Polyurethane elastomer suitable for doffing wheel and preparation method of polyurethane elastomer

Abstract

The invention belongs to the field of new materials, and provides a polyurethane elastomer suitable for a doffer wheel and a preparation method thereof.The polyurethane elastomer is prepared from, by weight, 100 parts of long-chain dihydric alcohol, 14-36 parts of diisocyanate, 3-24 parts of an alcohol chain extender, 3-9 parts of a fluorosilicone additive, 1-2 parts of an antistatic agent, 1-2 parts of an antioxidant and 0.5-1 part of an anti-hydrolysis agent. A doffer wheel product can be prepared by injection molding of polyurethane elastomer particles prepared by adopting a prepolymer pouring process or reaction. According to the technical scheme, the doffing wheel prepared from the polyurethane elastomer has the properties of high strength, low abrasion, high heat resistance, low heat generation, static electricity resistance and the like, the conventional performance requirements of the doffing wheel required by outdoor cotton picking operation can be met, the use safety can be improved, the doffing wheel is better matched with high-speed and high-frequency use scenes, and the doffing wheel is worthy of popularization and application. The replacement frequency of the cotton doffing disc is obviously reduced, manpower and material resources are saved, and the cotton picking efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of new materials, specifically relating to a polyurethane elastomer suitable for cotton removal wheels and its preparation method. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] During the cotton harvesting process, the cotton harvester needs to use the cotton removal wheel assembly to remove the cotton wrapped around the picking spindle assembly. However, during operation, the cotton removal wheel will be subjected to different degrees of wear when removing the cotton from the picking spindle because the amount of cotton wrapped around the picking spindles varies.

[0004] Current research on cotton removal wheels typically focuses on their component structure design. Only patent CN119409932A discloses a polyurethane for cotton removal discs and its preparation method. This method uses MDI and PTMG or PCL as the main raw materials to prepare polyurethane, adding antioxidants, wear-resistant agents, and amine chain extenders, such as polyaspartic acid ester. By controlling the reaction rate and crosslinking density, the material's cohesion and weather resistance are improved. It primarily improves polyurethane wear through wear-resistant agents, but these agents can migrate and release powder during use. Wear becomes unstable after the surface lubricating film wears away or the wear-resistant agent migrates and is lost. Furthermore, the use of an MDI system results in significant heat generation under high-speed friction conditions, leading to generalized heat resistance and delamination deformation during high-speed use, further reducing wear resistance. Moreover, the use of a mixture of alcohol and secondary amine chain extenders presents challenges in controlling the reaction, resulting in poor synergy. In particular, the steric hindrance of secondary amine chain extenders affects the material's molding, hardness, and dynamic properties. In addition, many other product issues arise during cotton picking machine operation, such as the fire hazard caused by heat or static electricity generated by the cotton removal wheel during the cotton picking process, the difficulty of cleaning the cotton removal wheel, and the performance in terms of wear and tear resistance when impurities such as cotton stalks and cotton husks are present.

[0005] Therefore, it is necessary to develop a polyurethane elastomer that can meet the requirements of high-intensity, high-frequency friction environment such as cotton picking. It should not only have excellent wear resistance, but also low heat generation during high-speed use, as well as antistatic and easy-to-clean properties, and be especially suitable for manufacturing cotton removal wheels.

[0006] However, due to the wide variety of isocyanates, chain extenders, and polyols, the polyurethane systems formed have different properties, and the compounding effects of different types of polyurethanes with additives also vary greatly. Therefore, the industry has not yet developed a polyurethane elastomer that combines high wear resistance, tear resistance, high strength, low internal heat generation, and antistatic properties to meet the requirements of cotton removal wheels. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a polyurethane elastomer material applicable to cotton removal wheels and its preparation method. This invention uses aromatic diisocyanate / alicyclic diisocyanate and diols with a molecular weight of 50 to 500 g / mol to form hard segments, and long-chain diols as soft segments. Further, fluorosilicone additives, antistatic agents, and other auxiliaries are introduced, effectively achieving a balance of wear resistance, tear resistance, strength, low internal heat generation, and antistatic properties. This results in a polyurethane elastomer possessing high wear resistance, tear resistance, high strength, low internal heat generation, and antistatic properties. The cotton removal wheel manufactured from this elastomer can meet the requirements for long-term use in high-intensity, high-frequency friction environments.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a polyurethane elastomer material applicable to cotton removal wheels, comprising the following raw materials in parts by weight: 100 parts of long-chain diol, 14-36 parts of diisocyanate, 3-24 parts of alcohol chain extender, 3-9 parts of fluorosilicone additive, 1-2 parts of antistatic agent, 1-2 parts of antioxidant, and 0.5-1 parts of antihydrolysis agent. The diisocyanate is selected from at least one of 1,4-phenylene diisocyanate, 1,5-naphthalene diisocyanate, isophthalimide diisocyanate, and 1,4-cyclohexane diisocyanate.

[0009] A second aspect of the present invention provides a method for preparing the above-mentioned polyurethane elastomer material applicable to cotton removal wheels, comprising: Prepared using any of the following methods: Method I involves reacting at least one long-chain diol with a diisocyanate to obtain a prepolymer with isocyanate-terminated ends. The prepolymer is then mixed uniformly with fluorosilicone additives, antistatic agents, antioxidants, and antihydrolysis agents as component 1, and at least one alcohol chain extender as component 2. The two components are mixed and cast to directly prepare molded products. Method II involves reacting at least one long-chain diol with a diisocyanate to obtain a prepolymer with isocyanate-terminated ends. The prepolymer is then mixed uniformly with fluorosilicone additives, antistatic agents, antioxidants, and anti-hydrolysis agents as component 1, and at least one alcohol chain extender as component 2. The two components are mixed and poured into a synthetic board, and after high-temperature curing, cooled and crushed to obtain a polyurethane elastomer crushed material that can be injection molded into products. Method III involves uniformly mixing at least one long-chain diol with fluorosilicone additives, antistatic agents, antioxidants, and anti-hydrolysis agents, and placing the mixture in the first feed tank of a twin-screw extruder gating system. Diisocyanate is melted and placed in the second feed tank of the twin-screw extruder gating system. The components are metered, transported, and mixed before being injected into the extruder. After partial reaction, an alcohol chain extender is added to the downstream fifth region. The reactants are then reacted and extruded in the twin-screw extruder. After synthesis, the resulting polymer melt is granulated underwater, and the resulting granules are dried. The resulting product can then be injection molded.

