Polyurethane microporous elastomer with strong adhesion and high moisture permeability as well as preparation method and application of polyurethane microporous elastomer

Abstract

The invention belongs to the technical field of polyurethane elastomers, and particularly relates to a high-adhesion and high-moisture-permeability polyurethane microporous elastomer as well as a preparation method and application thereof. Comprising a component A and a component B, wherein the component A comprises 55-80 parts of polyester polyol P1; 20 to 45 parts of polyester polymer polyol P2; 5 to 10 parts of silane modified polyether polyol S1; 3 to 10 parts of a chain extender; 1-2 parts of a cross-linking agent; 0.3 to 0.6 part of a foam stabilizer; 0.5 to 0.8 part of a foaming agent; 1-2 parts of a catalyst; the component B comprises the following components in parts by weight: 10-20 parts of polyester polyol P1; 2 to 10 parts of silane modified polyether polyol S1; and 70 to 88 parts of isocyanate. The prepared polyurethane microporous elastomer not only has excellent bonding strength and stable processability (no bubble is generated), but also has remarkably improved moisture permeability, comfort, high elasticity and folding resistance when being used as a sole material.

Description

Technical Field

[0001] This invention belongs to the field of polyurethane elastomer technology, specifically relating to a strong-adhesion, highly moisture-permeable polyurethane microporous elastomer, its preparation method, and its application. Background Technology

[0002] Polyurethane (PU) microporous elastomers are widely used in footwear materials, especially in the production of zip-up shoes, due to their excellent elasticity, comfort, and processing adaptability. However, the traditional production model for PU zip-up shoes is facing severe challenges. On the one hand, raw material and labor costs continue to rise; on the other hand, fierce market competition has driven down finished product prices. Under this dual pressure, profit margins for these products have been significantly compressed, and their market competitiveness has weakened. To overcome this predicament, in recent years many manufacturers have begun to adopt thermoplastic polyurethane (TPU) and PU composite processes: by integrating the impact resistance and support of the TPU sole, the comfort and elasticity of the PU base, the abrasion resistance and high-gloss texture of the TPU patch / film, and the high-quality leather or fiber fabric upper, the advantages of the materials are complemented and product performance is upgraded.

[0003] This composite process offers significant product differentiation advantages: the upper is smooth and delicate, and the application of the TPU film gives it a metallic sheen, greatly enhancing the product's appearance and quality; the materials are firmly bonded, effectively reducing the risk of delamination; at the same time, the process is simplified and optimized, reducing reliance on operator skill. Sports shoes, casual shoes, and fashion shoes produced using this process stand out in a market saturated with similar products, opening up new profit growth points and competitive advantages for manufacturers, and becoming one of the important directions for industry transformation.

[0004] While traditional silane coupling agents can improve adhesion, they are prone to accelerated decomposition at the peak foaming temperature of PU (110-130℃). Therefore, using silane coupling agents alone is not an efficient solution for improving PU adhesion. Currently, to address the problems of poor adhesion between PU footwear materials and other materials, and the tendency for products to develop air bubbles, while ensuring the wearing experience of finished shoes (including breathability, high elasticity, flexural strength, and comfort), developing a polyurethane microporous elastomer that combines reliable adhesion with a smooth surface without sacrificing the core advantages of footwear materials (comfort, elasticity, and flexural strength) has become an urgently needed innovative solution in the industry. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a strong adhesive and highly breathable polyurethane microporous elastomer. This elastomer not only has excellent adhesive strength and stable processing performance (no bubble generation), but also significantly improves the moisture permeability, comfort, high elasticity and flexural strength of the material used as a shoe sole.

[0006] Another objective of this invention is to provide a method for preparing and applying a highly adhesive and moisture-permeable polyurethane microporous elastomer.

[0007] The technical solution adopted in this invention is as follows: The strongly adhesive, highly moisture-permeable polyurethane microporous elastomer comprises component A and component B in a mass ratio of 100:(60-75). Component A comprises the following raw materials in parts by weight: Polyester polyol P1: 55-80 parts; Polyester polymer polyol P2: 20-45 parts; Silane-modified polyether polyol S1: 5-10 parts; Chain extender: 3-10 parts; Crosslinking agent: 1-2 parts; Foaming agent: 0.3-0.6 parts; Foaming agent: 0.5-0.8 parts; Catalyst: 1-2 parts; Component B comprises the following raw materials in parts by mass: Polyester polyol P1: 10-20 parts; Silane-modified polyether polyol S1: 2-10 parts; Isocyanate: 70-88 parts; The silane-modified polyether polyol S1 is prepared by reacting polyether polyol Q1 with a silane coupling agent, and its number-average molecular weight is 3000-4500 g / mol, and its functionality is 2-3. The polymer monomer of the polyether polyol Q1 is one or more of ethylene oxide or propylene oxide, with a number average molecular weight of 3000-4000 g / mol and a functionality of 2-3; preferably ED-28 produced by Shandong Lanxing Dongda Co., Ltd. or INOVOL F5631 produced by Shandong Yinuowei New Materials Co., Ltd. The silane coupling agent is preferably a silane coupling agent containing an epoxy group.

