CN115010893A - Thermoplastic polyurethane elastomer and processing technology thereof - Google Patents
Thermoplastic polyurethane elastomer and processing technology thereof Download PDFInfo
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6681—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
- C08G18/6685—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/16—Catalysts
- C08G18/22—Catalysts containing metal compounds
- C08G18/222—Catalysts containing metal compounds metal compounds not provided for in groups C08G18/225 - C08G18/26
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3225—Polyamines
- C08G18/3237—Polyamines aromatic
- C08G18/324—Polyamines aromatic containing only one aromatic ring
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4829—Polyethers containing at least three hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/63—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers
- C08G18/632—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers onto polyethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
Abstract
The invention belongs to the technical field of polyurethane elastomers, and particularly relates to a thermoplastic polyurethane elastomer and a processing technology thereof. The polyurethane elastomer comprises the following raw materials in parts by weight: 57-65 parts of polyether polyol, 12-25 parts of polymer polyol, 15-23 parts of isocyanate, 2-8 parts of chain extender, 0.3-0.75 part of catalyst and solvent; the catalyst is tetrabutyl titanate, and the solvent is ethanol. The polymer polyol is a graft copolymer of styrene, acrylonitrile and polyether polyol, and the solid content is 30-45%; the polyether polyol is preferably glycerol as an initiator, 7-15% of ethylene oxide-terminated vinyl polyether triol with the molecular weight of 3000-5000, and the mechanical property and the wear resistance of the obtained polyurethane elastomer are improved by matching the polyether polyol with the polymer polyol. The thermoplastic polyurethane elastomer prepared by the invention has high mechanical strength, excellent wear resistance and simplified processing technology, and is suitable for large-scale production.
Description
Technical Field
The invention belongs to the technical field of polyurethane elastomers, and particularly relates to a thermoplastic polyurethane elastomer and a processing technology thereof.
Background
The thermoplastic polyurethane elastomer, commonly known as TPU, is a novel organic polymer synthetic material, has excellent properties of high strength, low temperature resistance, high toughness, wear resistance, oil resistance and the like, and can be used for replacing rubber materials and soft polyvinyl chloride materials.
Since the TPU material enters the market, the TPU material is developed rapidly and is widely applied to the fields of mechanical industry, electronic devices, medical appliances, automobile industry, transportation, wearing articles and the like. In recent years, people have increasingly pursued quality of life and experience, and have no need to pursue traditional multifunction and all-purpose, but have demanded a certain functional characteristic to be exerted to the utmost.
Therefore, in order to meet the market demand and law and research and development personnel in the industry focus on researching the heat resistance, high toughness, oil resistance and other characteristics of the thermoplastic polyurethane elastomer, Chinese patent CN104177817A discloses a high-wear-resistance transparent TPU spherical film and a preparation method thereof, wherein inorganic particles of nano ZnO and nano Cr are added in the process of synthesizing the polyurethane elastomer 2 O 3 Nano Al 2 O 3 And nano SiO 2 To improve the abrasion resistance of the polyurethane elastomer. The processing steps mainly comprise mixing inorganic particles such as nano SiC, nano ZnO and the like according to a certain proportion, grinding the mixture to composite nano powder with the particle size of 20-50nm, treating the composite nano powder by using a coupling agent, reacting the composite nano powder with polyurethane prepolymer, a chain extender, a foam stabilizer and the like to prepare a polyurethane-nano powder compound, and further reacting the polyurethane-nano powder compound with auxiliaries such as a chain extender, an antioxidant and the like to prepare the TPU composite material. The method has long and complex processing process and is not beneficial to large-scale putting production; in addition, the added inorganic particles are various in types, and the difference and compatibility between the inorganic particles affect the rigidity of the polyurethane elastomer material.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a thermoplastic polyurethane elastomer and a processing process thereof.
A thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 57-65 parts of polyether polyol, 12-25 parts of polymer polyol, 15-23 parts of isocyanate, 2-8 parts of chain extender, 0.3-0.75 part of catalyst and solvent;
the catalyst is tetrabutyl titanate, and the solvent is ethanol.
Preferably, the polyether polyol is glycerol as an initiator, 7-15% of ethylene oxide-terminated vinyl polyether triol, the functionality of the polyether polyol is 3, and the molecular weight is 3000-5000.
