Anti-aging polyurethane sponge and preparation method thereof

Abstract

The invention discloses an anti-aging polyurethane sponge and a preparation method thereof, and belongs to the technical field of polyurethane preparation, adamantane modified graphene oxide is introduced in the preparation process of polyurethane to form a block copolymer, and the anti-aging performance and the mechanical performance of the material are improved; by introducing the ureido-modified polyethylene derivative, the water resistance, ultraviolet resistance and impact resistance of the polyurethane sponge are improved; the anti-aging polyurethane sponge prepared by the preparation method disclosed by the invention is excellent in anti-aging performance and excellent in mechanical property, and the service life of the polyurethane sponge is effectively prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane preparation, and in particular is an anti-aging polyurethane sponge and a preparation method thereof. Background Art

[0002] Polyurethane sponge is a porous polyurethane material composed of a large number of micropores and polyurethane resin pore wall meridians. It has high strength, rigidity and hardness, and has good adhesion, water resistance, alkali resistance and acid resistance. It can be processed into high-density sponge, flame-retardant sponge, fire-proof sponge, high-resilience sponge, etc.

[0003] However, polyurethane sponge has poor heat aging resistance. Long-term use will cause the sponge to come into contact with nitrogen oxides in the air, causing the sponge surface to turn yellow and age. The strength and toughness of the sponge will decrease, causing the sponge to become brittle and fall into pieces with a slight squeeze, thus affecting the use of the polyurethane sponge. Therefore, how to improve the anti-aging performance of polyurethane sponge is of great significance to extending the service life of polyurethane sponge and improving the performance of polyurethane sponge. Summary of the invention

[0004] To solve the above problems, the present invention aims to provide an anti-aging polyurethane sponge and a preparation method thereof.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: An anti-aging polyurethane sponge is composed of the following raw materials, measured in parts by weight: 50-80 parts of polyether polyol, 15-40 parts of diisocyanate, 10-15 parts of adamantane-modified graphene oxide, 5-10 parts of modified polyethylene derivatives, 4-8 parts of water, 1-2 parts of silicone oil and 1.5-2.5 parts of a catalyst; The modified polyethylene derivative is a polyethylene derivative with a urea group modified on the side chain.

[0006] The catalyst is dibutyltin dilaurate, tetramethylethylenediamine or triethylenediamine.

[0007] The diisocyanate is isophorone diisocyanate, hexamethylene diisocyanate or toluene diisocyanate.

[0008] The adamantane-modified graphene oxide is prepared according to the following method: Tricyclo[3,3,1,13,7]decane-1-amine and graphene oxide are added to an organic solvent, stirred and dissolved, and then diethyl azodicarboxylate and 1-hydroxybenzotriazole are added. The mixture is reacted at 25-40°C for 5-12 hours. After the reaction is completed, the solvent is removed by distillation under reduced pressure. The residue is washed with acetone for 3-5 times and dried to obtain adamantane-modified graphene oxide.

[0009] The organic solvent is dimethylformamide or dimethyl sulfoxide.

[0010] The mass ratio of the tricyclo[3,3,1,13,7]decane-1-amine, graphene oxide, organic solvent, diethyl azodicarboxylate and 1-hydroxybenzotriazole is 0.15-0.25:1:5-10:0.2-0.25:0.15-0.2.

[0011] The preparation method of the polyethylene derivative comprises the following steps: 1) Add 1,3-bis(hydroxymethyl)urea, propylene bromide and sodium hydride to tetrahydrofuran, stir and dissolve, heat to 50-70°C and react for 5-10 hours. After the reaction is completed, add water to the reaction solution to quench the reaction, then add dichloromethane for extraction, and distill the obtained organic layer under reduced pressure to remove the solvent to obtain terminal alkenyl urea: 2) Add the terminal olefin urea prepared in step 1) to a mixed solvent of methanol and n-hexane in a volume ratio of 1:8, add a Ziegler-Natta catalyst thereto, stir to dissolve, introduce ethylene into the solution, react at 0.5-1 MPa and 50-100° C. for 3-5 hours, filter, and wash the obtained filter cake with acetone to obtain a polyethylene derivative.

[0012] The mass ratio of 1,3-bis(hydroxymethyl)urea, propylene bromide, sodium hydride, tetrahydrofuran, water and dichloromethane in step 1) is 1:1-1.5:0.2-0.25:5-10:3-5:5-10.

