A polyether polyurethane foam elastomer

Abstract

The present application discloses a polyether polyurethane foam elastomer, which relates to the technical field of foaming materials. The present application uses 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran to react to obtain a prepolymer, and then introduces an oxygen-containing heterocycle by reacting a chain extender with an oxygen-containing heterocycle with the isocyanate group in the prepolymer, thereby increasing the length and crosslinking density of the material molecular chain and enhancing the elasticity of the material. At the same time, the oxygen atoms on the oxygen-containing heterocycle, as well as the oxygen and nitrogen atoms in the group formed by the reaction of the chain extender and the isocyanate, can form hydrogen bonds, further enhancing the elasticity of the material. Finally, when the oxygen-containing heterocycle is introduced, CO 2 , achieving the effect of foaming, so that the apparent density of the foamed elastomer is reduced, eliminating the need for additional foaming agents. The polyether polyurethane foamed elastomer prepared in the present application has stronger elasticity, does not require additional foaming agents, and has broad application value in shock absorbers, cushioning materials, etc.

Description

Technical Field

[0001] The present application relates to the technical field of foaming materials, and in particular to a polyether polyurethane foaming elastomer. Background Art

[0002] Polyurethane elastomer is a special class of elastomers, and is a type of material that has both rubber and plastic properties. From the perspective of molecular structure, polyurethane elastomer is a block polymer, generally composed of a soft segment of a flexible long chain of oligomer polyols, and a hard segment of a diisocyanate and a chain extender. The hard and soft segments are arranged alternately to form a repeating structural unit. In addition to containing urethane groups, hydrogen bonds can be formed within and between polyurethane molecules, and the soft and hard segments can form microphase regions and produce microphase separation. These structural characteristics give polyurethane elastomers excellent wear resistance and toughness, and are known as "wear-resistant rubber".

[0003] Polyurethane foam elastomer is a polymer material obtained by foaming and curing in a mold through the action of physical foaming agent or chemical foaming agent on the basis of polyurethane elastomer. It is widely used in cushioning materials, impact absorbing materials, vibration absorbing materials, cushion materials, mattress materials, sound absorbing materials and other fields.

[0004] However, traditional polyurethane foam elastomers often need to rely on the use of physical foaming agents or chemical foaming agents for foaming, and due to structural limitations, the elasticity of traditional polyurethane foam elastomers still has a lot of room for improvement.

[0005] A Chinese patent with publication number CN 118240167A discloses a polyether polyurethane elastomer and a preparation method thereof, wherein the polyurethane elastomer is obtained by reacting an isocyanate reactive component (component A) with an isocyanate component (component B), wherein the raw materials of component A include polyether polyol, chain extender, catalyst, foaming agent, and wear-resistant agent. The polyurethane elastomer is introduced with three different polyether polyols to obtain a polyether polyurethane elastomer. However, the density of the polyether polyurethane elastomer still has room for improvement, oxygen-containing heterocycles are not introduced into the structure, and a foaming agent still needs to be added to the components. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present application provides a polyether polyurethane foam elastomer, which is prepared with a polyether polyurethane foam elastomer with higher elasticity and no need to add additional physical foaming agents or chemical foaming agents. It has broad application value in shock absorbers, cushioning materials, etc.

[0007] In order to achieve the above purpose, this application adopts the following technical solutions:

[0008] A polyether polyurethane foam elastomer is obtained by reacting a prepolymer having a cyclic structure and a chain extender having an oxygen-containing heterocyclic ring; the prepolymer having a cyclic structure is obtained by reacting 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran as raw materials; and the preparation method of the polyether polyurethane foam elastomer comprises:

[0009] Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran respectively and add them into the reaction kettle;

[0010] Then, the temperature is raised to 70-90°C under nitrogen protection, and then a catalyst is added to the reaction kettle, followed by stirring and reacting at this temperature for 2-4 hours to obtain a prepolymer;

[0011] Adding a chain extender having an oxygen-containing heterocyclic ring dispersed in a solvent to the prepolymer, and continuing to stir and react at a temperature of 70-90° C. for 12-18 hours;

[0012] Finally, the temperature is lowered to 40-50°C, and after being stirred evenly for 2 hours, the mixture is poured into a mold and vacuum dried. After demolding, a polyether polyurethane foamed elastomer is obtained.