Preferably, the polymer polyol is a graft copolymer of styrene, acrylonitrile and polyether polyol, and the solid content of the polymer polyol is 30-45%.
Preferably, the isocyanate is any one or more of diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate or dicyclohexylmethane diisocyanate.
Preferably, the chain extender consists of diamine and dihydric alcohol, and the mass ratio of the diamine to the dihydric alcohol is 1 (3-5);
the dihydric alcohol is any one or more of ethylene glycol, diethylene glycol, 1, 4-butanediol, 1, 4-cyclohexanediol, propylene glycol, 1, 6-hexanediol, methyl propylene glycol and neopentyl glycol;
the diamine is any one or more of diethyl toluenediamine, 3 '-dichloro-4, 4' -diaminodiphenylmethane and 3, 5-dimethylthio toluenediamine.
A processing technology of thermoplastic polyurethane elastomer comprises the following steps:
s1, mixing polyether polyol and polymer polyol, adding partial isocyanate and a chain extender in a nitrogen atmosphere, and then carrying out chain extension reaction to obtain a polyurethane prepolymer;
and S2, adding the residual isocyanate into the polyurethane prepolymer, adding a catalyst in a nitrogen atmosphere to perform chain extension reaction, then adding a solvent to stir, standing and drying, performing melt reaction through a double-screw extruder, cooling, granulating and drying to obtain the thermoplastic polyurethane elastomer.
Preferably, the S1 specifically includes: stirring and mixing polyether polyol and polymer polyol, raising the temperature to 85-90 ℃ in a nitrogen atmosphere, performing vacuum dehydration until the water content is less than or equal to 0.1%, then cooling to 45-50 ℃, sequentially adding 2/3 total mass of isocyanate and a chain extender, mixing and stirring, and reacting for 4-5h at 105-115 ℃ to obtain the polyurethane prepolymer.
Preferably, the S2 specifically includes: cooling the polyurethane prepolymer to 40-50 ℃, adding the residual 1/3 total mass of isocyanate and a catalyst under the nitrogen atmosphere, reacting for 2-3h at 105-115 ℃, then cooling to 60-70 ℃, adding a solvent, stirring, heating to 80-90 ℃, removing the solvent, standing, drying, carrying out melt reaction by a double-screw extruder at 180-215 ℃, cooling, granulating and drying to obtain the thermoplastic polyurethane elastomer.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention selects glycerin as initiator, 7-15% ethylene oxide end-capped vinyl polyether triol and polyether polyol with molecular weight of 3000-5000, and the activity is high and the system has better rebound resilience; the polymer polyol with the solid content of 30-45 percent, which is formed by graft copolymerization of styrene, acrylonitrile and polyether polyol, can increase the mechanical strength and toughness of the system; the mechanical property and the wear resistance of the obtained polyurethane elastomer are improved by matching the polyether polyol and the polymer polyol; in addition, micromolecular diamine and dihydric alcohol with specified mass ratio are matched to be used as a chain extender, the prepared polyurethane elastomer has long curing time, can be suitable for the fields of spraying and the like, and has better mechanical property;
2. according to the invention, excessive tetrabutyl titanate is used as a catalyst, so that a chain growth reaction can be promoted, and the rigidity strength is improved; adding ethanol solvent along with the reaction, gradually hydrolyzing the excessive tetrabutyl titanate, reducing the reaction speed of the system until the reaction is stopped, and replacing the action of a chain terminator; on the other hand, titanium dioxide formed by gradually hydrolyzing tetrabutyl titanate in ethanol is mixed in the system, so that the wear resistance of the elastomer can be improved;
3. the thermoplastic polyurethane elastomer prepared by the invention has high mechanical strength, excellent wear resistance and simplified processing technology, and is suitable for large-scale production.
Detailed Description
The invention is further described with reference to specific examples.
In the embodiment of the invention, the raw materials are as follows:
polyether polyol: glycerol is taken as an initiator, 7-15% of ethylene oxide is used for sealing vinyl polyether triol, the functionality of polyether polyol is 3, the molecular weight is 3000-5000, and the polyether polyol is purchased from Nanjing Jinxiu chemical industry and is provided with the mark of JQN-330N;
polymer polyol: a graft copolymer of styrene, acrylonitrile and polyether polyol, having a solid content of 45%, available from Nanjing Jinxiu chemical industry under the designation JQN-2045;
isocyanate: a mixture of diphenylmethane diisocyanate (MDI) and isophorone diisocyanate (IPDI) in a mass ratio of 2:1, wherein MDI and IPDI are purchased from Tantariowa;
chain extender: the adhesive is composed of diamine and dihydric alcohol in a mass ratio of 1:3, wherein the dihydric alcohol is ethylene glycol, and the diamine is diethyltoluenediamine;
the ethanol is 95 ethanol; tetrabutyl titanate is commercially available technical grade.
