Thermoplastic polyurethane resin and method for producing same
By using specific reactants and steps to form a resin with an appropriate melt index and molecular weight ratio in the manufacturing process of thermoplastic polyurethane resin, the problem of easy cracking of thermoplastic polyurethane resin at high temperatures is solved, and the effect of reducing flue gas generation and improving heat resistance is achieved.
Patent Information
- Application Number
- CN202410063827.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-27
- Filing Date
- 2024-01-16
- Publication Date
- 2025-06-27
AI Technical Summary
Existing thermoplastic polyurethane resins are prone to cracking during high-temperature processing, producing flue gas, endangering the environment and personnel health, and leading to a decline in physical properties.
By one manufacturing method, a prepolymer is formed using diphenylmethane diisocyanate, polyether polyol and a chain extender, and a chain terminator is added when a predetermined melt index is reached to form a thermoplastic polyurethane resin with an appropriate melt index and molecular weight ratio.
It effectively improves the problem of thermoplastic polyurethane resin being easy to crack at high temperatures, reduces the generation of flue gas, and improves the heat resistance and processing performance of the material.
Smart Images
Figure CN120209242A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a thermoplastic polyurethane resin and a manufacturing method thereof, and particularly to a low-smoke-emitting thermoplastic polyurethane resin and a manufacturing method thereof. Background Art
[0002] During the high-temperature processing of existing thermoplastic polyurethane resins, fumes are easily generated due to pyrolysis. The fumes generated by pyrolysis can harm the working environment and workers, and the physical properties of existing thermoplastic polyurethane resins also deteriorate due to pyrolysis. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a thermoplastic polyurethane resin and a manufacturing method thereof in view of the deficiencies of the prior art, which can effectively improve the problem that existing thermoplastic polyurethanes are prone to pyrolysis.
[0004] To solve the above technical problem, one of the technical solutions adopted by the present invention is to provide a manufacturing method of a thermoplastic polyurethane resin, which includes: a reaction step of reacting a diphenylmethane diisocyanate, a polyether polyol, and a chain extender to form a prepolymer; wherein, the polyether polyol is selected from at least one of the material group consisting of high-purity polytetramethylene glycol, polypropylene glycol, and polyethylene glycol, and the chain extender is selected from at least one of the material group consisting of 1,4-butanediol, 1,3-propanediol, diethylene glycol, and 2-methyl-1,3-propanediol; a measurement and termination step of measuring an instantaneous melt index of the prepolymer, and adding a chain terminator when the instantaneous melt index reaches a predetermined melt index to form a thermoplastic polyurethane resin having a melt index; wherein, the predetermined melt index is between 7 g / min and 10 g / min, and the melt index is between 2 g / min and 10 g / min; wherein, the weight-average molecular weight of the thermoplastic polyurethane resin is between 100,000 and 180,000.
[0005] Preferably, the dosage of the diphenylmethane diisocyanate is between 33 parts by weight and 36 parts by weight, the dosage of the polyether polyol is between 53 parts by weight and 57 parts by weight, the dosage of the chain extender is between 7 parts by weight and 9 parts by weight, and the dosage of the chain terminator is between 0.1 part by weight and 0.3 part by weight.
[0006] Preferably, the polyether polyol is the high-purity polytetramethylene glycol, the high-purity polytetramethylene glycol contains polytetramethylene glycol and impurities, the impurities include tetrahydrofuran and tetrahydrofuran oligomers, and the high-purity polytetramethylene glycol has a purity between 95% and 99.9%.
[0007] Preferably, the chain terminator is at least one selected from the group consisting of lauryl alcohol, palmityl alcohol, and stearyl alcohol.
[0008] Preferably, an antioxidant is further added in the reaction step. The antioxidant is at least one selected from the group consisting of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,6-di-tert-butyl-p-cresol, octyl (3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and N,N'-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexanediamine, and the dosage of the antioxidant is between 0.5 parts by weight and 1 part by weight.