[0008] The polyester polyol P1 is prepared by esterification condensation reaction of small molecule polyols (ethylene glycol, diethylene glycol, 1,4-butanediol) and diacids (adipic acid, glutaric acid, succinic acid, terephthalic acid), and has a number-average molecular weight of 1000-2500 g / mol and a functionality of 2-2.06; preferably, it is one or more of PE-2410, PE-2415, PE-4010, PE-4020, PE-2520 and PE-2325 produced by Shandong Yinuowei Polyurethane Co., Ltd.

[0009] The polyester polymer polyol P2 is prepared by polycondensation reaction of diol and adipic acid to obtain a polyester prepolymer with a number average molecular weight of 2000 g / mol, followed by graft copolymerization reaction with styrene, and its functionality is 2. Preferably, it is one of P-245T produced by Shandong Yinuowei Polyurethane Co., Ltd. or PM-245 produced by Hoocker, Spain.

[0010] The preparation method of the silane-modified polyether polyol S1 includes the following steps: Polyether polyol Q1 is added to a reaction vessel and dehydrated under vacuum until the water content is <0.03 wt.%. A silane coupling agent is added, followed by the catalyst bismuth neodecanoate and antioxidant 1027. The mixture is stirred while heating to 90-100℃ and maintained at this temperature for 2-4 hours. Unreacted monomers and small molecule byproducts are removed under a vacuum of -0.090 MPa for 1-2 hours to obtain the silane-modified polyether polyol S1. The molar ratio of the polyether polyol Q1 to the silane coupling agent is 1:(1-1.5).

[0011] The chain extender is one or more of ethylene glycol, diethylene glycol, or 1,4-butanediol; the crosslinking agent is one or more of diethanolamine, triethanolamine, or glycerol.

[0012] The foaming agent is a polysiloxane-olefin oxide block copolymer. Preferably, it is B 8870 manufactured by Evonik Specialty Chemicals (Shanghai) Co., Ltd., or BL-5638 manufactured by Shanghai Maihao Chemical Technology Co., Ltd.

[0013] The foaming agent is water.

[0014] The catalyst is an amine catalyst. Preferably, it is one of DXD-01C, DXD-04C, or DXD-07C produced by Shandong Yinuowei Polyurethane Co., Ltd.

[0015] The isocyanate is one or more of 4,4'-diphenylmethane diisocyanate or carbodiimide-modified MDI.

[0016] The total mass fraction of polyester polyol P1 and polyester polymer polyol P2 in component A is 100 parts.

[0017] The -NCO content of component B is 22-28 wt.%.

[0018] The method for preparing the strongly adhesive, highly moisture-permeable polyurethane microporous elastomer includes the following steps: 1) Add polyester polyol P1, polyester polymer polyol P2, silane-modified polyether polyol S1, chain extender, crosslinking agent, foam leveling agent, foaming agent and catalyst into a reaction vessel, stir at atmospheric pressure and 60-70℃ for 2-3 hours to obtain component A. 2) Add polyester polyol P1 and silane-modified polyether polyol S1 into a reactor, control the material temperature at 40-50℃, add isocyanate, and react at 70-80℃ for 1-3 hours to obtain component B. 3) Mix components A and B, then inject the mixture into a mold at a temperature of 40-50℃ and cure for 5-10 minutes to obtain a strongly adhesive, highly moisture-permeable polyurethane microporous elastomer.

[0019] The aforementioned strong-adhesion, highly moisture-permeable polyurethane microporous elastomer is used in the preparation of shoe soles.