Example 1
A thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 57 parts of polyether polyol, 15 parts of polymer polyol, 17 parts of isocyanate, 3 parts of chain extender, 0.3 part of tetrabutyl titanate catalyst and 30 parts of ethanol solvent.
The processing technology of the polyurethane elastomer comprises the following steps:
(1) sequentially adding polyether polyol and polymer polyol into a reaction kettle, stirring, carrying out vacuum dehydration at 85 ℃ in a nitrogen atmosphere until the water content is less than or equal to 0.1%, then cooling to 45 ℃, sequentially adding 2/3 total amount of isocyanate and chain extender, mixing and stirring, raising the temperature to 107 ℃, and reacting for 4 hours to obtain a polyurethane prepolymer;
(2) cooling the polyurethane prepolymer prepared in the step (1) to 45 ℃, adding the residual isocyanate 1/3 in total amount and nitrogen atmosphere, adding a catalyst, raising the temperature to 105 ℃, reacting for 2 hours, cooling to 60 ℃, adding a solvent, stirring uniformly, raising the temperature to 80 ℃, removing the ethanol solvent, standing, drying, carrying out melt reaction by a double-screw extruder at 180 ℃, cooling, granulating, and drying to obtain the thermoplastic polyurethane elastomer.
Example 2
A thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 60 parts of polyether polyol, 18 parts of polymer polyol, 20 parts of isocyanate, 7 parts of chain extender, 0.6 part of tetrabutyl titanate catalyst and 50 parts of ethanol solvent.
The processing technology of the polyurethane elastomer comprises the following steps:
(1) sequentially putting polyether polyol and polymer polyol into a reactor, stirring, carrying out vacuum dehydration at 88 ℃ in a nitrogen atmosphere until the water content is less than or equal to 0.1%, then cooling to 47 ℃, sequentially adding 2/3 total amount of isocyanate and chain extender, mixing and stirring, raising the temperature to 110 ℃, and reacting for 4.5 hours to obtain a polyurethane prepolymer;
(2) and (2) cooling the polyurethane prepolymer prepared in the step (1) to 40 ℃, adding the residual 1/3 total amount of isocyanate and nitrogen atmosphere, adding a catalyst, raising the temperature to 108 ℃, reacting for 3 hours, cooling to 64 ℃, adding an ethanol solvent, uniformly stirring, raising the temperature to 90 ℃, removing the solvent, standing, drying, carrying out melt reaction by a double-screw extruder at the temperature of 205 ℃, cooling, granulating and drying to obtain the thermoplastic polyurethane elastomer.
Example 3
A thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 65 parts of polyether polyol, 25 parts of polymer polyol, 23 parts of isocyanate, 8 parts of chain extender, 0.75 part of tetrabutyl titanate catalyst and 70 parts of ethanol solvent.
The processing technology of the polyurethane elastomer comprises the following steps:
(1) sequentially putting polyether polyol and polymer polyol into a reactor, stirring, carrying out vacuum dehydration at 90 ℃ in a nitrogen atmosphere until the water content is less than or equal to 0.1%, then cooling to 50 ℃, sequentially adding 2/3 total amount of isocyanate and chain extender, mixing and stirring, raising the temperature to 115 ℃, and reacting for 5 hours to obtain a polyurethane prepolymer;
(2) and (2) cooling the polyurethane prepolymer prepared in the step (1) to 50 ℃, adding the residual 1/3 total amount of isocyanate and nitrogen atmosphere, adding a catalyst, raising the temperature to 115 ℃, reacting for 3 hours, cooling to 70 ℃, adding a solvent, uniformly stirring, raising the temperature to 85 ℃, removing the ethanol solvent, standing, drying, carrying out melt reaction by a double-screw extruder at the temperature of 215 ℃, cooling, granulating and drying to obtain the thermoplastic polyurethane elastomer.
Example 4
A thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 65 parts of polyether polyol, 25 parts of polymer polyol, 23 parts of isocyanate, 8 parts of chain extender and 0.75 part of dodecyl mercaptan.