[0009] Preferably, the thermoplastic polyurethane resin has a number average molecular weight between 85,000 and 90,000.
[0010] Preferably, the ratio of the weight average molecular weight to the number average molecular weight of the thermoplastic polyurethane resin is between 1.5 and 1.75.
[0011] To solve the above technical problems, another technical solution adopted by the present invention is to provide a thermoplastic polyurethane resin, which includes: diphenylmethane diisocyanate; a polyether polyol; wherein the polyether polyol is at least one selected from the group consisting of high-purity polyoxytetramethylene glycol, polypropylene glycol, and polyethylene glycol; a chain extender; wherein the chain extender is at least one selected from the group consisting of 1,4-butanediol, 1,3-propanediol, diethylene glycol, and 2-methyl-1,3-propanediol; and a chain terminator; wherein the thermoplastic polyurethane resin has a melt index between 2 g / min and 10 g / min, and the ratio of the weight average molecular weight to the number average molecular weight of the thermoplastic polyurethane resin is between 1.5 and 1.75.
[0012] Preferably, the dosage of the diphenylmethane diisocyanate is between 33 parts by weight and 36 parts by weight, the dosage of the polyether polyol is between 53 parts by weight and 57 parts by weight, the dosage of the chain extender is between 7 parts by weight and 9 parts by weight, and the dosage of the chain terminator is between 0.1 parts by weight and 0.3 parts by weight.
[0013] Preferably, the polyether polyol is the high-purity polyoxytetramethylene glycol. The high-purity polyoxytetramethylene glycol contains polyoxytetramethylene glycol and impurities. The impurities include tetrahydrofuran and tetrahydrofuran oligomers, and the high-purity polyoxytetramethylene glycol has a purity between 95% and 99.9%.
[0014] Preferably, the chain terminator is at least one selected from the group of materials consisting of lauryl alcohol, palmityl alcohol, and stearyl alcohol.
[0015] Preferably, the thermoplastic polyurethane resin further comprises an antioxidant, which is at least one selected from the group of materials consisting of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,6-di-tert-butyl-p-cresol, octyl (3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and N,N'-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexanediamine, and the dosage of the antioxidant is between 0.5 parts by weight and 1 part by weight.
[0016] Preferably, the thermoplastic polyurethane resin has a number average molecular weight between 85,000 and 90,000.
[0017] Preferably, the thermoplastic polyurethane resin has a weight average molecular weight between 100,000 and 180,000.
[0018] One beneficial effect of the present invention is that the thermoplastic polyurethane resin and its manufacturing method provided by the present invention can effectively improve the problem that the existing thermoplastic polyurethane is prone to cracking through the technical solutions of "the thermoplastic polyurethane resin has a melt index between 2 g / min and 10 g / min" and "the ratio of the weight average molecular weight to the number average molecular weight of the thermoplastic polyurethane resin is between 1.5 and 1.75".
[0019] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the provided drawings are only for reference and illustration, and are not used to limit the present invention. Description of the Drawings
[0020] Figure 1 It is a flowchart of the manufacturing method of the thermoplastic polyurethane resin according to the embodiment of the present invention.
[0021] Figure 2 It is a gel permeation chromatography result diagram of the thermoplastic polyurethane resin according to the embodiment of the present invention. Detailed Embodiments
[0022] The following is an illustration of the implementation mode of the "thermoplastic polyurethane resin and its manufacturing method" disclosed in the present invention through specific specific examples. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific examples, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. Additionally, the drawings of the present invention are only for simple schematic illustration and are not depicted according to actual dimensions, hereby stating in advance. The following implementation mode will further elaborate on the relevant technical content of the present invention, but the disclosed content is not intended to limit the protection scope of the present invention.
[0023] It should be understood that although terms such as "first", "second", "third", etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another, or one signal from another. Additionally, the term "or" used herein should, depending on the actual situation, possibly include any one or a combination of multiple of the associated listed items.
