the purpose of anti-aging, reducing use costs and balancing resilience and strength. The specific scheme is as follows: A method for preparing a TPU plastic track material comprises the following steps: Step 1, preparation of modified bamboo fiber powder: fresh bamboo is cut into strips or sheets, and then sequentially soaked in an alkaline solution, cooked at high temperature, filtered, washed and ground to obtain bamboo fiber powder; the bamboo fiber powder is then dispersed in an activation solvent, and modified bamboo fiber powder is obtained after activation treatment; Step 2, combination formula: prepare raw materials according to weight parts of 28-36 parts of polyether polyol, 20-22 parts of diisocyanate, 3-5 parts of modified bamboo fiber powder and 1-3 parts of high molecular polymer; Step 3, mixing components: mixing the raw materials, preheating, and obtaining a preheated mixed material; Step 4: Extrusion granulation: The preheated mixed material is introduced into a screw extruder, and TPU plastic track material particles are obtained through melting, foaming, extrusion and granulation.

[0005] Preferably, the activation solvent comprises 5-12 parts by weight of chitosan, 3-5 parts of chloroacetic acid, 12-20 parts of ether and 50-70 parts of deionized water; and the chitosan is a modified composite chitosan modified by a silane coupling agent.

[0006] Preferably: the preparation method of the modified composite chitosan comprises the steps of ① mixing graphene and nano zinc oxide in a mass ratio of 1:2-4, adding 2wt% KH-570 in a mass percentage to obtain a composite modified body; ② mixing the composite modified body with a chitosan solution in a mass ratio of 2-3:1 to obtain a viscous precursor; and ③ drying the viscous precursor at low temperature to obtain.

[0007] Preferably: the polyether polyol comprises a polyether polyol with a molecular weight of 3000 and a polyether polyol with a molecular weight of 600 in a mass percentage of 2:1-2; and the polyether polyol is purchased from Guangzhou Yinghong Chemical Co., Ltd.

[0008] Preferably: the diisocyanate is xylene diisocyanate, and is purchased from Shandong Xuchen Chemical Technology Co., Ltd.

[0009] Preferably, in step 1, the alkaline solution is immersed in a calcium hydroxide, magnesium hydroxide or sodium hydroxide aqueous solution with a temperature controlled at 42-45° C., and the pH of the alkaline solution is controlled at 9-11.

[0010] Preferably: in step 1, the high temperature cooking is to control the temperature to 80-90°C, cook for 2-5 hours, put into the cooking liquid for 1 hour after steaming for 1 hour, and replace the cooking liquid before putting into the cooking liquid, the cooking liquid is an alkaline solution with a pH greater than 7 and less than 10, and the alkaline solution is prepared by sodium bicarbonate and / or sodium hydroxide and water.

[0011] Preferably, the high molecular polymer is selected from one or more of polypropylene, polyethylene, polystyrene, polyvinyl chloride and polyphenylene ether.

[0012] The second object of the present invention is to provide an application of a TPU plastic track material prepared by the preparation method of the TPU plastic track material as described above in a track, a ramp and a non-motorized vehicle lane.

[0013] Preferably: the preparation method of the runway, ramp or non-motorized vehicle lane comprises mixing 50-80 parts by weight of TPU plastic runway material, 25-70 parts of filler and 3-6 parts of antioxidant, and then introducing them into a screw extruder to extrude into a coil and lay the coil road; the filler is calcium carbonate, talcum powder, clay, mica powder, titanium dioxide, indium tin oxide, antimony tin oxide or aluminum zinc oxide; the antioxidant is 3-tert-butyl-4-hydroxyanisole, 2-tert-butyl-4-hydroxyanisole, 2,6-di-tert-butyl-4-methylphenol, Fischer-Tropsch synthesis liquid wax, aromatic diamine, hindered phenol or octylbutyl diphenylamine; the temperature of the screw extruder is 220-250°C; the thickness of the coil is greater than or equal to 13 mm.