[0013] Beneficial technical effects:

[0014] The present application uses 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran as raw materials to react to obtain a prepolymer, and then adds a chain extender having an oxygen-containing heterocycle to react with the isocyanate group in the prepolymer to further introduce the oxygen-containing heterocycle, thereby increasing the length and cross-linking density of the molecular chain, thereby enhancing the elasticity of the obtained polyether polyurethane foam elastomer.

[0015] The oxygen atoms on the oxygen-containing heterocyclic ring in the structure of the polyether polyurethane foam elastomer prepared in the present application, as well as the oxygen atoms and nitrogen atoms in the group formed after the reaction of the chain extender and isocyanate, can form hydrogen bonds, thereby further enhancing the elasticity of the prepared polyether polyurethane foam elastomer.

[0016] The polyether polyurethane foamed elastomer prepared in the present application can generate carbon dioxide gas while introducing oxygen-containing heterocycles to achieve a foaming effect, thereby reducing the apparent density of the foamed elastomer and eliminating the need for the use of an additional foaming agent.

[0017] The polyether polyurethane foamed elastomer prepared in the present application has excellent elasticity and saves the cost of using an additional foaming agent, and has broad application value in shock absorbers, cushioning materials, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the chemical structure formula of polyether polyurethane foam elastomer.

[0019] Figure 2It is a schematic diagram of the reaction process of a prepolymer having a ring structure and a chain extender having an oxygen-containing heterocycle to produce carbon dioxide gas.

[0020] Figure 3 is the chemical structural formula of the polyether polyurethane foamed elastomer prepared in Example 1.

[0021] Figure 4 It is a flow chart for preparing polyether polyurethane foam elastomer. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application is further described in detail below in conjunction with the embodiments. However, this should not be understood as the scope of the present application being limited to the following examples. Without departing from the above-mentioned method ideas of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] In this application, the terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit the application.

[0024] As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0025] The term "ring structure" refers to a closed ring structure formed by three or more atoms connected by chemical bonds. These rings can be composed entirely of carbon atoms, such as cycloalkanes and benzene rings, or they can contain other elements, such as oxygen and nitrogen, to form heterocyclic compounds.

[0026] The term "prepolymer" is also called prepolymer, which refers to the intermediate product generated by the preliminary polymerization reaction of the reactive monomers. This substance has a low molecular weight, usually between a few hundred and a few thousand. Its structure contains specific active end groups or side groups, which can be converted into high molecular weight polymers through further reactions.

[0027] The term "oxygen-containing heterocycle" in this application refers to a ring structure consisting of five or more atoms, which are connected by chemical bonds to form a closed ring. In such a closed ring, at least one atom is oxygen.

[0028] This application adopts the following technical solutions:

[0029] A polyether polyurethane foam elastomer is obtained by reacting a prepolymer having a cyclic structure and a chain extender having an oxygen-containing heterocyclic ring; the prepolymer having a cyclic structure is obtained by reacting 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran as raw materials; and the preparation method of the polyether polyurethane foam elastomer comprises:

[0030] Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran respectively and add them into the reaction kettle;

[0031] Then, the temperature is raised to 70-90°C under nitrogen protection, and then a catalyst is added to the reaction kettle, followed by stirring and reacting at this temperature for 2-4 hours to obtain a prepolymer;

[0032] Adding a chain extender having an oxygen-containing heterocyclic ring dispersed in a solvent to the prepolymer, and continuing to stir and react at a temperature of 70-90° C. for 12-18 hours;

[0033] Finally, the temperature is lowered to 40-50°C, and after being stirred evenly for 2 hours, the mixture is poured into a mold and vacuum dried. After demolding, a polyether polyurethane foamed elastomer is obtained.

[0034] In a possible implementation, the mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, catalyst, chain extender having an oxygen-containing heterocycle, and solvent is (25-35): (25-35): (3-8): (15-30): (20-30).

[0035] In a possible implementation, the chain extender having an oxygen-containing heterocycle includes one or more of 3,4-furandicarboxylic acid, 2-methylfuran-3,4-dicarboxylic acid, 2,5-dimethylfuran-3,4-dicarboxylic acid, 2-phenylfuran-3,4-dicarboxylic acid, 2-(4-methoxyphenyl)-3,4-furandicarboxylic acid, 2,5-diphenylfuran-3,4-dicarboxylic acid, and [2,2'-bifuran]-5,5'-dicarboxylic acid.