[0010] A third aspect of the present invention provides the application of the above-mentioned polyurethane elastomer material in the preparation of cotton removal wheels, wherein the cotton removal wheel products are processed by casting or injection molding.

[0011] Beneficial effects of the present invention (1) This invention prepares a polyurethane elastomer with high wear resistance, tear resistance, high strength, low internal heat generation, and antistatic properties through formulation design. The above properties can be achieved without a complex chain extension system. The use of fluorosilicone additives can not only reduce friction and wear resistance, but also improve the heat resistance, solvent resistance, easy cleaning, and non-migration and precipitation of the material. It has better performance than adding E wax and other wear-resistant agents. The use of antistatic agents can reduce surface resistance and avoid the accumulation of static charge during high-speed friction. It can not only meet the conventional performance requirements of cotton stripping wheels for outdoor cotton picking operations, but also improve the safety of use. It is more suitable for high-speed and high-frequency use scenarios, significantly reduces the number of times the cotton stripping disc is replaced, saves manpower and material resources, and improves cotton picking efficiency.

[0012] (2) The polyurethane elastomer material prepared based on the present invention can be used to prepare cotton removal wheels by casting or injection molding to meet the needs of different processing technologies.

[0013] (3) The preparation method of the present invention is simple, practical and easy to promote. Attached Figure Description

[0014] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. Exemplary embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0015] Figure 1 The dynamic mechanical properties of the product in Example 1 are measured using DMA tests, specifically the E' and tanδ curves.

[0016] Figure 2 The Fourier transform infrared spectrum of the product in Example 1 is shown.

[0017] Figure 3 The dynamic mechanical properties of the product of Comparative Example 2 were tested using DMA, and the E' and tanδ curves were obtained. Detailed Implementation

[0018] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art. The reagents and raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they are used in accordance with conventional methods in the art or product instructions. Similarly, unless otherwise specified, the test methods of this invention are performed in accordance with conventional methods in the art or industry-standard methods or practices. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of this invention. The preferred embodiments and materials described herein are for illustrative purposes only.

[0020] This invention provides a polyurethane elastomer material applicable to cotton removal wheels, which is composed of the following raw materials in parts by weight: 100 parts of long-chain diol, 14-36 parts of diisocyanate, 3-24 parts of alcohol chain extender, 3-9 parts of fluorosilicone additive, 1-2 parts of antistatic agent, 1-2 parts of antioxidant, and 0.5-1 parts of anti-hydrolysis agent. The type of diisocyanate affects the performance of polyurethane and its effect when compounded with additives. Therefore, this invention studies the types of diisocyanates. Preferably, the diisocyanate is selected from at least one of 1,4-phenylene diisocyanate, 1,5-naphthalene diisocyanate, isophthalimide diisocyanate, and 1,4-cyclohexane diisocyanate to obtain better performance.

[0021] Long-chain structures give polyurethane better flexibility and hydrolysis resistance, but reduce its strength. Therefore, this invention studies the molecular weight of long-chain diols. Preferably, the long-chain diols have a molecular weight of 1000 to 2000 g / mol to better balance the performance of various aspects.

[0022] The type of long-chain diol affects the performance of polyurethane and its effect when compounded with additives. Therefore, this invention studies the types of long-chain diols. Preferably, the long-chain diol is selected from at least one of polyadipate-based polyester diol, polycaprolactone diol, polycarbonate diol, and polyether diol to better improve the performance of polyurethane elastomer materials.

[0023] Increasing the molecular weight of chain extenders reduces the proportion of hard segments, resulting in decreased strength but increased elasticity. Therefore, this invention studies the molecular weight of alcohol chain extenders. Preferably, the alcohol chain extender is a diol with a molecular weight of 50 to 500 g / mol, so that the material has both superior strength and elasticity.

[0024] The type of alcohol chain extender affects the performance of polyurethane and its effect when compounded with additives. Therefore, this invention studies the types of alcohol chain extenders. Preferably, the alcohol chain extender is selected from at least one of 1,4-butanediol, hydroquinone dihydroxyethyl ether, and resorcinol dihydroxyethyl ether to obtain better elastomer properties.

[0025] The type of fluorosilicone additive affects its modification effect on polyurethane. Therefore, this invention studies the types of fluorosilicone additives. Preferably, the fluorosilicone additive is a mixture of organosilicon microspheres and polytetrafluoroethylene microspheres with a particle size of 1-3 micrometers, in order to better improve surface properties, enhance durability, and regulate processing technology.

[0026] To achieve better modification effects, this invention studied the mass ratio of organosilicon microspheres to polytetrafluoroethylene microspheres. Preferably, the mass ratio of organosilicon microspheres to polytetrafluoroethylene microspheres is 1:0.2~0.5, so as to better improve the surface properties of polyurethane elastomer, enhance durability, and adjust the processing technology.

[0027] The type of antistatic agent affects its modification effect on polyurethane. Therefore, this invention studies the types of antistatic agents. Preferably, the antistatic agent is selected from at least one of ionic antistatic agents, quaternary ammonium salt antistatic agents, quaternary phosphate salt antistatic agents, phosphate antistatic agents, and alkyl sulfonate antistatic agents to obtain better antistatic effects.