[0014] It can be seen from the above scheme that the present application provides a preparation method and application of a TPU plastic runway material, and the preparation method and application of the TPU plastic runway material have the following beneficial effects: 1. The active groups in the modified bamboo fiber powder obtained by fresh bamboo are combined with polyether polyol and diisocyanate, and then supplemented with high molecular polymers to improve the mechanical strength of the prepared TPU plastic track material while avoiding affecting the rebound performance, and the cost is low, so that the obtained TPU plastic track material not only optimizes the performance, but also achieves the purpose of effectively controlling the cost; 2. The viscous liquid formed by chitosan is combined with chloroacetic acid and ether to fully activate the bamboo fiber powder, so that the modified bamboo fiber powder obtained by the activation treatment can achieve a synergistic reaction with polyether polyol and diisocyanate, while improving the mechanical strength of the prepared TPU plastic track material and optimizing the rebound performance; 3. The TPU plastic runway material prepared by the preparation method of the TPU plastic runway material has the advantages of significantly improving the compatibility between the modified bamboo fiber powder and the polyether polyol, diisocyanate and high molecular polymer through surface activation, effectively improving the material mechanical strength of the TPU plastic runway material, and providing sufficient elastic performance when used in runways, ramps and non-motorized vehicle lanes; 4. By improving the balance between resilience and strength, the shock absorption effect is improved while achieving wear resistance and impact resistance. When used in runways, ramps and non-motorized vehicle lanes, the maintenance difficulty and cost are significantly reduced, and the anti-slip and anti-aging properties are improved, thereby effectively extending the service life. DETAILED DESCRIPTION

[0015] The following will be clearly and completely described in conjunction with the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0016] The following is a detailed description of the preparation method and application of the TPU plastic track material of the present application.

[0017] A method for preparing a TPU plastic track material comprises the following steps: Step 1, preparation of modified bamboo fiber powder: take fresh bamboo and cut it into strips or sheets, then soak it in an alkaline solution, cook it at high temperature, filter, wash and grind it in sequence to obtain bamboo fiber powder; then disperse the bamboo fiber powder in an activation solvent, and obtain modified bamboo fiber powder after activation treatment, and when soaking in the alkaline solution, use a calcium hydroxide, magnesium hydroxide or sodium hydroxide aqueous solution with a temperature controlled at 42-45°C, and control the pH of the alkaline solution to 9-11; when cooking at high temperature, control the temperature to 80-90°C, cook for 2-5h, and after steaming for 1h, place it in a cooking liquid for 1h circulation, and replace the cooking liquid before placing it in the cooking liquid, the cooking liquid is an alkaline solution with a pH greater than 7 and less than 10, and the alkaline solution is prepared by sodium bicarbonate and / or sodium hydroxide and water; Step 2, combination formula: prepare raw materials according to weight parts of 28-36 parts of polyether polyol, 20-22 parts of diisocyanate, 3-5 parts of modified bamboo fiber powder and 1-3 parts of high molecular polymer; Step 3, mixing components: mixing the raw materials, preheating, and obtaining a preheated mixed material; Step 4: Extrusion granulation: The preheated mixed material is introduced into a screw extruder, and TPU plastic track material particles are obtained through melting, foaming, extrusion and granulation.

[0018] The activation solvent comprises 5-12 parts of chitosan, 3-5 parts of chloroacetic acid, 12-20 parts of ether and 50-70 parts of deionized water by weight; the chitosan is a modified composite chitosan modified by a silane coupling agent. The preparation method of the modified composite chitosan comprises the steps of ① mixing graphene and nano zinc oxide in a mass ratio of 1:2-4, adding 2wt% of KH-570 by mass percentage, and obtaining a composite modified body; ② mixing the composite modified body with a chitosan solution in a mass ratio of 2-3:1 to obtain a viscous precursor; and ③ drying the viscous precursor at low temperature to obtain.

[0019] At the same time, in order to effectively combine polyether polyol, diisocyanate and modified bamboo fiber powder, the polyether polyol used in the embodiment of the present application includes a polyether polyol with a molecular weight of 3000 and a polyether polyol with a molecular weight of 600 in a mass percentage of 2:1-2; and the polyether polyols are purchased from Guangzhou Yinghong Chemical Co., Ltd. The diisocyanate is ditoluene diisocyanate, and is purchased from Shandong Xuchen Chemical Technology Co., Ltd. The high molecular polymer is selected from one or more of polypropylene, polyethylene, polystyrene, polyvinyl chloride, and polyphenylene ether.

[0020] A method for preparing the TPU plastic track material as described above is used in tracks, ramps and non-motorized vehicle lanes.

[0021] The preparation method of the runway, ramp or non-motorized vehicle lane comprises mixing 50-80 parts by weight of TPU plastic runway material, 25-70 parts of filler and 3-6 parts of antioxidant, introducing the mixture into a screw extruder to extrude the mixture into a coil and laying the coil on a road.