[0013] The mass ratio of the terminal olefin urea, the mixed solvent, the Ziegler-Natta catalyst and the ethylene in step 2) is 1:10-15:0.05-0.1:1-5.

[0014] The method for preparing the anti-aging polyurethane sponge comprises the following steps: In parts by weight, 50-80 parts of polyether polyol, 10-15 parts of adamantane-modified graphene oxide, 4-8 parts of water, 1-2 parts of silicone oil and 1.5-2.5 parts of a catalyst are added into a reactor and stirred and mixed evenly; then 15-40 parts of diisocyanate and 5-10 parts of a modified polyethylene derivative are added thereto, stirred and mixed for 20-30 minutes, then poured into a mold, aged and dried to obtain an anti-aging polyurethane sponge.

[0015] Compared with the prior art, the present invention has the following advantages: The anti-aging polyurethane sponge of the present invention introduces adamantane-modified graphene oxide in the preparation process of polyurethane to form a block copolymer. The introduction of adamantane can improve the light resistance, oxidation resistance and thermal stability of the polyurethane sponge, thereby improving the anti-aging performance of the material; graphene has good resistance to oxidation and thermal degradation, can delay the aging process of the polyurethane sponge, and the introduction of adamantane-modified graphene oxide can significantly enhance the mechanical properties of the polyurethane sponge.

[0016] The anti-aging polyurethane sponge of the present invention introduces a polyethylene derivative modified with a urea group, wherein the polyethylene has good chemical resistance, weather resistance and mechanical properties, and can improve the water resistance, UV resistance and impact resistance of the polyurethane sponge; the introduction of the urea group can enable the urea groups on the polyethylene and the polyurethane to form hydrogen bonds, thereby improving the interface strength and stability between the polymers and effectively extending the service life of the polyurethane sponge. DETAILED DESCRIPTION

[0017] In order to better understand the technical solution of the present invention, the above content of the present invention is further described in detail below through specific implementation methods in the form of embodiments, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples. All technologies realized based on the above content of the present invention belong to the scope of the present invention.

[0018] Example 1 Preparation of adamantane-modified graphene oxide: 0.15 kg of tricyclo[3,3,1,13,7]decane-1-amine and 1 kg of graphene oxide were added to 5 kg of dimethylformamide, stirred and dissolved, and then 0.2 kg of diethyl azodicarboxylate and 0.15 kg of 1-hydroxybenzotriazole were added. The mixture was reacted at 25°C for 12 h. After the reaction was completed, the solvent was removed by distillation under reduced pressure. The residue was washed with acetone three times and dried to obtain adamantane-modified graphene oxide.

[0019] Preparation of polyethylene derivatives: 0.1 kg of 1,3-bis(hydroxymethyl)urea, 0.1 kg of propylene bromide and 0.02 kg of sodium hydride were added to 0.5 kg of tetrahydrofuran, stirred and dissolved, and heated to 50°C for reaction for 10 hours. After the reaction was completed, 0.3 kg of water was added to the reaction solution to quench the reaction, and 0.5 kg of dichloromethane was added for extraction. The obtained organic layer was distilled under reduced pressure to remove the solvent to obtain terminal alkenyl urea: 0.1 kg of terminal olefin urea was added to 1 kg of a mixed solvent of methanol and n-hexane in a volume ratio of 1:8, and then 0.005 kg of a Ziegler-Natta catalyst was added thereto. After stirring and dissolving, 0.1 kg of ethylene was introduced into the solution. After reacting at 0.5 MPa and 100°C for 3 hours, the solution was filtered and the filter cake was washed with acetone to obtain a polyethylene derivative.

[0020] Preparation of anti-aging polyurethane sponge: 5 kg of polyether polyol, 1 kg of adamantane-modified graphene oxide, 0.4 kg of water, 0.1 kg of silicone oil and 0.15 kg of dibutyltin dilaurate were added into a reactor and stirred to mix evenly; 1.5 kg of isophorone diisocyanate and 0.5 kg of modified polyethylene derivative were added thereto, stirred and mixed for 20 minutes, then poured into a mold, aged and dried to obtain an anti-aging polyurethane sponge.

[0021] Example 2 Preparation of adamantane-modified graphene oxide: 0.18 kg of tricyclo[3,3,1,13,7]decane-1-amine and 1 kg of graphene oxide were added to 6 kg of dimethyl sulfoxide, stirred and dissolved, and then 0.21 kg of diethyl azodicarboxylate and 0.16 kg of 1-hydroxybenzotriazole were added. The mixture was reacted at 30°C for 10 h. After the reaction was completed, the solvent was removed by distillation under reduced pressure. The residue was washed with acetone for 4 times and dried to obtain adamantane-modified graphene oxide.