[0024] [Manufacturing Method of Thermoplastic Polyurethane Resin]
[0025] Please refer to Figure 1 and Figure 2 as shown, Figure 1 is a flowchart of the manufacturing method of the thermoplastic polyurethane resin according to an embodiment of the present invention, and Figure 2 is a gel permeation chromatography result diagram of the thermoplastic polyurethane resin according to an embodiment of the present invention. Figure 2 The waveform information in the gel permeation chromatography test results of
[0026]
[0027] An embodiment of the present invention provides a manufacturing method of a thermoplastic polyurethane resin. The manufacturing method of the thermoplastic polyurethane resin includes a reaction step S110 and a measurement and termination step S120.
[0028] In the reaction step S110, a diphenylmethane diisocyanate, a polyether polyol, and a chain extender are reacted to form a prepolymer. The polyether polyol is selected from at least one of the material group consisting of high-purity polytetramethylene glycol, polypropylene glycol, and polyethylene glycol, and the chain extender is selected from at least one of the material group consisting of 1,4-butanediol, 1,3-propanediol, diethylene glycol, and 2-methyl-1,3-propanediol.
[0029] In the reaction step S110, the amount of diphenylmethane diisocyanate can be between 33 parts by weight and 36 parts by weight, the amount of polyether polyol can be between 53 parts by weight and 57 parts by weight, and the amount of chain extender can be between 7 parts by weight and 9 parts by weight.
[0030] In addition, an antioxidant can be added in the reaction step S110. The antioxidant can be selected from at least one of the materials in the group consisting of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,6-di-tert-butyl-p-cresol, octyl (3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, and the amount of the antioxidant can be between 0.5 part by weight and 1 part by weight.
[0031] In one embodiment, the polyether polyol can be the high-purity polytetramethylene glycol. The high-purity polytetramethylene glycol contains polytetramethylene glycol and impurities. The impurities include tetrahydrofuran and tetrahydrofuran oligomers, and the high-purity polytetramethylene glycol has a purity between 95% and 99.9%. The purity of the high-purity polytetramethylene glycol can be regarded as the weight ratio of polytetramethylene glycol to the whole high-purity polytetramethylene glycol. The aforementioned purity can be obtained, for example, by gas chromatography analysis.
[0032] It is worth mentioning that the purity of generally commercially available polytetramethylene glycol is usually not high enough. Therefore, in the process of preparing thermoplastic polyurethane resin, excessive impurities in commercially available polytetramethylene glycol are likely to cause the generation of oligomers, and the oligomers will cause smoke generation in the subsequent processing process of plastic polyurethane resin (such as lamination). Accordingly, the purity of the high-purity polytetramethylene glycol in this embodiment is between 95% and 99.9%, thereby avoiding the aforementioned smoke generation. Preferably, the purity of the high-purity polytetramethylene glycol is between 99.8% and 99.9%. In addition, if polytetramethylene glycol with a purity of 100% is selected, the overall production cost may be too high.
[0033] In the measuring and terminating step S120, an instantaneous melt index of the prepolymer is measured, and a chain terminator is added when the instantaneous melt index reaches a predetermined melt index to form a thermoplastic polyurethane resin having a melt index. The predetermined melt index is between 7 g / min and 10 g / min, and the melt index is between 2 g / min and 10 g / min. Preferably, the melt index is between 3 g / min and 8 g / min. More preferably, the melt index is between 4 g / min and 7 g / min.
[0034] In the measuring and terminating step S120, the melt index of the thermoplastic polyurethane resin can be controlled and the weight-average molecular weight of the polyurethane resin can be within a specific range by measuring the instantaneous melt index and instantaneously adding the chain terminator.