[0020] The method for preparing the shoe sole includes the following steps: Inject components A and B into the material tank of the casting machine respectively. Control the mold temperature at 40-50℃. Place TPU decorative patches or support sheets and TPU film at the bottom of the mold. Inject components A and B into the mold according to the set ratio through the casting machine. Then install the matching accessories, close and lock the mold immediately. After 5-10 minutes, open the mold to obtain the shoe sole.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention uses silane-modified polyether polyol S1, whose flexible long chain segment can enhance the dispersion uniformity of silane coupling agent in polyurethane resin, while reducing the breakage rate of Si-OC bond during use, significantly improving the flexibility of shoe material in humid environment, and optimizing the wear permeability with microporous structure. (2) The silane groups in the silane-modified polyether polyol S1 used in this invention can play a coupling role at the interface between PU and TPU, and between PU and leather, thereby enhancing the bonding strength of the multiphase interface and effectively solving the problem of non-adhesion in composite shoe materials. (3) By introducing a polyester polymer polyol P2 containing a benzene ring structure, the rigid benzene ring structure and the flexible polyester chain segment work together to regulate the foaming kinetics process, balance the difference between the foaming rate and the gelation rate, suppress bubble generation, and make the surface of the elastomer achieve mirror-level smoothness. (4) The strong adhesion and high moisture permeability polyurethane microporous elastomer prepared by the present invention has both aesthetic appeal and wearing comfort. The preparation process has a high tolerance for error, which can significantly improve the first-pass yield and reduce post-processing steps. The product surface is delicate and smooth without bubble defects, and has excellent adhesion performance with TPU, leather and other materials, which can meet the preparation requirements of mid-to-high-end shoe models. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments, but these embodiments do not limit the implementation of the present invention.

[0023] Unless otherwise specified, the raw materials used in the examples and comparative examples are all commercially available materials, and the process methods used in the examples and comparative examples are all conventional methods in the art.

[0024] The following is a description of some of the raw materials used in the examples and comparative examples: Polyester polyols P1: PE-2410, PE-2415, PE-4010, PE-4020, PE-2520, and PE-2325 were all purchased from Shandong Yinuowei Polyurethane Co., Ltd. Polyether polyol Q1: ED-28, purchased from Shandong Lanxing Dongda Co., Ltd.; INOVOL F5631, purchased from Shandong Yinuowei New Materials Co., Ltd. Polyester polymer polyol P2: P-245T, purchased from Shandong Yinuowei Polyurethane Co., Ltd.; PM-245, purchased from Hoocker, Spain. Silane coupling agent: KH-560, purchased from Hangzhou Jessica Chemical Co., Ltd.; Silane-modified polyether polyols S1: S-330, S-240; The preparation method of S-330 includes the following steps: 100 kg of INOVOL F5631 is added to a reaction vessel, vacuumed to -0.09 MPa, heated to 90°C, and vacuum dehydrated for 30 min until the moisture content is <0.03 wt.%. After the moisture content is qualified, 11.8 kg of KH-560 is added, followed by 200 g of bismuth neodecanoate and 50 g of antioxidant 1027. The mixture is stirred while heating to 100°C and kept at this temperature for 2 h. Unreacted monomers and small molecule byproducts are removed under a vacuum of -0.090 MPa for 1 h. The mixture is then cooled to 60°C and discharged to obtain a colorless, transparent, viscous liquid, S-330, with a viscosity of 2300 mPa·s and a number-average molecular weight of 3350 g / mol.

[0025] The preparation method of S-240 includes the following steps: 100 kg of ED-28 is added to a reaction vessel, vacuumed to -0.09 MPa, heated to 95°C, and vacuum dehydrated for 20 min until the moisture content is <0.03 wt.%. After the moisture content is qualified, 6 kg of KH-560 is added, followed by 240 g of bismuth neodecanoate and 60 g of antioxidant 1027. The mixture is stirred while heating to 100°C and kept at this temperature for 4 h. Unreacted monomers and small molecule byproducts are removed under a vacuum of -0.09 MPa for 2 h. The mixture is then cooled to 60°C and discharged to obtain a colorless, transparent, viscous liquid, S-240, with a viscosity of 2800 mPa·s and a number-average molecular weight of 4250 g / mol.

[0026] Foaming agents: B 8870, purchased from Evonik Specialty Chemicals (Shanghai) Co., Ltd.; BL-5638, purchased from Shanghai Maihao Chemical Technology Co., Ltd.

[0027] Catalysts: DXD-01C, DXD-04C, and DXD-07C were all purchased from Shandong Yinuowei Polyurethane Co., Ltd. Isocyanates: MDI-100 and CDMDI-100L were purchased from Wanhua Chemical Group Co., Ltd.; CD-C was purchased from Covestro AG, Germany.