The processing technology of the polyurethane elastomer comprises the following steps:
(1) sequentially putting polyether polyol and polymer polyol into a reactor, stirring, raising the temperature to 90 ℃ in a nitrogen atmosphere, dehydrating in vacuum until the water content is less than or equal to 0.1%, then cooling to 50 ℃, sequentially adding 2/3 total amount of isocyanate and a chain extender, mixing and stirring, raising the temperature to 115 ℃, and reacting for 5 hours to obtain a polyurethane prepolymer;
(2) and (2) cooling the polyurethane prepolymer prepared in the step (1) to 50 ℃, adding the residual 1/3 total amount of isocyanate in nitrogen atmosphere, raising the temperature to 115 ℃, reacting for 3 hours, adding dodecanethiol, uniformly stirring, standing for 15min, carrying out melt reaction by a double-screw extruder at the temperature of 215 ℃, cooling, granulating and drying to obtain the thermoplastic polyurethane elastomer.
Example 5
A thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 90 parts of polyether polyol, 23 parts of isocyanate, 8 parts of a chain extender, 0.75 part of tetrabutyl titanate catalyst and 70 parts of an ethanol solvent.
The processing technology of the polyurethane elastomer comprises the following steps:
(1) putting polyether glycol into a reactor, stirring, raising the temperature to 90 ℃ in a nitrogen atmosphere, carrying out vacuum dehydration until the water content is less than or equal to 0.1%, then cooling to 50 ℃, sequentially adding 2/3 total amount of isocyanate and chain extender, mixing and stirring, raising the temperature to 115 ℃, and reacting for 5 hours to obtain a polyurethane prepolymer;
(2) and (2) cooling the polyurethane prepolymer prepared in the step (1) to 50 ℃, adding the residual 1/3 total amount of isocyanate and nitrogen atmosphere, adding a catalyst, raising the temperature to 115 ℃, reacting for 3 hours, cooling to 70 ℃, adding an ethanol solvent, uniformly stirring, raising the temperature to 90 ℃, removing the ethanol solvent, standing, drying, carrying out melt reaction by a double-screw extruder at the temperature of 215 ℃, cooling, granulating and drying to obtain the thermoplastic polyurethane elastomer.
Example 6
A thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 65 parts of polyether polyol, 25 parts of polymer polyol, 23 parts of isocyanate, 8 parts of chain extender and 0.75 part of tetrabutyl titanate catalyst.
The processing technology of the polyurethane elastomer comprises the following steps:
(1) sequentially putting polyether polyol and polymer polyol into a reactor, stirring, raising the temperature to 90 ℃ in a nitrogen atmosphere, dehydrating in vacuum until the water content is less than or equal to 0.1%, then cooling to 50 ℃, sequentially adding 2/3 total amount of isocyanate and a chain extender, mixing and stirring, raising the temperature to 115 ℃, and reacting for 5 hours to obtain a polyurethane prepolymer;
(2) and (2) cooling the polyurethane prepolymer prepared in the step (1) to 50 ℃, adding the residual 1/3 total amount of isocyanate and nitrogen atmosphere, adding a catalyst tetrabutyl titanate, raising the temperature to 115 ℃, reacting for 3 hours, standing for 15min, carrying out melt reaction by a double-screw extruder at the temperature of 215 ℃, cooling, granulating and drying to obtain the thermoplastic polyurethane elastomer.
The thermoplastic polyurethane elastomers prepared in examples 1 to 6 were subjected to a performance test, and shore hardness of each group of thermoplastic elastomers was measured according to the specification of astm d2240 standard test method for hardness of durometer. The elongation of each group of thermoplastic elastomers was measured according to the ASTM D412 vulcanized rubber and thermoplastic elastomer tensile test method. The abrasion resistance of each group of thermoplastic elastomers was measured according to the regulations of ISO4649 determination of abrasion resistance of vulcanizates or thermoplastic rubbers. The results are shown in Table 1.