[0035] Furthermore, the weight-average molecular weight of the thermoplastic polyurethane resin can be between 100,000 and 180,000. It is worth mentioning that if the weight-average molecular weight of the polyurethane resin is too low or too high, it may have a negative impact on the properties of the polyurethane resin. For example, if the weight-average molecular weight of the polyurethane resin is too low (such as less than 100,000), the surface of the film made of the polyurethane resin may be relatively rough (such as having coarse grains). In contrast, if the weight-average molecular weight of the polyurethane resin is too high (such as higher than 180,000), there may be crystal points on the surface of the film made of the polyurethane resin. Preferably, the weight-average molecular weight of the thermoplastic polyurethane resin can be between 110,000 and 160,000. More preferably, the weight-average molecular weight of the thermoplastic polyurethane resin can be between 130,000 and 150,000. In addition, the thermoplastic polyurethane resin has a number-average molecular weight between 85,000 and 90,000.
[0036] In the measuring and terminating step S120, the dosage of the chain terminator can be between 0.1 part by weight and 0.3 part by weight, and the chain terminator can be at least one selected from the group consisting of lauryl alcohol, palmityl alcohol, and stearyl alcohol.
[0037] The ratio of the weight-average molecular weight to the number-average molecular weight of the thermoplastic polyurethane resin is between 1.5 and 1.75. Preferably, the ratio of the weight-average molecular weight to the number-average molecular weight of the thermoplastic polyurethane resin is between 1.6 and 1.65. More preferably, the ratio of the weight-average molecular weight to the number-average molecular weight of the thermoplastic polyurethane resin is about 1.62.
[0038] It is worth mentioning that the ratio of the weight-average molecular weight to the number-average molecular weight can be used as a reference for understanding the dispersity of polymers. When the ratio of the weight-average molecular weight to the number-average molecular weight is approximately equal to 1, it represents that the molecular weight of the polymer shows an average distribution. When the ratio of the weight-average molecular weight to the number-average molecular weight is slightly greater than 1 (such as between 1.5 and 2), it represents that the molecular weight distribution of the polymer is relatively narrow and concentrated. When the ratio of the weight-average molecular weight to the number-average molecular weight is much greater than 1 (such as between 20 and 50), it represents that the molecular weight distribution of the polymer is relatively wide and dispersed.
[0039] Since the ratio of the weight-average molecular weight to the number-average molecular weight of the thermoplastic polyurethane resin in this embodiment is between 1.5 and 1.75, the molecular weight distribution of the thermoplastic polyurethane resin is relatively narrow and concentrated, and there are fewer oligomers generated during the preparation of the thermoplastic polyurethane resin. Therefore, almost no fumes are generated during the subsequent processing of the thermoplastic polyurethane resin.
[0040] [Thermoplastic polyurethane resin]
[0041] The present invention also provides a thermoplastic polyurethane resin, which can be prepared, for example, by the manufacturing method of the aforementioned thermoplastic polyurethane resin, but the present invention is not limited thereto.
[0042] The thermoplastic polyurethane resin contains diphenylmethane diisocyanate, a polyether polyol, a chain extender, and a chain terminator. The polyether polyol is at least one selected from the group consisting of high-purity polyoxytetramethylene glycol, polypropylene glycol, and polyethylene glycol, and the chain extender is at least one selected from the group consisting of 1,4-butanediol, 1,3-propanediol, diethylene glycol, and 2-methyl-1,3-propanediol. The chain terminator can be at least one selected from the group consisting of lauryl alcohol, palmityl alcohol, and stearyl alcohol.
[0043] The dosage of the diphenylmethane diisocyanate can be between 33 parts by weight and 36 parts by weight, the dosage of the polyether polyol can be between 53 parts by weight and 57 parts by weight, the dosage of the chain extender is between 7 parts by weight and 9 parts by weight, and the dosage of the chain terminator can be between 0.1 part by weight and 0.3 part by weight.