[0028] The type of antioxidant affects its modification effect on polyurethane. Therefore, this invention studies the type of antioxidant. Preferably, the antioxidant is selected from at least one of hindered phenolic antioxidants and phosphite antioxidants to obtain a better antioxidant effect.

[0029] The type of anti-hydrolysis agent affects its modification effect on polyurethane. Therefore, this invention studies the type of anti-hydrolysis agent. Preferably, the anti-hydrolysis agent is at least one of monomeric and polymeric carbodiimide anti-hydrolysis agents to better improve the hydrolysis resistance of polyurethane.

[0030] The present invention also provides a method for preparing the above-mentioned polyurethane elastomer material applicable to cotton removal wheels, comprising: Prepared using any of the following methods: Method I involves reacting at least one long-chain diol with a diisocyanate to obtain a prepolymer with isocyanate-terminated ends. The prepolymer is then mixed uniformly with fluorosilicone additives, antistatic agents, antioxidants, and antihydrolysis agents as component 1, and at least one alcohol chain extender as component 2. The two components are mixed and cast to directly prepare molded products. Method II involves reacting at least one long-chain diol with a diisocyanate to obtain a prepolymer with isocyanate-terminated ends. The prepolymer is then mixed uniformly with fluorosilicone additives, antistatic agents, antioxidants, and anti-hydrolysis agents as component 1, and at least one alcohol chain extender as component 2. The two components are mixed and poured into a synthetic board, and after high-temperature curing, cooled and crushed to obtain a polyurethane elastomer crushed material that can be injection molded into products. Method III involves uniformly mixing at least one long-chain diol with fluorosilicone additives, antistatic agents, antioxidants, and anti-hydrolysis agents, and placing the mixture in the first feed tank of a twin-screw extruder gating system. Diisocyanate is melted and placed in the second feed tank of the twin-screw extruder gating system. The components are metered, transported, and mixed before being injected into the extruder. After partial reaction, an alcohol chain extender is added to the downstream fifth region. The reactants are then reacted and extruded in the twin-screw extruder. After synthesis, the resulting polymer melt is granulated underwater, and the resulting granules are dried. The resulting product can then be injection molded.

[0031] Preferably, the molar ratio of the diisocyanate to the long-chain diol is 1.8-2.2; Preferably, the total amount of hydroxyl groups in the long-chain diol and alcohol chain extender is in a molar ratio of 0.9 to 0.98 to the isocyanate groups in the diisocyanate.

[0032] The present invention will be further described in detail below with reference to specific embodiments. It should be noted that the specific embodiments are explanations of the present invention and not limitations thereof.

[0033] In the following examples, the polycarbonate polyol with a molecular weight of 2000 is SYH2000 (purchased from Shanghai Shuyu Chemical Co., Ltd.), and the polycarbonate polyol with a molecular weight of 1000 is SYH1000 (purchased from Shanghai Shuyu Chemical Co., Ltd.).

[0034] The silicone microspheres were TP908UV, purchased from Yongqi Materials Technology (Shanghai) Co., Ltd.

[0035] Example 1 100 kg of polycarbonate polyol with a molecular weight of 2000 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 100 Pa for 4 hours to dehydrate it. The moisture content was measured to be 190 ppm. The mixture was then cooled to 70°C, and 16.4 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed to disperse the PPDI completely in the polyol within 30 minutes. The reactor temperature was maintained at 80°C for 3 hours, followed by vacuum degassing for 30 minutes. The mixture was then cooled to 70°C, and the NCO content was measured to be 3.75%. 4.6 kg of organosilicon microspheres, 2.3 kg of polytetrafluoroethylene microspheres, 1.5 kg of antistatic agent CUCE-W, 2.0 kg of antioxidant 1010, and anti-hydrolysis agent 1010 were then added to the reactor. 0.5 kg was stirred at high speed for 10 min to disperse evenly, resulting in component 1. An appropriate amount of component 1 was added to tank A of the casting machine, and chain extender component 1,4-butanediol was added as component 2 to tank C of the casting machine. The temperatures were set to 80℃ and 60℃ respectively. After high-speed mixing of component 1 and component 2 at a ratio of 100g:3.48g, the mixture was injected into the test piece mold and the cotton removal wheel mold. The mold temperature was 120℃, and the mold was demolded after 60 min. The test piece and cotton removal wheel sample were immediately placed in a 120℃ oven for vulcanization for 24 h, and then cooled at room temperature for 1 week before performance evaluation.