[0022] Preparation of polyethylene derivatives: 0.1 kg of 1,3-bis(hydroxymethyl)urea, 0.11 kg of allyl bromide and 0.022 kg of sodium hydride were added to 0.65 kg of tetrahydrofuran, stirred and dissolved, and heated to 55°C for reaction for 9 hours. After the reaction was completed, 0.35 kg of water was added to the reaction solution to quench the reaction, and 0.6 kg of dichloromethane was added for extraction. The obtained organic layer was distilled under reduced pressure to remove the solvent to obtain terminal alkenyl urea: 0.1 kg of terminal olefin urea was added to 1.1 kg of a mixed solvent of methanol and n-hexane in a volume ratio of 1:8, and then 0.006 kg of a Ziegler-Natta catalyst was added thereto. After stirring and dissolving, 0.2 kg of ethylene was introduced into the solution. After reacting at 0.6 MPa and 60°C for 4.5 hours, the solution was filtered and the filter cake was washed with acetone to obtain a polyethylene derivative.

[0023] Preparation of anti-aging polyurethane sponge: 5.5 kg of polyether polyol, 1.1 kg of adamantane-modified graphene oxide, 0.5 kg of water, 0.12 kg of silicone oil and 0.18 kg of tetramethylethylenediamine were added into a reactor and stirred to mix evenly; 2 kg of hexamethylene diisocyanate and 0.6 kg of modified polyethylene derivative were added thereto, stirred and mixed for 25 minutes, then poured into a mold, aged and dried to obtain an anti-aging polyurethane sponge.

[0024] Example 3 Preparation of adamantane-modified graphene oxide: 0.21 kg of tricyclo[3,3,1,13,7]decane-1-amine and 1 kg of graphene oxide were added to 7.5 kg of dimethyl sulfoxide, stirred and dissolved, and then 0.23 kg of diethyl azodicarboxylate and 0.18 kg of 1-hydroxybenzotriazole were added. The mixture was reacted at 35°C for 8 h. After the reaction was completed, the solvent was removed by distillation under reduced pressure. The residue was washed with acetone for 5 times and dried to obtain adamantane-modified graphene oxide.

[0025] Preparation of polyethylene derivatives: 0.1 kg of 1,3-bis(hydroxymethyl)urea, 0.13 kg of allyl bromide and 0.023 kg of sodium hydride were added to 0.75 kg of tetrahydrofuran, stirred and dissolved, and heated to 60°C for reaction for 8 hours. After the reaction was completed, 0.4 kg of water was added to the reaction solution to quench the reaction, and 0.75 kg of dichloromethane was added for extraction. The obtained organic layer was distilled under reduced pressure to remove the solvent to obtain terminal alkenyl urea: 0.1 kg of terminal olefin urea was added to 1.3 kg of a mixed solvent of methanol and n-hexane in a volume ratio of 1:8, and then 0.008 kg of a Ziegler-Natta catalyst was added thereto. After stirring and dissolving, 0.3 kg of ethylene was introduced into the solution. After reacting at 0.8 MPa and 80°C for 4 hours, the solution was filtered and the filter cake was washed with acetone to obtain a polyethylene derivative.

[0026] Preparation of anti-aging polyurethane sponge: 7 kg of polyether polyol, 1.3 kg of adamantane-modified graphene oxide, 0.6 kg of water, 0.15 kg of silicone oil and 0.2 kg of dibutyltin dilaurate were added into a reactor and stirred to mix evenly; 2.5 kg of isophorone diisocyanate and 0.8 kg of modified polyethylene derivative were added thereto, stirred and mixed for 25 minutes, then poured into a mold, aged and dried to obtain an anti-aging polyurethane sponge.

[0027] Example 4 Preparation of adamantane-modified graphene oxide: 0.23 kg of tricyclo[3,3,1,13,7]decane-1-amine and 1 kg of graphene oxide were added to 9 kg of dimethyl sulfoxide, stirred and dissolved, and then 0.24 kg of diethyl azodicarboxylate and 0.19 kg of 1-hydroxybenzotriazole were added. The mixture was reacted at 38°C for 7 h. After the reaction was completed, the solvent was removed by distillation under reduced pressure. The residue was washed with acetone for 5 times and dried to obtain adamantane-modified graphene oxide.