[0022] In the present application embodiment, the filler is calcium carbonate, talcum powder, clay, mica powder, titanium dioxide, indium tin oxide, antimony tin oxide or aluminum zinc oxide. The antioxidant is 3-tert-butyl-4-hydroxyanisole, 2-tert-butyl-4-hydroxyanisole, 2,6-di-tert-butyl-4-methylphenol, Fischer-Tropsch synthesis liquid wax, aromatic diamine, hindered phenol or octyl butyl diphenylamine. The temperature of the screw extruder is 220-250°C, and the thickness of the coil is greater than or equal to 13mm. At the same time, in order to test and compare the performance of the coil, the thickness of the coil in the present application embodiment is controlled to be 13mm. Of course, in the actual application process, the thickness of the coil can also be 13.5, 14, 15, 16, etc., which will not be repeated here.

[0023] Embodiment 1 A method for preparing a TPU plastic track material comprises the following steps: Step 1, preparation of modified bamboo fiber powder: take fresh bamboo and cut it into strips or sheets, and then soak it in an alkaline solution, cook it at high temperature, filter, wash and grind it in sequence to obtain bamboo fiber powder; then disperse the bamboo fiber powder in an activation solvent, and obtain modified bamboo fiber powder after activation treatment, and when soaking in the alkaline solution, use a calcium hydroxide aqueous solution with a temperature controlled at 42°C, and control the pH of the alkaline solution to 9; when cooking at high temperature, control the temperature to 80°C, cook for 2 hours, and after steaming for 1 hour, place it in the cooking liquid for 1 hour, and circulate it, and replace the cooking liquid before placing it in the cooking liquid, the cooking liquid is an alkaline solution with a pH of 8, and the alkaline solution is prepared by sodium bicarbonate and water.

[0024] Step 2, combination formula: prepare raw materials by weight of 28 parts of polyether polyol, 20 parts of diisocyanate, 3 parts of modified bamboo fiber powder and 1 part of polypropylene.

[0025] Step 3: Mix the raw materials and preheat them to obtain preheated mixed materials. Step 4: Extrusion granulation: The preheated mixed material is introduced into a screw extruder, and TPU plastic track material particles are obtained through melting, foaming, extrusion and granulation.

[0026] The activation solvent includes 5 parts of chitosan, 3 parts of chloroacetic acid, 12 parts of ether and 50 parts of deionized water by weight. The chitosan is a modified composite chitosan modified by a silane coupling agent. The preparation method of the modified composite chitosan includes the steps of ① mixing graphene and nano zinc oxide in a mass ratio of 1:2, adding 2wt% of KH-570 by mass percentage to obtain a composite modified body; ② mixing the composite modified body with a chitosan solution in a mass ratio of 2:1 to obtain a viscous precursor; and ③ drying the viscous precursor at low temperature to obtain.

[0027] At the same time, in order to effectively combine the polyether polyol, diisocyanate and modified bamboo fiber powder, the polyether polyol used in the embodiment of the present application includes a polyether polyol with a molecular weight of 3000 and a polyether polyol with a molecular weight of 600 in a mass percentage of 2:1. The diisocyanate is ditoluene diisocyanate.

[0028] A method for preparing the TPU plastic track material as described above is used in tracks, ramps and non-motorized vehicle lanes.

[0029] Among them, the preparation method of the runway, ramp or non-motorized vehicle lane includes mixing 50 parts by weight of TPU plastic runway material, 25 parts of calcium carbonate, and 3 parts of 3-tert-butyl-4-hydroxyanisole, and then introducing them into a screw extruder to extrude into a coil and lay the coil road. The temperature of the screw extruder is controlled to be 220-250°C, and the thickness of the coil is 13mm. The temperature zone of the screw extruder is adjusted according to product requirements, which will not be repeated here.

[0030] Embodiment 2 A method for preparing a TPU plastic track material comprises the following steps: Step 1, preparation of modified bamboo fiber powder: take fresh bamboo and cut it into strips or sheets, and then soak it in an alkaline solution, cook it at high temperature, filter, wash and grind it in sequence to obtain bamboo fiber powder; then disperse the bamboo fiber powder in an activation solvent, and obtain modified bamboo fiber powder after activation treatment, and when soaking in the alkaline solution, use a magnesium hydroxide aqueous solution with a temperature controlled at 43°C, and control the pH of the alkaline solution to 10; when cooking at high temperature, control the temperature to 85°C, cook for 3 hours, and after steaming for 1 hour, place it in the cooking liquid for 1 hour, and circulate it, and replace the cooking liquid before placing it in the cooking liquid, the cooking liquid is an alkaline solution with a pH of 9, and the alkaline solution is prepared by sodium hydroxide and water.