[0036] Example 2 Component 1 of Example 1 was placed in a vacuum reactor for vacuum degassing for 60 seconds, and 1,4-butanediol, as component 2, was placed in another vacuum reactor for vacuum degassing for 30 seconds. Then, the two components were fed to a mixing head at a metered ratio of 100g:3.48g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 20 minutes to allow for complete solidification. The solidified material was then transferred to an industrial oven at 120°C for 24 hours of vulcanization. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer. The crushed material was then used in an injection molding machine to process test pieces and de-coating wheel samples. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0037] Example 3 100 kg of polycarbonate polyol with a molecular weight of 2000 g / mol was mixed uniformly with fluorosilicone additives, antistatic agents, antioxidants, and anti-hydrolysis agents. The mixture contained 4.6 kg of organosilicon microspheres, 2.3 kg of polytetrafluoroethylene microspheres, 1.5 kg of antistatic agent CUCE-W, 2.0 kg of antioxidant 1010, and 0.5 kg of anti-hydrolysis agent 1010. This mixture was placed in the first feed tank of a twin-screw extruder's gating system. Terephthalic diisocyanate was melted at 100°C under a nitrogen atmosphere and placed in the second feed tank of the twin-screw extruder's gating system. The components were metered, mixed, and injected into the extruder. The metering ratio of the first feed tank, the second feed tank, and the chain extender (1,4-butanediol) was 100 g: 14.79 g: 3.48 g. The extruder front zone temperature was set to 140-180°C. After partial reaction, the 1,4-butanediol chain extender was added... In the fifth zone of the process, the extruder temperature is set at 180-220℃. The reactive components are reacted and extruded in a twin-screw extruder. After synthesis, the resulting polymer melt is cooled in a cooling zone and transported by a melt pump for underwater granulation. The resulting granules are then dried at 100℃ for 24 hours in a dehumidifying silo to obtain polyurethane elastomer granules. These granules are then used in an injection molding machine to process test pieces and desiccant wheel samples. The injection molding temperature is controlled within the range of 210-240℃, and the injection pressure is controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0038] Example 4 100 kg of polycaprolactone polyol with a molecular weight of 2000 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 100 Pa for 4 hours to dehydrate it. The moisture content was measured to be 150 ppm. The mixture was then cooled to 70°C, and 16.81 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed to disperse the PPDI completely in the polyol within 30 minutes. The reactor temperature was maintained at 80°C for 3 hours, followed by vacuum degassing for 30 minutes. The temperature was then lowered to 70°C, and the NCO content was measured to be 3.95%. 6.0 kg of organosilicon microspheres, 2.0 kg of polytetrafluoroethylene microspheres, 2.0 kg of antistatic agent LQ01, 2.0 kg of antioxidant 1010, and anti-hydrolysis agent 1010 were then added to the reactor. 0.8 kg of hydroquinone dihydroxyethyl ether was dispersed evenly by high-speed stirring for 10 min to obtain component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 s. Hydroquinone dihydroxyethyl ether, as component 2, was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then fed to a mixing head at a metered ratio of 100 g: 7.78 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 25 min to fully solidify. The solidified material was then transferred to an industrial oven at 120°C for vulcanization for 24 h. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer. The crushed material was then used in an injection molding machine to process test pieces and de-cotton wheel samples. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0039] Example 5 100 kg of polycaprolactone polyol with a molecular weight of 1250 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 100 Pa for 4 hours to dehydrate it. The moisture content was measured to be 150 ppm. The temperature was then lowered to 70°C, and 25.62 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed to disperse the PPDI completely in the polyol within 30 minutes. The reactor temperature was maintained at 80°C for 2.5 hours, followed by vacuum degassing for 30 minutes. The temperature was then lowered to 70°C, and the NCO content was measured to be 5.34%. 7.0 kg of organosilicon microspheres, 1.5 kg of polytetrafluoroethylene microspheres, 2.0 kg of antistatic agent CUCE-W, 2.0 kg of antioxidant 1076, and 220 anti-hydrolysis agent were then added to the reactor. 0.8 kg of polyurethane elastomer was mixed at high speed for 10 min to obtain component 1, which was then transferred to a vacuum reactor for vacuum degassing for 60 s. 1,4-Butanediol, as component 2, was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then transferred to a mixing head at a metered ratio of 100 g: 4.89 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 25 min to fully solidify. The solidified material was then transferred to an industrial oven at 120°C for 24 h of vulcanization. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer. The crushed material was then used in an injection molding machine to process test pieces and de-coating wheel samples. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0040] Example 6 100 kg of polytetrahydrofuran ether polyol with a molecular weight of 1800 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 80 Pa for 4 hours to dehydrate it. The moisture content was measured to be 190 ppm. The temperature was then lowered to 70°C, and 18.68 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed to disperse the PPDI completely in the polyol within 20 minutes. The reactor temperature was maintained at 80°C for 3.0 hours, followed by vacuum degassing for 30 minutes. The temperature was then lowered to 70°C, and the NCO content was measured to be 4.32%. 4.0 kg of organosilicon microspheres, 2.0 kg of polytetrafluoroethylene microspheres, 2.0 kg of antistatic agent CUCE-ASW, 1.5 kg of antioxidant 1076, 1.0 kg of antioxidant 168, and anti-hydrolysis agent 1010 were then added to the reactor. 0.5 kg was stirred at high speed for 10 min to disperse evenly, resulting in component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 s. A mixture of hydroquinone dihydroxyethyl ether and resorcinol dihydroxyethyl ether in a mass ratio of 8:2 was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then transferred to a mixing head at a metered ratio of 100 g: 8.87 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 150°C for 20 min to fully solidify. The solidified material was then transferred to an industrial oven at 115°C for 24 h of vulcanization. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer material. The crushed material was then used to process test pieces and de-cotton wheel samples using an injection molding machine. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0041] Example 7 100 kg of polytetrahydrofuran ether polyol with a molecular weight of 1000 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 80 Pa for 4 hours to dehydrate it. The moisture content was measured to be 190 ppm. The temperature was then lowered to 70°C, and 32.02 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed to disperse the PPDI completely in the polyol within 20 minutes. The reactor temperature was maintained at 80°C for 3.0 hours, followed by vacuum degassing for 30 minutes. The temperature was then lowered to 70°C, and the NCO content was measured to be 6.35%. 5.0 kg of organosilicon microspheres, 2.5 kg of polytetrafluoroethylene microspheres, 2.0 kg of antistatic agent CUCE-ASW, 1.5 kg of antioxidant 1076, 1.5 kg of antioxidant 168, and anti-hydrolysis agent 1010 were then added to the reactor. 0.8 kg of polyurethane elastomer was mixed at high speed for 10 min to obtain component 1, which was then transferred to a vacuum reactor for vacuum degassing for 60 s. 1,4-Butanediol, as component 2, was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then transferred to a mixing head at a metered ratio of 100 g: 5.78 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 150°C for 20 min to fully solidify. The solidified material was then transferred to an industrial oven at 115°C for 24 h of vulcanization. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer. The crushed material was then used in an injection molding machine to process test pieces and de-coating wheel samples. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0042] Example 8 100 kg of polybutylene adipate polyol with a molecular weight of 1300 g / mol was added to a reaction vessel. The mixture was heated to 110°C and vacuumed to below 80 Pa for 4 hours to dehydrate it. The moisture content was measured to be 150 ppm. The mixture was then cooled to 70°C, and 25.25 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed to disperse the PPDI completely in the polyol within 20 minutes. The reaction was maintained at 80°C for 3.0 hours, followed by vacuum degassing for 30 minutes. The mixture was then cooled to 70°C, and the NCO content was measured to be 5.40%. 6.0 kg of organosilicon microspheres, 2.0 kg of polytetrafluoroethylene microspheres, 2.0 kg of antistatic agent CUCE-W, 1.5 kg of antioxidant 1010, 1.5 kg of antioxidant 168, and anti-hydrolysis agent 1010 were then added to the reaction vessel. 0.8 kg of polyurethane elastomer was mixed at high speed for 10 minutes to disperse it evenly, resulting in component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 seconds. 1,4-Butanediol, as component 2, was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 seconds. The two components were then transferred to a mixing head at a metered ratio of 100 g: 4.83 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 20 minutes to allow for full solidification. The solidified material was then transferred to an industrial oven at 120°C for 24 hours of vulcanization. The material was then removed, cooled, and crushed to obtain polyurethane elastomer crushed material. The crushed material was then used to process test pieces and de-cotton wheel samples using an injection molding machine. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0043] Example 9 100 kg of polybutylene adipate polyol with a molecular weight of 1950 g / mol was added to a reaction vessel. The mixture was heated to 110°C and vacuumed to below 80 Pa for 4 hours for dehydration. The moisture content was measured to be 140 ppm. The mixture was then cooled to 70°C, and 16.83 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed and dispersed completely in the polyol within 25 minutes. The reaction vessel temperature was maintained at 80°C for 3.0 hours, followed by vacuum degassing for 30 minutes. The mixture was then cooled to 70°C, and the NCO content was measured to be 3.85%. 5.0 kg of organosilicon microspheres, 2.5 kg of polytetrafluoroethylene microspheres, 2.0 kg of antistatic agent CUCE-W, 1.5 kg of antioxidant 1010, 0.5 kg of antioxidant 1076, and anti-hydrolysis agent 1010 were then added to the reaction vessel. 0.7 kg was stirred at high speed for 10 min to disperse evenly, resulting in component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 s. A mixture of 1,4-butanediol and hydroquinone dihydroxyethyl ether (2 / 8 mass ratio) was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then transferred to a mixing head at a metered ratio of 100 g: 6.26 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 20 min to fully solidify. The solidified material was then transferred to an industrial oven at 120°C for 24 h of vulcanization. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer. The crushed material was then used to process test pieces and de-cotton wheel samples using an injection molding machine. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0044] Example 10 80 kg of polycarbonate polyol with a molecular weight of 2000 g / mol and 20 kg of polycarbonate polyol with a molecular weight of 1000 g / mol were added to a reaction vessel and mixed evenly. The mixture was heated to 110°C and vacuumed to below 80 Pa for 4 hours for dehydration. The moisture content was measured to be 140 ppm. The mixture was then cooled to 70°C, and 20.18 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed and dispersed completely in the polyol within 25 minutes. The reaction was maintained at 80°C for 3.0 hours, followed by vacuum degassing for 30 minutes. The mixture was then cooled to 70°C, and the NCO content was measured to be 4.60%. 6.0 kg of organosilicon microspheres, 2.0 kg of polytetrafluoroethylene microspheres, 2.0 kg of antistatic agent CUCE-W, 1.0 kg of antioxidant 1010, and 1076 were added to the reaction vessel. 1.0 kg of hydrolysate inhibitor and 10100.8 kg of anti-hydrolysis agent were mixed at high speed for 10 min to disperse evenly, resulting in component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 s. A mixture of hydroquinone dihydroxyethyl ether and resorcinol dihydroxyethyl ether at a mass ratio of 7 / 3 was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then transferred to a mixing head at a metered ratio of 100 g: 9.21 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 20 min to fully solidify. The solidified material was then transferred to an industrial oven at 120°C for vulcanization for 24 h. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer material. The crushed material was then used to process test pieces and de-cotton wheel samples using an injection molding machine. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0045] Comparative Example 1, MDI+BDO system This comparative example modifies the PPDI system of Example 4 to an MDI system and omits some additives. Furthermore, to ensure the product has a similar hardness range to Example 4, the NCO content and the amount of chain extender were adjusted accordingly, specifically including: 100 kg of polycaprolactone polyol with a molecular weight of 2000 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 100 Pa for 4 hours to remove moisture. A sample was taken and the moisture content was found to be 160 ppm. The mixture was then cooled to 70°C, and 56.30 kg of diphenylmethane diisocyanate (MDI) was added. The mixture was stirred at high speed to disperse the molecules, and the reactor temperature was maintained at 80°C for 3 hours. Vacuum degassing was performed for 30 minutes, and the mixture was cooled to 70°C. A sample was taken and the NCO content was found to be 9.35%. Antioxidant 1010 was then added to the reactor. 2.0 kg of anti-hydrolysis agent and 10100.8 kg of 10100 were mixed at high speed for 10 min to obtain component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 s. 1,4-Butanediol, as component 2, was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then transferred to a mixing head at a metered ratio of 100 g: 9.38 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 25 min to fully solidify. The solidified material was then transferred to an industrial oven at 120°C for 24 h of vulcanization. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer. The crushed material was then used to process test pieces and de-cotton wheel samples using an injection molding machine. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0046] As can be seen from the comparison between Comparative Example 1 and Example 4, compared with the MDI+BDO system, the addition of PPDI+BDO system and fluorosilicone additives and antistatic agents significantly enhances the tensile strength, tear strength and wear resistance of the material, and has a higher Vicat softening point and an extremely low loss tangent.