[0028] Preparation of polyethylene derivatives: 0.1 kg 1,3-bis(hydroxymethyl)urea, 0.14 kg propylene bromide and 0.024 kg sodium hydride were added to 0.9 kg tetrahydrofuran, stirred and dissolved, and heated to 65°C for 6 hours. After the reaction was completed, 0.45 kg water was added to the reaction solution to quench the reaction, and 0.9 kg dichloromethane was added for extraction. The obtained organic layer was distilled under reduced pressure to remove the solvent to obtain terminal alkenyl urea: 0.1 kg of terminal olefin urea was added to 1.4 kg of a mixed solvent of methanol and n-hexane in a volume ratio of 1:8, and then 0.009 kg of a Ziegler-Natta catalyst was added thereto. After stirring and dissolving, 0.4 kg of ethylene was introduced into the solution. After reacting at 0.9 MPa and 90°C for 3.5 hours, the solution was filtered and the filter cake was washed with acetone to obtain a polyethylene derivative.

[0029] Preparation of anti-aging polyurethane sponge: 7.5 kg of polyether polyol, 1.4 kg of adamantane-modified graphene oxide, 0.7 kg of water, 0.18 kg of silicone oil and 0.23 kg of triethylenediamine were added into a reactor and stirred to mix evenly; 3 kg of toluene diisocyanate and 0.9 kg of modified polyethylene derivative were then added thereto, stirred and mixed for 25 minutes, then poured into a mold, aged and dried to obtain an anti-aging polyurethane sponge.

[0030] Example 5 Preparation of adamantane-modified graphene oxide: 0.25 kg of tricyclo[3,3,1,13,7]decane-1-amine and 1 kg of graphene oxide were added to 10 kg of dimethylformamide, stirred and dissolved, and then 0.25 kg of diethyl azodicarboxylate and 0.2 kg of 1-hydroxybenzotriazole were added. The mixture was reacted at 40°C for 5 h. After the reaction was completed, the solvent was removed by distillation under reduced pressure. The residue was washed with acetone for 5 times and dried to obtain adamantane-modified graphene oxide.

[0031] Preparation of polyethylene derivatives: 0.1 kg of 1,3-bis(hydroxymethyl)urea, 0.15 kg of allyl bromide and 0.025 kg of sodium hydride were added to 1 kg of tetrahydrofuran, stirred and dissolved, and heated to 70°C for reaction for 5 hours. After the reaction was completed, 0.5 kg of water was added to the reaction solution to quench the reaction, and 1 kg of dichloromethane was added for extraction. The obtained organic layer was distilled under reduced pressure to remove the solvent to obtain terminal alkenyl urea: 0.1 kg of terminal olefin urea was added to 1.5 kg of a mixed solvent of methanol and n-hexane in a volume ratio of 1:8, and then 0.01 kg of a Ziegler-Natta catalyst was added thereto. After stirring and dissolving, 0.5 kg of ethylene was introduced into the solution. After reacting at 1 MPa and 50°C for 5 hours, the solution was filtered and the filter cake was washed with acetone to obtain a polyethylene derivative.

[0032] Preparation of anti-aging polyurethane sponge: 8 kg of polyether polyol, 1.5 kg of adamantane-modified graphene oxide, 0.8 kg of water, 0.2 kg of silicone oil and 0.25 kg of triethylenediamine were added into a reactor and stirred to mix evenly; 4 kg of toluene diisocyanate and 1 kg of modified polyethylene derivative were then added thereto, stirred and mixed for 30 minutes, and then poured into a mold, aged and dried to obtain an anti-aging polyurethane sponge.

[0033] Example 6 Preparation of adamantane-modified graphene oxide: 0.2 kg of tricyclo[3,3,1,13,7]decane-1-amine and 1 kg of graphene oxide were added to 8 kg of dimethylformamide, stirred and dissolved, and then 0.25 kg of diethyl azodicarboxylate and 0.15 kg of 1-hydroxybenzotriazole were added. The mixture was reacted at 40 °C for 12 h. After the reaction was completed, the solvent was removed by distillation under reduced pressure. The residue was washed with acetone for 4 times and dried to obtain adamantane-modified graphene oxide.