[0028] Example 1 The method for preparing the strongly adhesive, highly moisture-permeable polyurethane microporous elastomer includes the following steps: 1) Turn the stirring speed to 35Hz, and add 55kg of PE-2410, 45kg of P-245T, 5kg of S-330, 10kg of ethylene glycol, 1kg of diethanolamine, 0.3kg of B 8870, 0.5kg of water and 1kg of DXD-01C into the reactor in sequence. Stir at 60℃ under normal pressure for 2 hours to obtain component A. 2) Add 10 kg of PE-2410 and 2 kg of S-330 into the reactor in sequence, start stirring, control the material temperature at 40℃, add 73 kg of MDI-100 and 15 kg of CDMDI-100L, react at 70℃ for 3 hours, and obtain component B with -NCO content of 28wt.%; 3) Inject components A and B into the material tank of the low-pressure casting machine respectively, mix them at a mass ratio of 100:75, and then pour them into a mold at a temperature of 40℃. After curing for 10 minutes, open the mold to obtain a strong adhesive and highly moisture-permeable polyurethane microporous elastomer.

[0029] Example 2 The method for preparing the strongly adhesive, highly moisture-permeable polyurethane microporous elastomer includes the following steps: 1) Turn the stirring speed to 35Hz, and add 60kg of PE-2415, 10kg of PE-2325, 30kg of PM-245, 10kg of S-240, 3kg of 1,4-butanediol, 2kg of triethanolamine, 0.3kg of B 8870, 0.3kg of BL-5638, 0.8kg of water, and 2kg of DXD-07C into the reactor in sequence. Stir at atmospheric pressure and 65℃ for 2.5h to obtain component A. 2) Add 20 kg of PE-2415 and 10 kg of S-240 into the reactor in sequence, start stirring, control the material temperature at 45℃, add 70 kg of MDI-100, and react at 75℃ for 2.5 h to obtain component B with a -NCO content of 22 wt.%. 3) Inject components A and B into the material tank of the low-pressure casting machine respectively, mix them at a mass ratio of 100:60, and then pour them into a mold at a temperature of 50°C. After curing for 5 minutes, open the mold to obtain a strong adhesive and highly moisture-permeable polyurethane microporous elastomer.

[0030] Example 3 The method for preparing the strongly adhesive, highly moisture-permeable polyurethane microporous elastomer includes the following steps: 1) Turn the stirring speed to 35Hz, and add 65kg of PE-4010, 15kg of PE-2520, 20kg of P-245T, 7kg of S-330, 4kg of ethylene glycol, 1kg of diethylene glycol, 1kg of glycerol, 1kg of triethanolamine, 0.5kg of BL-5638, 0.7kg of water, and 1.5kg of DXD-01C into the reactor in sequence. Stir at atmospheric pressure and 70℃ for 3 hours to obtain component A. 2) Add 15kg of PE-4010 and 8kg of S-330 into the reactor in sequence, start stirring, control the material temperature at 50℃, add 72kg of MDI-100 and 5kg of CD-C, and react at 80℃ for 1 hour to obtain component B with a -NCO content of 24wt.%. 3) Inject components A and B into the material tank of the low-pressure casting machine respectively, mix them at a mass ratio of 100:72, and then pour them into a mold at a temperature of 45℃. After curing for 7 minutes, open the mold to obtain a strong adhesive and highly moisture-permeable polyurethane microporous elastomer.

[0031] Example 4 The method for preparing the strongly adhesive, highly moisture-permeable polyurethane microporous elastomer includes the following steps: 1) Turn the stirring speed to 35Hz, and add 45kg of PE-4020, 18kg of PE-2415, 37kg of PM-245, 8kg of S-240, 5kg of ethylene glycol, 2kg of 1,4-butanediol, 1.2kg of glycerol, 0.4kg of B 8870, 0.6kg of water and 1.7kg of DXD-04C into the reactor in sequence. Stir at 70℃ under normal pressure for 2.5h to obtain component A. 2) Add 19 kg of PE-4020 and 6 kg of S-240 into the reactor in sequence, start stirring, control the material temperature at 48℃, add 55 kg of MDI-100 and 20 kg of CDMDI-100L, and react at 78℃ for 2 hours to obtain component B with a -NCO content of 23.5 wt.%. 3) Inject components A and B into the material tank of the low-pressure casting machine respectively, mix them at a mass ratio of 100:70, and then pour them into a mold at a temperature of 48℃. After curing for 8 minutes, open the mold to obtain a strong adhesive and highly moisture-permeable polyurethane microporous elastomer.