[0044] In one embodiment, the polyether polyol can be the high-purity polyoxytetramethylene glycol. The high-purity polyoxytetramethylene glycol contains polyoxytetramethylene glycol and impurities. The impurities include tetrahydrofuran and tetrahydrofuran oligomers, and the high-purity polyoxytetramethylene glycol has a purity between 95% and 99.9%.
[0045] In one embodiment, the thermoplastic polyurethane resin may further comprise an antioxidant selected from at least one of the group consisting of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,6-di-tert-butyl-p-cresol, octyl (3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and N,N'-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexanediamine, and the amount of the antioxidant is between 0.5 parts by weight and 1 part by weight.
[0046] The thermoplastic polyurethane resin has a melt index between 2 g / min and 10 g / min and a weight average molecular weight between 100,000 and 180,000. The thermoplastic polyurethane resin has a number average molecular weight between 85,000 and 90,000, and the ratio of the weight average molecular weight to the number average molecular weight of the thermoplastic polyurethane resin is between 1.5 and 1.75.
[0047] [Experimental data test]
[0048] Hereinafter, the content of the present invention will be described in detail with reference to Examples 1 to 4 and Comparative Examples 1 to 3. However, the following examples are only for helping to understand the present invention, and the scope of the present invention is not limited to these examples.
[0049] Example 1: The thermoplastic polyurethane resin comprises 34.7 parts by weight of diphenylmethane diisocyanate, 55.5 parts by weight of polyether polyol (high-purity polyoxytetramethylene glycol), 8.2 parts by weight of chain extender, 0.5 part by weight of antioxidant, and 1 part by weight of chain terminator, and the high-purity polyoxytetramethylene glycol is 99.8%.
[0050] Example 2: The thermoplastic polyurethane resin comprises 34.7 parts by weight of diphenylmethane diisocyanate, 55.5 parts by weight of polyether polyol (high-purity polyoxytetramethylene glycol), 8.2 parts by weight of chain extender, 1 part by weight of antioxidant, and 0.2 part by weight of chain terminator, and the high-purity polyoxytetramethylene glycol is 99.8%.
[0051] Example 3: The thermoplastic polyurethane resin comprises 34.7 parts by weight of diphenylmethane diisocyanate, 55.5 parts by weight of polyether polyol (high-purity polyoxytetramethylene glycol), 8.2 parts by weight of chain extender, 1 part by weight of antioxidant, and 0.2 part by weight of chain terminator, and the high-purity polyoxytetramethylene glycol is 99.9%.
[0052] Example 4: The thermoplastic polyurethane resin contains 34.7 parts by weight of diphenylmethane diisocyanate, 55.5 parts by weight of polyether polyol (high-purity polyoxytetramethylene glycol), 8.2 parts by weight of chain extender, 1 part by weight of antioxidant, and 0.3 part by weight of chain terminator, and the high-purity polyoxytetramethylene glycol is 99.8%.
[0053] Comparative Example 1: The thermoplastic polyurethane resin contains 34.7 parts by weight of diphenylmethane diisocyanate, 55.5 parts by weight of polyether polyol (high-purity polyoxytetramethylene glycol), 8.2 parts by weight of chain extender, 0 part by weight of antioxidant, and 0.2 part by weight of chain terminator, and the high-purity polyoxytetramethylene glycol is 99.8%.
[0054] Comparative Example 2: The thermoplastic polyurethane resin contains 34.7 parts by weight of diphenylmethane diisocyanate, 55.5 parts by weight of polyether polyol (high-purity polyoxytetramethylene glycol), 8.2 parts by weight of chain extender, 1 part by weight of antioxidant, and 0 part by weight of chain terminator, and the high-purity polyoxytetramethylene glycol is 99.9%.
[0055] Comparative Example 3: The thermoplastic polyurethane resin contains 34.7 parts by weight of diphenylmethane diisocyanate, 55.5 parts by weight of polyether polyol (high-purity polyoxytetramethylene glycol), 8.2 parts by weight of chain extender, 1 part by weight of antioxidant, and 0.2 part by weight of chain terminator, and the high-purity polyoxytetramethylene glycol is 99.5%.