[0036] In a possible implementation, the catalyst includes one or more of dibutyltin dilaurate, stannous octoate, bismuth isooctanoate, bismuth neodecanoate, bismuth 2-ethylhexanoate, and zinc naphthenate.

[0037] In a possible implementation, the solvent for dispersing the chain extender having an oxygen-containing heterocyclic ring includes any one of dimethyl sulfoxide and N,N-dimethylformamide.

[0038] In a possible implementation, the structure of the prepolymer having a cyclic structure includes:

[0039] ;

[0040] Where n represents the degree of polymerization of polytetrahydrofuran.

[0041] In a possible implementation, a prepolymer having a cyclic structure reacts with a chain extender having an oxygen-containing heterocyclic ring to form a polyether polyurethane foamed elastomer structure such as Figure 1 As shown, including:

[0042] .

[0043] Wherein n represents the degree of polymerization of polytetrahydrofuran; R includes one or more of the following structures:

[0044] , , , , , , , .

[0045] In a possible implementation, the process of generating carbon dioxide gas by reacting a prepolymer having a cyclic structure with a chain extender having an oxygen-containing heterocyclic ring is as follows: Figure 2 As shown, including:

[0046] ;

[0047] Wherein n represents the degree of polymerization of polytetrahydrofuran; R includes one or more of the following structures:

[0048] , , , , , , , .

[0049] The experimental raw materials used in this application come from the following sources:

[0050] 4,4-Dicyclohexylmethane diisocyanate: Beijing Bailingwei Technology Co., Ltd.;

[0051] Polytetrahydrofuran: Jiangsu Runfeng Synthetic Technology Co., Ltd.;

[0052] Catalyst: Jiangsu Runfeng Synthetic Technology Co., Ltd.;

[0053] Solvent: Jiangsu Runfeng Synthetic Technology Co., Ltd.;

[0054] Chain extender: Shanghai MacLean Biochemical Technology Co., Ltd.;

[0055] Propylene glycol: Jiangsu Runfeng Synthetic Technology Co., Ltd.;

[0056] 1,4-Butanediol: Jiangsu Runfeng Synthetic Technology Co., Ltd.;

[0057] 1,4-Cyclohexanediol: Jiangsu Runfeng Synthetic Technology Co., Ltd.

[0058] The following will specifically describe a polyether polyurethane foam elastomer provided by the present application in combination with different embodiments.

[0059] Example 1

[0060] like Figure 4 As shown, a method for preparing a polyether polyurethane foamed elastomer comprises the following steps:

[0061] 1. Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran and add them into the reaction kettle;

[0062] 2. Then, the temperature was raised to 80°C under nitrogen protection, and then dibutyltin dilaurate was added into the reaction kettle as a catalyst, and then stirred and reacted at this temperature for 3 hours to obtain a prepolymer;

[0063] 3. Then, 3,4-furandicarboxylic acid was dispersed in dimethyl sulfoxide and added to the prepolymer, and the reaction was continued at 80°C with stirring for 15 hours;

[0064] 4. Finally, the temperature is lowered to 45°C, stirred evenly for 2 hours, poured into a mold and vacuum dried, and the polyether polyurethane foamed elastomer is obtained after demoulding;

[0065] In steps 1 to 4, the mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, dibutyltin dilaurate, 3,4-furandicarboxylic acid, and dimethyl sulfoxide is 25:25:5:15:30.

[0066] The structure of the obtained polyether polyurethane foamed elastomer is as follows: Figure 3 shown.

[0067] Example 2

[0068] like Figure 4 As shown, a method for preparing a polyether polyurethane foamed elastomer comprises the following steps:

[0069] 1. Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran and add them into the reaction kettle;

[0070] 2. Then, the temperature was raised to 70°C under nitrogen protection, and then stannous octoate was added to the reactor as a catalyst, and then stirred and reacted at this temperature for 2 hours to obtain a prepolymer;

[0071] 3. Then disperse 2-methylfuran-3,4-dicarboxylic acid in N,N-dimethylformamide, add it to the prepolymer, and continue to stir and react at 90°C for 18 hours;

[0072] 4. Finally, the temperature is lowered to 50°C, stirred evenly for 2 hours, poured into a mold and vacuum dried, and the polyether polyurethane foamed elastomer is obtained after demoulding;

[0073] In steps 1 to 4, the mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, stannous octoate, 2-methylfuran-3,4-dicarboxylic acid, and N,N-dimethylformamide is 30:30:5:15:20.