[0031] Step 2, combination formula: prepare raw materials by weight of 30 parts of polyether polyol, 21 parts of diisocyanate, 4 parts of modified bamboo fiber powder and 1.3 parts of polyethylene.

[0032] Step 3, mixing components: mixing the raw materials, preheating, and obtaining a preheated mixed material.

[0033] Step 4: Extrusion granulation: The preheated mixed material is introduced into a screw extruder, and TPU plastic track material particles are obtained through melting, foaming, extrusion and granulation.

[0034] The activation solvent includes 9 parts of chitosan, 4 parts of chloroacetic acid, 15 parts of ether and 60 parts of deionized water by weight. The chitosan is a modified composite chitosan modified by a silane coupling agent. The preparation method of the modified composite chitosan includes the steps of ① mixing graphene and nano zinc oxide in a mass ratio of 1:3, adding 2wt% of KH-570 by mass percentage to obtain a composite modified body; ② mixing the composite modified body with a chitosan solution in a mass ratio of 2.5:1 to obtain a viscous precursor; and ③ drying the viscous precursor at low temperature to obtain.

[0035] At the same time, in order to effectively combine the polyether polyol, diisocyanate and modified bamboo fiber powder, the polyether polyol used in the embodiment of the present application includes a polyether polyol with a molecular weight of 3000 and a polyether polyol with a molecular weight of 600 in a mass percentage of 2:1.5. The diisocyanate is xylene diisocyanate.

[0036] A method for preparing the TPU plastic track material as described above is used in tracks, ramps and non-motorized vehicle lanes.

[0037] Among them, the preparation method of the runway, ramp or non-motorized vehicle lane includes mixing 65 parts by weight of TPU plastic runway material, 50 parts by weight of calcium carbonate, and 5 parts by weight of 2-tert-butyl-4-hydroxyanisole, and then introducing them into a screw extruder to extrude them into a coil and lay the coil road.

[0038] The temperature of the screw extruder is 220-250°C, and the thickness of the coil is 13 mm. The temperature zone of the screw extruder is adjusted according to product requirements and will not be described here.

[0039] Embodiment 3 A method for preparing a TPU plastic track material comprises the following steps: Step 1, preparation of modified bamboo fiber powder: take fresh bamboo and cut it into strips or sheets, and then soak it in an alkaline solution, cook it at high temperature, filter, wash and grind it in sequence to obtain bamboo fiber powder; then disperse the bamboo fiber powder in an activation solvent, and obtain modified bamboo fiber powder after activation treatment, and when soaking in the alkaline solution, use a sodium hydroxide aqueous solution with a temperature controlled at 45°C, and control the pH of the alkaline solution to 11; when cooking at high temperature, control the temperature to 90°C, cook for 5 hours, and after steaming for 1 hour, place it in the cooking liquid for 1 hour to circulate, and replace the cooking liquid before placing it in the cooking liquid. The cooking liquid is an alkaline solution with a pH of 10, and the alkaline solution is prepared by sodium bicarbonate, sodium hydroxide and water, and the sodium bicarbonate and sodium hydroxide are composed of a mass ratio of 1:2. Of course, they can also be mixed in any mass ratio, which will not be elaborated here.

[0040] Step 2, combination formula: prepare raw materials by weight of 36 parts of polyether polyol, 22 parts of diisocyanate, 5 parts of modified bamboo fiber powder and 3 parts of polyphenylene ether.

[0041] Step 3, mixing components: mixing the raw materials, preheating, and obtaining a preheated mixed material.

[0042] Step 4: Extrusion granulation: The preheated mixed material is introduced into a screw extruder, and TPU plastic track material particles are obtained through melting, foaming, extrusion and granulation.

[0043] The activation solvent includes 12 parts of chitosan, 5 parts of chloroacetic acid, 20 parts of ether and 70 parts of deionized water by weight; the chitosan is a modified composite chitosan modified by a silane coupling agent. The preparation method of the modified composite chitosan includes the steps of ① mixing graphene and nano zinc oxide at a mass ratio of 1:4, adding 2wt% of KH-570 by mass percentage to obtain a composite modified body; ② mixing the composite modified body with a chitosan solution at a mass ratio of 3:1 to obtain a viscous precursor; and ③ drying the viscous precursor at low temperature to obtain.