[0056] The component ratios, melt index, weight-average molecular weight, number-average molecular weight, smoke emission, initial yellowness index (Yellowness Index, YI) value, film appearance, and purity of polyoxytetramethylene glycol of the thermoplastic polyurethane resins of Examples 1 to 4 and Comparative Examples 1 to 3 are shown in Table 1 below, and the relevant test methods are described as follows.
[0057] Melt index test: Test according to ASTM D1238.
[0058] Weight-average molecular weight and number-average molecular weight test: Analyze the weight-average molecular weight and number-average molecular weight of the thermoplastic polyurethane resin with a gel permeation chromatography analyzer.
[0059] Smoke emission test: Place 30 g of thermoplastic polyurethane resin pellets in a round tray, use a moisture heating analyzer (model HX204), and compare the smoke emission when heated to 220 °C for 30 minutes.
[0060] Initial yellowness index value test: Test the initial yellowness index value of the thermoplastic polyurethane resin with a spectrophotometer (model X-rite Color-Eye 70000A).
[0061] [Table 1 Composition Ratios, Formulations, and Physicochemical Property Test Results of Examples and Comparative Examples]
[0062]
[0063] [Discussion of Test Results]
[0064] It can be seen from Examples 1 to 4 that by adding a high heat-resistant antioxidant and a chain terminator, the thermoplastic polyurethane resin film has no crystal points, good heat resistance, and significantly reduced smoke emission. It can be seen from Comparative Example 2 that without a chain terminator, the melt index of the thermoplastic polyurethane resin is low, the molecular weight is high, and coarse particles are likely to occur.
[0065] The thermoplastic polyurethane resin of Example 3 has a low initial yellowing index value, low smoke emission, no coarse particles or crystal points on the appearance, and the quality meets the requirements.
[0066] [Advantages of the Examples]
[0067] One of the advantages of the present invention is that the thermoplastic polyurethane resin and its manufacturing method provided by the present invention can effectively improve the problem that the existing thermoplastic polyurethane is prone to cracking through the technical solutions of "the thermoplastic polyurethane resin has a melt index between 2 g / min and 10 g / min" and "the ratio of the weight-average molecular weight to the number-average molecular weight of the thermoplastic polyurethane resin is between 1.5 and 1.75".
[0068] The content disclosed above is only the preferred feasible embodiments of the present invention, and does not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the content of the specification and drawings of the present invention are included in the scope of the patent application of the present invention.
Claims
1. A method for producing a thermoplastic polyurethane resin, characterized in that: The method for producing the thermoplastic polyurethane resin comprises: a reaction step of reacting a diphenylmethane diisocyanate, a polyether polyol and a chain extender to form a prepolymer; wherein the polyether polyol is at least one selected from the group consisting of high-purity polyoxytetramethylene glycol, polyoxypropylene glycol and polyethylene glycol, and the chain extender is at least one selected from the group consisting of 1,4-butanediol, 1,3-propylene glycol, diethylene glycol and 2-methylpropanediol; and a measuring and terminating step of measuring an instantaneous melt index of the prepolymer and adding a chain terminator when the instantaneous melt index reaches a predetermined melt index to form a thermoplastic polyurethane resin having a melt index; wherein the predetermined melt index is between 7 g / min and 10 g / min, and the melt index is between 2 g / min and 10 g / min; Wherein, the ratio of the weight average molecular weight to the number average molecular weight of the thermoplastic polyurethane resin is between 1.5 and 1.
75.
2. The method for producing a thermoplastic polyurethane resin according to claim 1, wherein: The amount of diphenylmethane diisocyanate used is between 33 parts by weight and 36 parts by weight, the amount of polyether polyol used is between 53 parts by weight and 57 parts by weight, the amount of chain extender used is between 7 parts by weight and 9 parts by weight, and the amount of chain terminator used is between 0.1 parts by weight and 0.3 parts by weight.