[0074] Example 3

[0075] like Figure 4 As shown, a method for preparing a polyether polyurethane foamed elastomer comprises the following steps:

[0076] 1. Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran and add them into the reaction kettle;

[0077] 2. Then, the temperature was raised to 70° C. under nitrogen protection, and bismuth isooctanoate was added into the reactor as a catalyst, followed by stirring and reacting at this temperature for 4 hours to obtain a prepolymer;

[0078] 3. Then disperse 2,5-dimethylfuran-3,4-dicarboxylic acid in dimethyl sulfoxide and add it to the prepolymer, and continue to stir and react at 90°C for 18 hours;

[0079] 4. Finally, the temperature is lowered to 40°C, stirred evenly for 2 hours, poured into a mold and vacuum dried, and the polyether polyurethane foamed elastomer is obtained after demoulding;

[0080] In steps 1 to 4, the mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, bismuth isooctanoate, 2,5-dimethylfuran-3,4-dicarboxylic acid, and dimethyl sulfoxide is 35:25:5:15:20.

[0081] Example 4

[0082] like Figure 4 As shown, a method for preparing a polyether polyurethane foamed elastomer comprises the following steps:

[0083] 1. Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran and add them into the reaction kettle;

[0084] 2. Then, the temperature was raised to 90° C. under nitrogen protection, and bismuth neodecanoate was added into the reaction kettle as a catalyst, followed by stirring and reacting at this temperature for 2 hours to obtain a prepolymer;

[0085] 3. Then disperse 2-phenylfuran-3,4-dicarboxylic acid in N,N-dimethylformamide and add it to the prepolymer, and continue to stir and react at 70°C for 12 hours;

[0086] 4. Finally, the temperature is lowered to 50°C, stirred evenly for 2 hours, poured into a mold and vacuum dried, and the polyether polyurethane foamed elastomer is obtained after demoulding;

[0087] In steps 1 to 4, the mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, bismuth neodecanoate, 2-phenylfuran-3,4-dicarboxylic acid, and N,N-dimethylformamide is 25:30:5:20:20.

[0088] Example 5

[0089] like Figure 4 As shown, a method for preparing a polyether polyurethane foamed elastomer comprises the following steps:

[0090] 1. Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran and add them into the reaction kettle;

[0091] 2. Then, the temperature was raised to 80° C. under nitrogen protection, and then 2-ethylhexanoic acid bismuth was added into the reaction kettle as a catalyst, and then stirred and reacted at this temperature for 3 hours to obtain a prepolymer;

[0092] 3. Then disperse 2-(4-methoxyphenyl)-3,4-furandicarboxylic acid in dimethyl sulfoxide and add it to the prepolymer, and continue to stir and react at 70°C for 18 hours;

[0093] 4. Finally, the temperature is lowered to 45°C, stirred evenly for 2 hours, poured into a mold and vacuum dried, and the polyether polyurethane foamed elastomer is obtained after demoulding;

[0094] In steps 1 to 4, the mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, bismuth 2-ethylhexanoate, 2-(4-methoxyphenyl)-3,4-furandicarboxylic acid, and dimethyl sulfoxide is 30:25:3:17:25.

[0095] Example 6

[0096] like Figure 4 As shown, a method for preparing a polyether polyurethane foamed elastomer comprises the following steps:

[0097] 1. Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran, mix and add into the reaction kettle;

[0098] 2. Then, the temperature was raised to 70°C under nitrogen protection, and then zinc cyclohexaneate was added into the reactor as a catalyst, and then stirred and reacted at this temperature for 4 hours to obtain a prepolymer;

[0099] 3. Then disperse [2,2'-bifuran]-5,5'-dicarboxylic acid in N,N-dimethylformamide and add it to the prepolymer, and continue to stir and react at 90°C for 18 hours;

[0100] 4. Finally, the temperature is lowered to 50°C, stirred evenly for 2 hours, poured into a mold and vacuum dried, and the polyether polyurethane foamed elastomer is obtained after demoulding;

[0101] In steps 1 to 4, the mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, zinc cyclohexaneate, [2,2'-bifuran]-5,5'-dicarboxylic acid, and N,N-dimethylformamide is 25:25:8:17:25.