[0047] Comparative Example 2, MDI+HQEE System This comparative example, based on Comparative Example 1 (MDI+BDO system), uses HQEE instead of BDO to improve heat resistance. Simultaneously, to ensure the product has a similar hardness range to Example 4, the NCO content and the amount of chain extender were adjusted accordingly, specifically including: 100 kg of polycaprolactone polyol with a molecular weight of 2000 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 100 Pa for 4 hours to remove moisture. A sample was taken and the moisture content was found to be 160 ppm. The mixture was then cooled to 70°C, and 56.30 kg of diphenylmethane diisocyanate (MDI) was added. The mixture was stirred at high speed to disperse the molecules, and the reactor temperature was maintained at 80°C for 3 hours. Vacuum degassing was performed for 30 minutes, and the mixture was cooled to 70°C. A sample was taken and the NCO content was found to be 9.35%. Antioxidant 1010 was then added to the reactor. 2.0 kg of hydrolysis inhibitor and 10100.8 kg of anti-hydrolysis agent were mixed at high speed for 10 min to obtain component 1, which was then transferred to a vacuum reactor for vacuum degassing for 60 s. Hydroquinone dihydroxyethyl ether, as component 2, was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. Then, the two components were transferred to a mixing head at a metered ratio of 100 g: 20.64 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 25 min to fully solidify. The solidified material was then transferred to an industrial oven at 120°C for 24 h of vulcanization. The material was then removed, cooled, and crushed to obtain polyurethane elastomer crushed material. The crushed material was then used to process test pieces and de-cotton wheel samples using an injection molding machine. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0048] The comparison between Comparative Example 2 and Example 4 shows that, compared with the MDI+HQEE system, the addition of PPDI+BDO system and fluorosilicone additives and antistatic agents significantly enhances the tensile strength, tear strength and wear resistance of the material, significantly increases the Vicat softening point, and significantly reduces the loss tangent.