3. The method for producing a thermoplastic polyurethane resin according to claim 1, wherein: The polyether polyol is the high-purity polyoxytetramethylene glycol, which comprises polyoxytetramethylene glycol and impurities, wherein the impurities comprise tetrahydrofuran and tetrahydrofuran oligomers, and the high-purity polyoxytetramethylene glycol has a purity between 95% and 99.9%.
4. The method for producing a thermoplastic polyurethane resin according to claim 1, wherein: The chain terminator is at least one selected from the group consisting of lauric alcohol, palmityl alcohol and stearyl alcohol.
5. The method for producing a thermoplastic polyurethane resin according to claim 1, wherein: An antioxidant is also added in the reaction step, and the antioxidant is at least one selected from the group consisting of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 2,6-dibutyl-p-cresol, octyl (3,5-di-tert-butyl-4-hydroxyphenyl)propionate and N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, and the amount of the antioxidant is between 0.5 parts by weight and 1 part by weight.
6. The method for producing a thermoplastic polyurethane resin according to claim 1, wherein: The thermoplastic polyurethane resin has a number average molecular weight of 85,000 to 90,000.
7. The method for producing a thermoplastic polyurethane resin according to claim 1, wherein: The weight average molecular weight of the thermoplastic polyurethane resin is between 100,000 and 180,000.
8. A thermoplastic polyurethane resin, characterized in that The thermoplastic polyurethane resin comprises: 1-Diphenylmethane diisocyanate; A polyether polyol; wherein the polyether polyol is at least one selected from the group consisting of high-purity polyoxytetramethylene glycol, polyoxypropylene glycol and polyethylene glycol; a chain extender; wherein the chain extender is at least one selected from the group consisting of 1,4-butanediol, 1,3-propylene glycol, diethylene glycol and 2-methylpropanediol; and A chain terminator; The thermoplastic polyurethane resin has a melt index between 2 g / min and 10 g / min, and a ratio of a weight average molecular weight to a number average molecular weight of the thermoplastic polyurethane resin is between 1.5 and 1.
75.
9. The thermoplastic polyurethane resin according to claim 8, characterized in that The amount of diphenylmethane diisocyanate used is between 33 parts by weight and 36 parts by weight, the amount of polyether polyol used is between 53 parts by weight and 57 parts by weight, the amount of chain extender used is between 7 parts by weight and 9 parts by weight, and the amount of chain terminator used is between 0.1 parts by weight and 0.3 parts by weight.
10. The thermoplastic polyurethane resin according to claim 8, characterized in that The polyether polyol is the high-purity polyoxytetramethylene glycol, which comprises polyoxytetramethylene glycol and impurities, wherein the impurities comprise tetrahydrofuran and tetrahydrofuran oligomers, and the high-purity polyoxytetramethylene glycol has a purity between 95% and 99.9%.
11. The thermoplastic polyurethane resin according to claim 8, characterized in that The chain terminator is at least one selected from the group consisting of lauric alcohol, palmityl alcohol and stearyl alcohol.
12. The thermoplastic polyurethane resin according to claim 8, characterized in that The thermoplastic polyurethane resin further comprises an antioxidant, wherein the antioxidant is at least one selected from the group consisting of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 2,6-dibutyl-p-cresol, octyl (3,5-di-tert-butyl-4-hydroxyphenyl)propionate and N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, and the amount of the antioxidant used is between 0.5 parts by weight and 1 part by weight.
13. The thermoplastic polyurethane resin according to claim 8, characterized in that The thermoplastic polyurethane resin has a number average molecular weight of 85,000 to 90,000.
14. The thermoplastic polyurethane resin according to claim 8, characterized in that The thermoplastic polyurethane resin has a weight average molecular weight between 100,000 and 180,000.