[0044] At the same time, in order to effectively combine the polyether polyol, diisocyanate and modified bamboo fiber powder, the polyether polyol used in the embodiment of the present application includes a polyether polyol with a molecular weight of 3000 and a polyether polyol with a molecular weight of 600 in a mass percentage of 1:1. The diisocyanate is ditoluene diisocyanate.

[0045] A method for preparing the TPU plastic track material as described above is used in tracks, ramps and non-motorized vehicle lanes.

[0046] The preparation method of the runway, ramp or non-motorized vehicle lane includes mixing 80 parts by weight of TPU plastic runway material, 70 parts by weight of calcium carbonate and 6 parts by weight of octylbutyl diphenylamine, introducing the mixture into a screw extruder to extrude the mixture into a coil and laying the coil on a road.

[0047] The temperature of the screw extruder is 220-250°C, and the thickness of the coil is 13 mm. The temperature zone of the screw extruder is adjusted according to product requirements and will not be described here.

[0048] Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that in Comparative Example 1, bamboo fiber powder is used instead of modified bamboo fiber powder.

[0049] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that in Comparative Example 2, chitosan purchased from Henan Jinchengde Biotechnology Co., Ltd. is used to replace the modified composite chitosan.

[0050] Comparative Example 3 The difference between Comparative Example 3 and Example 2 is that the amount of modified bamboo fiber powder added in Comparative Example 3 is 1 part.

[0051] Performance Testing: 1. According to GB36246-2018 "Synthetic Surface Sports Fields for Primary and Secondary Schools", the impact absorption, tensile strength, tensile elongation and vertical deformation are tested; 2. Use 200uW / cm 2 After 500 hours of ultraviolet irradiation, the tensile strength and elongation were tested.

[0052] The performance test results of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 1 and Table 2 below.

[0053] Table 1 Mechanical properties test results

[0054] Table 2 Anti-aging performance test results

[0055] As can be seen from Example 2, Comparative Example 1 and Comparative Example 2 in Table 1 above, by adding modified bamboo fiber powder, the modified bamboo fiber powder that is fully activated can significantly improve the compatibility with polyether polyols and diisocyanates while further improving the structural strength and achieving balanced resilience. Based on Example 2 and Comparative Example 3, it can be seen that when the amount of modified bamboo fiber powder added is insufficient, it is difficult to achieve an effective performance improvement effect. The core of this is that the modified bamboo fiber powder is too dispersed in the composition, and it is difficult to effectively stimulate the cross-linking effect between the components, which in turn affects the mechanical strength and resilience of the obtained TPU plastic track material for the coil.

[0056] As can be seen from Table 2 above, the selection of chitosan has little effect on the anti-aging ability of the coiled material, but the fully activated bamboo fiber powder has the effect of improving the structural strength between the components. The formed three-dimensional network structure can effectively block ultraviolet radiation while providing sufficient rebound performance, so that the TPU plastic track material prepared by the preparation method of the TPU plastic track material can achieve anti-aging, reduce the use cost and balance the resilience and strength when used in runways, ramps and non-motorized vehicle lanes.

[0057] In summary, the present application provides a preparation method and application of a TPU plastic track material. The preparation method of the TPU plastic track material combines the active groups in the modified bamboo fiber powder obtained by fresh bamboo with polyether polyols and diisocyanates, and then uses a high molecular polymer to improve the mechanical strength of the prepared TPU plastic track material while avoiding affecting the rebound performance, and the cost is low, so that the obtained TPU plastic track material not only optimizes the performance, but also achieves the purpose of effectively controlling the cost; at the same time, the viscous liquid formed by chitosan is combined with chloroacetic acid and ether to fully activate the bamboo fiber powder, so that the modified bamboo fiber powder obtained by the activation treatment can achieve a synergistic reaction with polyether polyols and diisocyanates, thereby improving the mechanical strength of the prepared TPU plastic track material while optimizing the rebound elastic performance. The application of the TPU plastic runway material is that the TPU plastic runway material prepared by the preparation method of the TPU plastic runway material has the advantages of significantly improving the compatibility between the modified bamboo fiber powder and the polyether polyol, diisocyanate and high molecular polymer through surface activation, effectively improving the material mechanical strength of the TPU plastic runway material, and providing sufficient resilience when used in runways, ramps and non-motorized vehicle lanes. At the same time, by significantly improving the balance between resilience and strength when used in runways, ramps and non-motorized vehicle lanes, while improving the shock absorption effect, the wear resistance and impact resistance are achieved, and when used in runways, ramps and non-motorized vehicle lanes, the maintenance difficulty and maintenance cost are significantly reduced, and the anti-slip performance and anti-aging performance are improved, thereby effectively extending the service life.