[0102] Comparative Example 1:

[0103] A method for preparing a polyether polyurethane foamed elastomer comprises the following steps:

[0104] 1. Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran and add them into the reaction kettle;

[0105] 2. Then, the temperature was raised to 80°C under nitrogen protection, and then dibutyltin dilaurate was added into the reaction kettle as a catalyst, and then stirred and reacted at this temperature for 3 hours to obtain a prepolymer;

[0106] 3. Then disperse propylene glycol in dimethyl sulfoxide and add it to the prepolymer, and continue to stir and react at 80°C for 15 hours;

[0107] 4. Finally, the temperature is lowered to 45°C, stirred evenly for 2 hours, poured into a mold and vacuum dried, and the polyether polyurethane foamed elastomer is obtained after demoulding;

[0108] In steps 1 to 4, the mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, dibutyltin dilaurate, propylene glycol, and dimethyl sulfoxide is 25:25:5:15:30.

[0109] Comparative Example 2:

[0110] A method for preparing a polyether polyurethane foamed elastomer comprises the following steps:

[0111] 1. Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran and add them into the reaction kettle;

[0112] 2. Then, the temperature was raised to 80° C. under nitrogen protection, and bismuth isooctanoate was added into the reactor as a catalyst, and then the reaction was stirred at this temperature for 3 hours to obtain a prepolymer;

[0113] 3. Then disperse 1,4-butanediol in dimethyl sulfoxide and add it to the prepolymer, and continue to stir and react at 80°C for 15 hours;

[0114] 4. Finally, the temperature is lowered to 45°C, stirred evenly for 2 hours, poured into a mold and vacuum dried, and the polyether polyurethane foamed elastomer is obtained after demoulding;

[0115] In steps 1 to 4, the mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, bismuth isooctanoate, 1,4-butanediol, and dimethyl sulfoxide is 35:25:5:15:20.

[0116] Comparative Example 3:

[0117] A method for preparing a polyether polyurethane foamed elastomer comprises the following steps:

[0118] 1. Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran and add them into the reaction kettle;

[0119] 2. Then, the temperature was raised to 80°C under nitrogen protection, and then zinc cyclohexaneate was added into the reactor as a catalyst, and then stirred and reacted at this temperature for 3 hours to obtain a prepolymer;

[0120] 3. Then disperse 1,4-cyclohexanediol in N,N-dimethylformamide and add it to the prepolymer, and continue to stir and react at 80°C for 15 hours;

[0121] 4. Finally, the temperature is lowered to 45°C, stirred evenly for 2 hours, poured into a mold and vacuum dried, and the polyether polyurethane foamed elastomer is obtained after demoulding;

[0122] In steps 1 to 4, the mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, zinc cyclohexaneate, 1,4-cyclohexanediol, and N,N-dimethylformamide is 25:25:8:17:25.

[0123] With reference to GBT 6670-2008, a falling ball rebound test instrument was used to test the rebound rate of the polyether polyurethane foam elastomer.

[0124] Refer to GBT 6343-2009 to test the apparent density of polyether polyurethane foam elastomer.

[0125] Table 1 Performance test results of polyether polyurethane foamed elastomers prepared in Examples 1-6 and Comparative Examples 1-3

[0126] Rebound rate (%) <![CDATA[Apparent density (kg / m 3 ).]]> Example 1 79 261 Example 2 77 263 Example 3 79 262 Example 4 75 268 Example 5 74 267 Example 6 75 269 Comparative Example 1 65 282 Comparative Example 2 62 291 Comparative Example 3 61 297