[0049] Comparative Example 3: The MDI+HQEE system with added fluorosilicone additives and antistatic agents was compared to examine the differences in tanδ. This comparative example is based on Comparative Example 2 (MDI+HQEE system), with the addition of fluorosilicone additives, antistatic agents, etc., specifically including: 100 kg of polycaprolactone polyol with a molecular weight of 2000 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 100 Pa for 4 hours to dehydrate it. The moisture content was measured to be 160 ppm. The mixture was then cooled to 70°C, and 56.30 kg of diphenylmethane diisocyanate (MDI) was added. The mixture was stirred at high speed to disperse the precipitate and the reactor temperature was maintained at 80°C for 3 hours. Vacuum degassing was performed for 30 minutes, and the mixture was cooled to 70°C. The NCO content was measured to be 9.35%. 6.0 kg of organosilicon microspheres, 2.0 kg of polytetrafluoroethylene microspheres, 2.0 kg of antistatic agent LQ01, 2.0 kg of antioxidant 1010, and anti-hydrolysis agent 1010 were then added to the reactor. 0.8 kg of hydroquinone dihydroxyethyl ether was dispersed evenly by high-speed stirring for 10 min to obtain component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 s. Hydroquinone dihydroxyethyl ether, as component 2, was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then fed to a mixing head at a metered ratio of 100 g: 19.42 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 25 min to fully solidify. The solidified material was then transferred to an industrial oven at 120°C for vulcanization for 24 h. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer. The crushed material was then used in an injection molding machine to process test pieces and de-cotton wheel samples. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0050] As can be seen from the comparison of Comparative Example 3 and Example 4, compared with the MDI+HQEE system, the PPDI+BDO system can better match with fluorosilicone additives and antistatic agents, and the tensile strength, tear strength and wear resistance of the material are significantly enhanced, the Vicat softening point is significantly increased, and the loss tangent is significantly reduced.

[0051] Comparative Example 4 uses the wear-resistant additive Licowax E powder described in patent CN119409932A to replace the fluorosilicone additive and does not add an antistatic agent. This comparative example, based on Example 4, replaces the wear-resistant additive by using Licowax Epowder instead of the fluorosilicone additive and omits the antistatic agent. Furthermore, to ensure the product has a similar hardness range to Example 4, the amount of the chain extender component was adjusted accordingly, specifically including: 100 kg of polycaprolactone polyol with a molecular weight of 2000 g / mol was added to a reaction vessel. The mixture was heated to 110°C and vacuumed to below 100 Pa for 4 hours to dehydrate it. The moisture content was measured to be 150 ppm. The mixture was then cooled to 70°C, and 16.81 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed to disperse the PPDI completely in the polyol within 30 minutes. The reaction vessel temperature was maintained at 80°C for 3 hours, followed by vacuum degassing for 30 minutes. The mixture was then cooled to 70°C, and the NCO content was measured to be 3.95%. 2.0 kg of Licowax E powder (a wear-resistant additive described in patent CN119409932A), 2.0 kg of antioxidant 1010, and 1010 anti-hydrolysis agent were added to the reaction vessel. 0.8 kg of hydroquinone dihydroxyethyl ether was dispersed evenly by high-speed stirring for 10 min to obtain component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 s. Hydroquinone dihydroxyethyl ether, as component 2, was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then fed to a mixing head at a metered ratio of 100 g: 9.39 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 25 min to fully solidify. The solidified material was then transferred to an industrial oven at 120°C for vulcanization for 24 h. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer. The crushed material was then used in an injection molding machine to process test pieces and de-cotton wheel samples. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0052] As can be seen from the comparison between Comparative Example 4 and Example 4, the introduction of fluorosilicone additives and antistatic agents can better improve the wear resistance of materials compared with the wear-resistant additive Licowax E powder.