[0032] Comparative Example 1 The difference from Example 1 is that S-330 is not added to component A, otherwise it is the same as Example 1.

[0033] Comparative Example 2 The difference from Example 1 is that S-330 is in component B, otherwise it is the same as in Example 1.

[0034] Comparative Example 3 The difference from Example 1 is that the amount of PE-2410 in component A is 100 kg and the amount of P-245T is 0, while the rest is the same as in Example 1.

[0035] Comparative Example 4 The difference from Example 1 is that the amount of S-330 used in both components A and B is 20 kg, while the rest is the same as in Example 1.

[0036] The polyurethane microporous elastomers prepared in Examples 1-4 and Comparative Examples 1-4 were subjected to performance tests, and the test methods are as follows: Density (kg / m³) 3 (The test shall be conducted in accordance with GB / T 6343-2009;) Hardness (C): Tested according to GB / T 2411-2008; Tensile strength (MPa): Tested according to GB / T 528-2009; Strength retention rate under damp heat aging (%): Tested according to GB / T 12000-2003.

[0037] Folding endurance (ten thousand times): Tested according to SATRA TM 92.

[0038] Polyurethane microporous elastomers prepared in Examples 1-4 and Comparative Examples 1-4 were used to prepare samples, and the peel strength (N / cm) of the prepared samples was tested according to ASTM F904. The sample preparation method is as follows: Components A and B are injected into the material tank of the casting machine, and the mold temperature is controlled at 45℃. A 0.1mm thick TPU film (E595T, purchased from Shandong Yinuowei Polyurethane Co., Ltd.) is placed at the bottom of a 0.2L (20×16.5×0.6cm) mold. Components A and B are injected into the mold in the set ratio through the casting machine. The mold is immediately closed and locked. After 8 minutes, the mold is opened to obtain the sample.

[0039] Table 1 Performance Test Results

[0040] The product density of Examples 1-4 of this invention is 350-390 kg / m³. 3The hardness is 60-78C, and the tensile strength, peel strength, wet heat aging strength retention rate, and folding resistance all meet the technical specifications of polyurethane shoe resin. Conventional polyurethane shoe resins without silane-modified polyether polyols are prone to surface bubbles and poor adhesion. Their performance deteriorates after exposure to humid environments. The products in Examples 1-4 of this invention have smooth surfaces, even achieving a mirror-like finish. After wet heat aging, the products retain over 90% of their performance. This invention introduces silane-modified polyether segments to impart controllable hydrophilicity to the system, enhancing the uniformity of coupling agent dispersion in the polyurethane resin. Utilizing flexible long segments reduces the Si-OC bond breakage rate, significantly improving the flexibility and breathability of the shoe material in humid environments, effectively solving the problem of stuffiness in traditional PU shoes. By using coupling agents to build molecular bridges between two materials, the compatibility of PU resin with other materials is enhanced, improving the adhesion and peel strength between the phase interfaces of the product, resulting in PU shoes with excellent adhesion, no bubbles, and a smooth surface.

[0041] Comparative Examples 1-4 were compared with Example 1. At similar densities, in Comparative Example 1, the absence of silane-modified polyether polyol in component A led to resin interface adhesion failure, decreased peel strength, and a drop in wet heat aging strength retention rate to 65%, with pitting and delamination appearing on the product surface. In Comparative Example 2, the absence of silane-modified polyether polyol in component B resulted in a significant decrease in peel strength, a drop in wet heat aging strength retention rate to 72%, and defects caused by mold sticking on the product surface. In Comparative Example 3, reducing the polyester polymer polyol to 0 parts resulted in bubbles and wrinkles in the product, with a significant decrease in tensile strength, hardness, and flexural strength. This indicates that without polymer polyol in the formulation system, and without the synergistic effect of polyester polymer polyol and silane-modified polyether polyol, maintaining cell strength is detrimental. In Comparative Example 4, the amount of silane-modified polyether polyol in both components A and B was increased to 20 parts, resulting in a decrease in tensile strength; although the wet heat retention rate increased somewhat, mold sticking defects appeared, and the flexural strength dropped sharply, failing to meet the flexural strength requirements for shoe sole products. Therefore, it is recommended that the amount of silane-modified polyether polyol added be controlled within 10 parts (i.e., the addition range of Examples 2-4).

[0042] In summary, the strongly adhesive and highly moisture-permeable polyurethane microporous elastomer prepared using this invention has a molding density of 350-390 kg / m³. 3 Under conditions of hardness of 60-78C, it can achieve a defect-free surface, excellent bonding effect, high strength retention rate under humid heat aging, and excellent flexural resistance of products, which can meet the production and use requirements in humid heat environments.