[0058] The "first", "second", "third", "fourth", etc. (if any) referred to in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods or devices.

[0059] It should be noted that the descriptions involving "first", "second", etc. in this application are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0060] Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for preparing a TPU plastic track material, characterized in that: The steps include: Step 1, preparation of modified bamboo fiber powder: fresh bamboo is cut into strips or sheets, and then sequentially soaked in an alkaline solution, cooked at high temperature, filtered, washed and ground to obtain bamboo fiber powder; the bamboo fiber powder is then dispersed in an activation solvent, and modified bamboo fiber powder is obtained after activation treatment; Step 2, combination formula: prepare raw materials according to weight parts of 28-36 parts of polyether polyol, 20-22 parts of diisocyanate, 3-5 parts of modified bamboo fiber powder and 1-3 parts of high molecular polymer; Step 3, mixing components: mixing the raw materials, preheating, and obtaining a preheated mixed material; Step 4: Extrusion granulation: The preheated mixed material is introduced into a screw extruder, and TPU plastic track material particles are obtained through melting, foaming, extrusion and granulation.

2. The method for preparing a TPU plastic track material according to claim 1, characterized in that: The activation solvent comprises 5-12 parts of chitosan, 3-5 parts of chloroacetic acid, 12-20 parts of ether and 50-70 parts of deionized water by weight; the chitosan is a modified composite chitosan modified by a silane coupling agent.

3. The method for preparing a TPU plastic track material according to claim 2, characterized in that: The preparation method of the modified composite chitosan comprises the steps of ① mixing graphene and nano zinc oxide at a mass ratio of 1:2-4, adding 2wt% of KH-570 at a mass percentage to obtain a composite modified body; ② mixing the composite modified body with a chitosan solution at a mass ratio of 2-3:1 to obtain a viscous precursor; and ③ drying the viscous precursor at a low temperature to obtain.

4. The method for preparing a TPU plastic track material according to claim 1, characterized in that: The polyether polyol includes a polyether polyol with a molecular weight of 3000 and a polyether polyol with a molecular weight of 600 in a mass percentage of 2:1-2; and the polyether polyol is purchased from Guangzhou Yinghong Chemical Co., Ltd.

5. The method for preparing a TPU plastic track material according to claim 1, characterized in that: The diisocyanate is xylene diisocyanate, and is purchased from Shandong Xuchen Chemical Technology Co., Ltd.

6. The method for preparing a TPU plastic track material according to claim 1, characterized in that: In step 1, the alkaline solution is immersed in a calcium hydroxide, magnesium hydroxide or sodium hydroxide aqueous solution with a temperature controlled at 42-45° C., and the pH of the alkaline solution is controlled at 9-11.

7. The method for preparing a TPU plastic track material according to claim 1, characterized in that: In step 1, the high temperature cooking is to control the temperature to 80-90°C, cook for 2-5 hours, put into the cooking liquid for 1 hour after steaming for 1 hour, and replace the cooking liquid before putting into the cooking liquid, the cooking liquid is an alkaline solution with a pH greater than 7 and less than 10, and the alkaline solution is prepared by sodium bicarbonate and / or sodium hydroxide and water.

8. The method for preparing a TPU plastic track material according to claim 1, characterized in that: The high molecular polymer is selected from one or more of polypropylene, polyethylene, polystyrene, polyvinyl chloride and polyphenylene ether.

9. Application of the TPU plastic track material prepared by the method for preparing the TPU plastic track material as described in any one of claims 1 to 8 in a track, a ramp and a non-motorized vehicle lane.

10. The application of a TPU plastic track material according to claim 9, characterized in that: The preparation method of the runway, ramp or non-motor vehicle lane comprises the following steps: mixing 50-80 parts by weight of TPU plastic runway material, 25-70 parts of filler and 3-6 parts of antioxidant, and then introducing the mixture into a screw extruder to extrude the mixture into a coil and lay the coil on a road; the filler is calcium carbonate, talcum powder, clay, mica powder, titanium dioxide, indium tin oxide, antimony tin oxide or aluminum zinc oxide; the antioxidant is 3-tert-butyl-4-hydroxyanisole, 2-tert-butyl-4-hydroxyanisole, 2,6-di-tert-butyl-4-methylphenol, Fischer-Tropsch synthesis liquid wax, aromatic diamine, hindered phenol or octylbutyl diphenylamine; the temperature of the screw extruder is 220-250° C.; and the thickness of the coil is greater than or equal to 13 mm.

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