Table 1 table of test results of examples 1 to 6
| Shore hardness (A/D) | Tensile strength/MPa | Amount of wear (mm) 3 ) | |
| Example 1 | 80A | 42 | 21 |
| Example 2 | 85A | 43 | 20 |
| Example 3 | 85A | 46 | 18 |
| Example 4 | 80A | 37 | 35 |
| Example 5 | 80A | 33 | 25 |
| Example 6 | 85A | 39 | 33 |
Examples 1 to 3 are thermoplastic polyurethane elastomers prepared according to the scheme of the invention, and the data in Table 1 show that the Shore hardness of the polyurethane elastomers is more than 80A, and the abrasion loss is 18 to 21mm 3 The thermoplastic polyurethane elastomer obtained by the scheme of the invention has good mechanical property and excellent wear resistance.
Example 4 compared to example 3, the abrasion loss was significantly increased by replacing the catalyst tetrabutyl titanate and ethanol solvent with the chain terminator dodecanethiol. Example 5 compared to example 3, the mechanical properties of the final elastomer are reduced by not using the polymer polyol, but by selecting a polyether polyol instead of the two compositions. In example 6, no ethanol solvent was added subsequently, hydrolysis of tetrabutyl titanate was affected, and the wear resistance was lowered.
The above detailed description is only for explaining the present application and not for limiting the present application, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present application.
Claims (8)
1. A thermoplastic polyurethane elastomer characterized by: the composite material comprises the following raw materials in parts by weight: 57-65 parts of polyether polyol, 12-25 parts of polymer polyol, 15-23 parts of isocyanate, 2-8 parts of chain extender, 0.3-0.75 part of catalyst and solvent;
the catalyst is tetrabutyl titanate, and the solvent is ethanol.
2. The thermoplastic polyurethane elastomer according to claim 1, wherein: the polyether polyol is glycerol serving as an initiator and ethylene oxide-terminated vinyl polyether triol with the content of 7-15%, and has the functionality of 3 and the molecular weight of 3000-5000.
3. The thermoplastic polyurethane elastomer according to claim 1, wherein: the polymer polyol is a graft copolymer of styrene, acrylonitrile and polyether polyol, and the solid content of the polymer polyol is 30-45%.
4. The thermoplastic polyurethane elastomer according to claim 1, wherein; the isocyanate is any one or more of diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate or dicyclohexylmethane diisocyanate.
5. The thermoplastic polyurethane elastomer according to claim 1, wherein: the chain extender consists of diamine and dihydric alcohol, and the mass ratio of the diamine to the dihydric alcohol is 1 (3-5);
the dihydric alcohol is any one or more of ethylene glycol, diethylene glycol, 1, 4-butanediol, 1, 4-cyclohexanediol, propylene glycol, 1, 6-hexanediol, methyl propylene glycol and neopentyl glycol;
the diamine is any one or more of diethyl toluenediamine, 3 '-dichloro-4, 4' -diaminodiphenylmethane and 3, 5-dimethylthio toluenediamine.
6. The process for producing a thermoplastic polyurethane elastomer according to any one of claims 1 to 5, wherein: the method comprises the following steps:
s1, mixing polyether polyol and polymer polyol, adding partial isocyanate and a chain extender in a nitrogen atmosphere, and then carrying out chain extension reaction to obtain a polyurethane prepolymer;
and S2, adding the rest isocyanate into the polyurethane prepolymer, adding a catalyst in a nitrogen atmosphere to perform chain extension reaction, then adding a solvent to perform stirring, standing and drying, performing melt reaction by a double-screw extruder, cooling, granulating and drying to obtain the thermoplastic polyurethane elastomer.
7. The process for producing a thermoplastic polyurethane elastomer according to claim 6, wherein: the S1 specifically includes: stirring and mixing polyether polyol and polymer polyol, raising the temperature to 85-90 ℃ in a nitrogen atmosphere, performing vacuum dehydration until the water content is less than or equal to 0.1%, then cooling to 45-50 ℃, sequentially adding 2/3 total mass of isocyanate and a chain extender, mixing and stirring, and reacting for 4-5h at 105-115 ℃ to obtain the polyurethane prepolymer.
8. The process for producing a thermoplastic polyurethane elastomer according to claim 6, wherein: the S2 specifically includes: cooling the polyurethane prepolymer to 40-50 ℃, adding the residual 1/3 total mass of isocyanate and a catalyst under the nitrogen atmosphere, reacting for 2-3h at 105-115 ℃, then cooling to 60-70 ℃, adding a solvent, stirring, heating to 80-90 ℃, removing the solvent, standing, drying, carrying out melt reaction by a double-screw extruder at 180-215 ℃, cooling, granulating and drying to obtain the thermoplastic polyurethane elastomer.
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