Claims

1. A highly adhesive and moisture-permeable polyurethane microporous elastomer, characterized in that, Includes component A and component B in a mass ratio of 100:(60-75); Component A comprises the following raw materials in parts by weight: Polyester polyol P1: 55-80 parts; Polyester polymer polyol P2: 20-45 parts; Silane-modified polyether polyol S1: 5-10 parts; Chain extender: 3-10 parts; Crosslinking agent: 1-2 parts; Foaming agent: 0.3-0.6 parts; Foaming agent: 0.5-0.8 parts; Catalyst: 1-2 parts; Component B comprises the following raw materials in parts by mass: Polyester polyol P1: 10-20 parts; Silane-modified polyether polyol S1: 2-10 parts; Isocyanate: 70-88 parts; The silane-modified polyether polyol S1 is prepared by reacting polyether polyol Q1 with a silane coupling agent, and its number-average molecular weight is 3000-4500 g / mol, and its functionality is 2-3. The polymer monomer of the polyether polyol Q1 is one or more of ethylene oxide or propylene oxide, with a number average molecular weight of 3000-4000 g / mol and a functionality of 2-3. The polyester polyol P1 is prepared by esterification and condensation reaction of small molecule polyol and diacid, and its number average molecular weight is 1000-2500 g / mol and its functionality is 2-2.

06. The polyester polymer polyol P2 is prepared by polycondensation reaction of diol and adipic acid to obtain a polyester prepolymer with a number average molecular weight of 2000 g / mol, and then by graft copolymerization reaction with styrene, and its functionality is 2.

2. The strongly adhesive, highly moisture-permeable polyurethane microporous elastomer according to claim 1, characterized in that, The preparation method of the silane-modified polyether polyol S1 includes the following steps: mixing the dehydrated polyether polyol Q1 with a silane coupling agent, and reacting at 90-100℃ for 2-4 hours in the presence of a catalyst and an antioxidant, and obtaining the silane-modified polyether polyol S1 after monomer removal. The molar ratio of the polyether polyol Q1 to the silane coupling agent is 1:(1-1.5).

3. The strongly adhesive, highly moisture-permeable polyurethane microporous elastomer according to claim 1, characterized in that, The chain extender is one or more of ethylene glycol, diethylene glycol, or 1,4-butanediol; the crosslinking agent is one or more of diethanolamine, triethanolamine, or glycerol.

4. The strongly adhesive, highly moisture-permeable polyurethane microporous elastomer according to claim 1, characterized in that, The foaming agent is a polysiloxane-oxidized olefin block copolymer.

5. The strongly adhesive, highly moisture-permeable polyurethane microporous elastomer according to claim 1, characterized in that, The foaming agent is water; the catalyst is an amine catalyst.

6. The strongly adhesive, highly moisture-permeable polyurethane microporous elastomer according to claim 1, characterized in that, The isocyanate is one or more of 4,4'-diphenylmethane diisocyanate or carbodiimide-modified MDI.

7. The strongly adhesive, highly moisture-permeable polyurethane microporous elastomer according to claim 1, characterized in that, The total mass fraction of polyester polyol P1 and polyester polymer polyol P2 in component A is 100 parts.

8. The strongly adhesive, highly moisture-permeable polyurethane microporous elastomer according to claim 1, characterized in that, The -NCO content of component B is 22-28 wt.%.

9. A method for preparing a strongly adhesive, highly moisture-permeable polyurethane microporous elastomer according to any one of claims 1-8, characterized in that, Includes the following steps: 1) Add polyester polyol P1, polyester polymer polyol P2, silane-modified polyether polyol S1, chain extender, crosslinking agent, foam leveling agent, foaming agent and catalyst into a reaction vessel, stir at atmospheric pressure and 60-70℃ for 2-3 hours to obtain component A. 2) Add polyester polyol P1 and silane-modified polyether polyol S1 into a reactor, control the material temperature at 40-50℃, add isocyanate, and react at 70-80℃ for 1-3 hours to obtain component B. 3) Mix components A and B, then inject the mixture into a mold at a temperature of 40-50℃ and cure for 5-10 minutes to obtain a strongly adhesive, highly moisture-permeable polyurethane microporous elastomer.

10. An application of the strongly adhesive, highly moisture-permeable polyurethane microporous elastomer according to any one of claims 1-8, characterized in that, Used in the preparation of shoe soles.

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