[0127] As shown in Table 1, the rebound rate of Examples 1-6 is higher than that of Comparative Examples 1-3, and the apparent density is lower than that of Comparative Examples 1-3. This is because the polyether polyurethane foamed elastomer prepared by the present application introduces oxygen-containing heterocycles, thereby increasing the length of the molecular chain and the crosslinking density, and enhancing the elasticity of the material. At the same time, the oxygen atoms on the oxygen-containing heterocycles, as well as the oxygen atoms and nitrogen atoms in the groups formed after the reaction of the chain extender and the isocyanate, can form hydrogen bonds, further enhancing the elasticity of the material. Finally, while introducing the oxygen-containing heterocycles, carbon dioxide gas can be generated to achieve the effect of foaming, so that the apparent density of the foamed elastomer is reduced. Comparative Examples 1-3 neither introduce oxygen-containing heterocycles nor produce carbon dioxide gas while introducing oxygen-containing heterocycles, so the effect of foaming is not achieved, so its rebound rate is low and the apparent density is high.

[0128] The above results show and describe the basic principles and main features of the present application as well as the advantages of the present application.

[0129] Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection sought in the present application is defined by the equivalents of the attached claims.

Claims

1. A polyether polyurethane foamed elastomer, characterized in that: The polyether polyurethane foamed elastomer is obtained by reacting a prepolymer having a cyclic structure and a chain extender having an oxygen-containing heterocyclic ring; the prepolymer having a cyclic structure is obtained by reacting 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran as raw materials; the preparation method of the polyether polyurethane foamed elastomer comprises: Weigh 4,4-diisocyanate dicyclohexylmethane and polytetrahydrofuran respectively and add them into the reaction kettle; Then, the temperature is raised to 70-90°C under nitrogen protection, and then a catalyst is added to the reaction kettle, followed by stirring and reacting at this temperature for 2-4 hours to obtain a prepolymer; Adding a chain extender having an oxygen-containing heterocyclic ring dispersed in a solvent to the prepolymer, and continuing to stir and react at a temperature of 70-90° C. for 12-18 hours; Finally, the temperature is lowered to 40-50°C, stirred evenly for 2 hours, poured into a mold and vacuum dried, and a polyether polyurethane foamed elastomer is obtained after demoulding; The mass ratio of the 4,4-diisocyanate dicyclohexylmethane, polytetrahydrofuran, catalyst, chain extender having an oxygen-containing heterocycle, and solvent is (25-35): (25-35): (3-8): (15-30): (20-30); The chain extender having an oxygen-containing heterocyclic ring includes one or more of 3,4-furandicarboxylic acid, 2-methylfuran-3,4-dicarboxylic acid, 2,5-dimethylfuran-3,4-dicarboxylic acid, 2,5-diformylfuran-3,4-dicarboxylic acid, 2-phenylfuran-3,4-dicarboxylic acid, 2-(4-methoxyphenyl)-3,4-furandicarboxylic acid, 2,5-diphenylfuran-3,4-dicarboxylic acid, and [2,2'-bifuran]-5,5'-dicarboxylic acid.

2. A polyether polyurethane foamed elastomer according to claim 1, characterized in that: The catalyst includes one or more of dibutyltin dilaurate, stannous octoate, bismuth isooctanoate, bismuth neodecanoate, bismuth 2-ethylhexanoate, and zinc naphthenate.

3. A polyether polyurethane foamed elastomer according to claim 1, characterized in that: The solvent for dispersing the chain extender having an oxygen-containing heterocyclic ring includes any one of dimethyl sulfoxide and N,N-dimethylformamide.

4. A polyether polyurethane foamed elastomer according to claim 1, characterized in that: The structure of the prepolymer having a cyclic structure comprises: ； Where n represents the degree of polymerization of polytetrahydrofuran.

5. The polyether polyurethane foamed elastomer according to claim 1, characterized in that: The prepolymer having a cyclic structure reacts with a chain extender having an oxygen-containing heterocyclic ring to form a polyether polyurethane foaming elastomer structure comprising: ； Wherein n represents the degree of polymerization of polytetrahydrofuran; R includes one or more of the following structures: 、 、 、 、 、 、 、 。 6. The polyether polyurethane foamed elastomer according to claim 1, characterized in that: The process of obtaining a polyether polyurethane foamed elastomer by reacting the prepolymer having a cyclic structure with a chain extender having an oxygen-containing heterocyclic ring comprises: ； Wherein n represents the degree of polymerization of polytetrahydrofuran; R includes one or more of the following structures: 、 、 、 、 、 、 、 。

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