[0053] Comparative Example 5: The PPDI system adopted the chain extension scheme of 1,4-butanediol and polyaspartic acid ester NH1520 from patent CN119409932A. The difference from Example 4 is that 1,4-butanediol and polyaspartic acid ester NH1520 were used instead of hydroquinone dihydroxyethyl ether for chain extension. Furthermore, to achieve a similar hardness range as in Example 4, the amounts of chain-extending components and the process were adjusted accordingly, specifically including: 100 kg of polycaprolactone polyol with a molecular weight of 2000 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 100 Pa for 4 hours to dehydrate it. The moisture content was measured to be 150 ppm. The mixture was then cooled to 70°C, and 16.81 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed to disperse the PPDI completely in the polyol within 30 minutes. The reactor temperature was maintained at 80°C for 3 hours, followed by vacuum degassing for 30 minutes. The temperature was then lowered to 70°C, and the NCO content was measured to be 3.95%. 6.0 kg of organosilicon microspheres, 2.0 kg of polytetrafluoroethylene microspheres, 2.0 kg of antistatic agent LQ01, 2.0 kg of antioxidant 1010, and anti-hydrolysis agent 1010 were then added to the reactor. 0.8 kg was stirred at high speed for 10 min to disperse evenly, resulting in component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 s. A mixture of 1,4-butanediol and polyaspartic acid ester NH1520 (mass ratio 85:15) was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then transferred to a mixing head at a metered ratio of 100 g: 4.16 g. After high-speed mixing, the mixture was poured into a synthesis board. After 25 min at 160°C, the material was not fully cured. After 45 min, the surface was no longer sticky. The material was then transferred to an industrial oven at 110°C for vulcanization for 24 h. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer. The crushed material was then used to process test pieces and de-coating wheel samples using an injection molding machine. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 110℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0054] As can be seen from the comparison between Comparative Example 5 and Example 4, compared with chain extenders of 1,4-butanediol and polyaspartic acid ester NH1520, using diols with a molecular weight of 50 to 500 g / mol as chain extenders can better match the PPDI system. The hardness, tensile strength, tear strength and wear resistance of the material are significantly enhanced, the Vicat softening point is significantly increased and the loss tangent is significantly reduced.

[0055] Comparative Example 6: The MDI system adopted the chain extension scheme of 1,4-butanediol and polyaspartic acid ester NH1520 from patent CN119409932A. Based on Comparative Example 5, the MDI system was chain-extended using 1,4-butanediol and polyaspartic acid ester NH1520. Meanwhile, to ensure the product had a similar hardness range to Example 4, adjustments were made to the NCO content, the amount of chain-extending components, and the process, specifically including: 100 kg of polycaprolactone polyol with a molecular weight of 2000 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 100 Pa for 4 hours to dehydrate it. The moisture content was measured to be 160 ppm. The mixture was then cooled to 70°C, and 56.30 kg of diphenylmethane diisocyanate (MDI) was added. The mixture was stirred at high speed to disperse the precipitate and the reactor temperature was maintained at 80°C for 3 hours. Vacuum degassing was performed for 30 minutes, and the mixture was cooled to 70°C. The NCO content was measured to be 9.35%. 6.0 kg of organosilicon microspheres, 2.0 kg of polytetrafluoroethylene microspheres, 2.0 kg of antistatic agent LQ01, 2.0 kg of antioxidant 1010, and anti-hydrolysis agent 1010 were then added to the reactor. 0.8 kg was stirred at high speed for 10 min to disperse evenly, resulting in component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 s. A mixture of 1,4-butanediol and polyaspartic acid ester NH1520 (mass ratio 85:15) was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then transferred to a mixing head at a metered ratio of 100 g: 10.11 g. After high-speed mixing, the mixture was poured into a synthesis board. After being placed in the synthesis board at 160°C for 25 min, the material remained sticky. The temperature of the synthesis board was then reduced to 140°C and the time was extended to 60 min. After the surface of the material solidified, it was transferred to an industrial oven at 110°C for vulcanization for 24 h. The material was then removed, cooled, and crushed to obtain polyurethane elastomer crushed material. The crushed material was then used to process test pieces and de-cotton wheel samples using an injection molding machine. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 110℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0056] As can be seen from the comparison between Comparative Example 6 and Example 4, compared with the system of patent CN119409932A, the PPDI system of the present invention can significantly enhance the hardness, tensile strength, tear strength and wear resistance of the material, significantly increase the Vicat softening point and significantly reduce the loss tangent.

[0057] Comparative Example 7: The PPDI system additives were added normally, but the designed component ratios were not within the scope of the claims. The final product had low hardness (close to patent CN119409932A), and slightly inferior strength and wear resistance. 100 kg of polycaprolactone polyol with a molecular weight of 2000 g / mol was added to a reactor. The mixture was heated to 110°C and vacuumed to below 100 Pa for 4 hours to dehydrate it. The moisture content was measured to be 150 ppm. The mixture was then cooled to 70°C, and 13.61 kg of terephthalic diisocyanate (PPDI) was added. The mixture was stirred at high speed to disperse the PPDI completely in the polyol within 30 minutes. The reactor temperature was maintained at 80°C for 3 hours, followed by vacuum degassing for 30 minutes. The mixture was then cooled to 70°C, and the NCO content was measured to be 2.55%. 1.0 kg of organosilicon microspheres, 1.0 kg of polytetrafluoroethylene microspheres, 1.0 kg of antistatic agent LQ01, 2.0 kg of antioxidant 1010, and 1010 anti-hydrolysis agent were then added to the reactor. 0.8 kg of hydroquinone dihydroxyethyl ether was dispersed evenly by high-speed stirring for 10 min to obtain component 1. This component was then transferred to a vacuum reactor for vacuum degassing for 60 s. Hydroquinone dihydroxyethyl ether, as component 2, was placed in another vacuum reactor for high-temperature melting and vacuum degassing for 30 s. The two components were then fed to a mixing head at a metered ratio of 100 g: 5.45 g. After high-speed mixing, the mixture was poured into a synthesis board and left to stand at 160°C for 25 min to fully solidify. The solidified material was then transferred to an industrial oven at 120°C for vulcanization for 24 h. The material was then removed, cooled, and crushed to obtain crushed polyurethane elastomer. The crushed material was then used in an injection molding machine to process test pieces and de-coating wheel samples. The injection temperature was controlled within the range of 210-240°C, and the injection pressure was controlled at 50 kgf / cm². 2 -70kgf / cm 2 Scope. The obtained test pieces and samples were annealed in an oven at 120℃ for 24 hours and then cooled to room temperature for 1 week before performance evaluation.

[0058] As can be seen from the comparison between Comparative Example 7 and Example 4, the strength and wear resistance of the material decreased after the proportion of raw materials was changed.

[0059] Table 1 shows the performance test results of the polyurethane products prepared in the above embodiments and comparative examples.

[0060] Table 1

[0061] As can be seen, the polyurethane elastomer prepared based on the technical solution of this invention not only possesses excellent tensile strength, tear resistance, and low system abrasion and friction coefficient, achieving wear resistance and friction reduction, but also has a high Vicat softening point and extremely low loss tangent (tanδ), achieving low heat generation in high-heat and high-speed application scenarios. Simultaneously, it has a lower surface resistivity than conventional polyurethane elastomers, providing antistatic functionality. The cotton-removing wheel prepared based on the polyurethane elastomer of this invention not only meets the conventional performance requirements of cotton-removing wheels for outdoor cotton harvesting operations, but also improves safety, is better suited for high-speed and high-frequency application scenarios, significantly reduces the frequency of cotton-removing disc replacement, saves manpower and resources, and improves cotton harvesting efficiency.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A polyurethane elastomer material applicable to a de-cottoning wheel, characterized in that, consists of the following raw materials by weight: long-chain diols 100 parts, diisocyanate 14-36 parts, alcohol chain extender 3-24 parts, fluorosilicon additive 3-9 parts, antistatic agent 1-2 parts, antioxidant 1-2 parts, anti-hydrolysis agent 0.5-1 part; The diisocyanate is selected from at least one of 1,4-p-phenylene diisocyanate, 1,5-naphthalene diisocyanate, m-xylylene diisocyanate, and 1,4-cyclohexane diisocyanate.

2. The polyurethane elastomer material applicable to the de-cimming wheel according to claim 1, characterized in that, The long-chain diols have a molecular weight of 1000 to 2000 g / mol; Alternatively, the long-chain diols are selected from at least one of polyester diol based on adipic acid, polycaprolactone diol, polycarbonate diol, and polyether diol.

3. The polyurethane elastomer material applicable to the de-cimming wheel according to claim 1, characterized in that, The alcohol chain extender is a diol having a molecular weight of 50 to 500 g / mol; Alternatively, the alcohol chain extender is selected from at least one of 1,4-butanediol, hydroxyethyl ether of p-benzenediol, and hydroxyethyl ether of m-benzenediol.

4. The polyurethane elastomer material applicable to a de-cimming wheel according to claim 1, wherein, The fluorosilicon additive is a mixture of silicone microspheres and polytetrafluoroethylene microspheres having a particle size of 1-3 microns; Alternatively, the mass ratio of the silicone microspheres to the polytetrafluoroethylene microspheres is 1:0.2-0.

5.

5. The polyurethane elastomer material applicable to the de-cimming wheel according to claim 1, wherein, The antistatic agent is selected from at least one of ionic antistatic agents, quaternary ammonium salt antistatic agents, quaternary phosphonium salt antistatic agents, phosphate antistatic agents, and alkyl sulfonate antistatic agents.

6. The polyurethane elastomer material applicable to a de-cimming wheel according to claim 1, wherein, The antioxidant is selected from at least one of hindered phenol antioxidants and phosphite antioxidants.

7. The polyurethane elastomer material applicable to a de-cimming wheel according to claim 1, wherein, The anti-hydrolysis agent is at least one of monomeric and polymeric carbodiimide anti-hydrolysis agents.

8. A process for the preparation of a polyurethane elastomer material applicable to a de-cimming wheel according to any one of claims 1-7, characterized in that, The method comprises the following steps: Preparation is performed by any one of the following methods: Method I: at least one long-chain diol and diisocyanate are reacted to obtain a prepolymer capped with isocyanate groups, and then the prepolymer is uniformly mixed with a fluorosilicon additive, an antistatic agent, an antioxidant, and an anti-hydrolysis agent to serve as component 1, at least one alcohol chain extender serves as component 2, and the two components are directly prepared into a molded product by mixed casting; Method II: at least one long-chain diol and diisocyanate are reacted to obtain a prepolymer capped with isocyanate groups, and then the prepolymer is uniformly mixed with a fluorosilicon additive, an antistatic agent, an antioxidant, and an anti-hydrolysis agent to serve as component 1, at least one alcohol chain extender serves as component 2, and the two components are mixed and cast in a synthesis plate, and after high-temperature curing, cooling and crushing, a polyurethane elastomer crushing material that can be processed by injection molding is obtained, and products can be processed by injection molding; Method III: at least one long-chain diol is uniformly mixed with a fluorosilicon additive, an antistatic agent, an antioxidant, and an anti-hydrolysis agent, and placed in a first tank of a double-screw extruder casting system, diisocyanate is melted and placed in a second tank of the double-screw extruder casting system, the components are metered, transported and mixed, and then injected into the extruder, after partial reaction, an alcohol chain extender is added to the fifth region downstream, and the reaction components are reacted and extruded in the double-screw extruder, and after synthesis, the obtained polymer melt is underwater pelletized and dried, and products can be processed by injection molding.

9. The method of claim 8, wherein the polyurethane elastomer material is prepared by applying the polyurethane elastomer material to the de-cimming wheel. The molar ratio of the diisocyanate to the long-chain diol is 1.8-2.

2. Or, the total amount of hydroxyl in the long-chain diols and alcohol chain extender and the mole ratio of isocyanate groups in the diisocyanate is 0.9-0.

98.

10. Use of the polyurethane elastomer material according to any one of claims 1 to 7 for the production of a de-linting wheel, characterized in that, The processing of the de-cottoning wheel product is carried out by pouring or injection molding.

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