[0034] Preparation of polyethylene derivatives: 0.1 kg of 1,3-bis(hydroxymethyl)urea, 0.12 kg of allyl bromide and 0.025 kg of sodium hydride were added to 0.8 kg of tetrahydrofuran, stirred and dissolved, and heated to 70°C for reaction for 10 hours. After the reaction was completed, 0.3 kg of water was added to the reaction solution to quench the reaction, and 1 kg of dichloromethane was added for extraction. The obtained organic layer was distilled under reduced pressure to remove the solvent to obtain terminal alkenyl urea: 0.1 kg of terminal olefin urea was added to 1.3 kg of a mixed solvent of methanol and n-hexane in a volume ratio of 1:8, and then 0.01 kg of a Ziegler-Natta catalyst was added thereto. After stirring to dissolve, 0.1 kg of ethylene was introduced into the solution. After reacting at 100°C for 5 hours under 1 MPa, the solution was filtered and the filter cake was washed with acetone to obtain a polyethylene derivative.

[0035] Preparation of anti-aging polyurethane sponge: 5 kg of polyether polyol, 1.5 kg of adamantane-modified graphene oxide, 0.6 kg of water, 0.15 kg of silicone oil and 0.2 kg of dibutyltin dilaurate were added into a reactor and stirred to mix evenly; 3 kg of toluene diisocyanate and 1 kg of modified polyethylene derivative were added thereto, stirred and mixed for 25 minutes, then poured into a mold, aged and dried to obtain an anti-aging polyurethane sponge.

[0036] Comparative Example 1 7 kg of polyether polyol, 1.3 kg of adamantane-modified graphene oxide, 0.6 kg of water, 0.15 kg of silicone oil and 0.2 kg of dibutyltin dilaurate were added into a reactor and stirred to mix evenly; 2.5 kg of isophorone diisocyanate was then added thereto, stirred and mixed for 25 minutes, then poured into a mold, aged and dried to obtain a polyurethane sponge.

[0037] The adamantane-modified graphene oxide was prepared according to the method in Example 3.

[0038] Comparative Example 2: 8 kg of polyether polyol, 0.6 kg of water, 0.15 kg of silicone oil and 0.2 kg of dibutyltin dilaurate were added into a reactor and stirred to mix evenly; 2.5 kg of isophorone diisocyanate and 0.8 kg of modified polyethylene derivative were added thereto, stirred and mixed for 25 minutes, then poured into a mold, aged and dried to obtain a polyurethane sponge.

[0039] The modified polyethylene derivative was prepared according to the method in Example 3.

[0040] Comparative Example 3 8 kg of polyether polyol, 0.6 kg of water, 0.15 kg of silicone oil and 0.2 kg of dibutyltin dilaurate were added into a reactor and stirred to mix evenly; 2.5 kg of isophorone diisocyanate was then added thereto, stirred and mixed for 25 minutes, and then poured into a mold, aged and dried to obtain an anti-aging polyurethane sponge.

[0041] The polyurethane sponges prepared in Examples 1 to 6 and Comparative Examples 1 to 3 were respectively subjected to performance tests, wherein the aging resistance test method was a light aging test, and the specific test process was as follows: the sample was placed in a xenon lamp accelerated aging test box, the experimental atmosphere was air, the temperature was 65° C., the accelerated aging time was 14 days, and the tensile strength was tested again after 14 days, and the performance degradation rate was calculated, the performance degradation rate = (1-tensile strength after aging / initial tensile strength) ×%. The test results are shown in Table 1.

[0042] Table 1 Polyurethane sponge performance test results

[0043] It can be seen from the results in Table 1 that the anti-aging polyurethane sponge prepared by the present invention has excellent mechanical properties and anti-aging properties. By comparison, Comparative Example 1 has a lower performance degradation rate than Comparative Example 2 because of the introduction of adamantane-modified graphene oxide; Comparative Example 2 has better mechanical properties than Comparative Example 1 because of the introduction of urea-modified polyethylene derivatives.

[0044] Although the above describes the specific implementation methods of the present invention, it does not limit the scope of protection of the present invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. An anti-aging polyurethane sponge, characterized in that: The invention is composed of the following raw materials in parts by weight: 50-80 parts of polyether polyol, 15-40 parts of diisocyanate, 10-15 parts of adamantane-modified graphene oxide, 5-10 parts of modified polyethylene derivative, 4-8 parts of water, 1-2 parts of silicone oil and 1.5-2.5 parts of catalyst; The modified polyethylene derivative is a polyethylene derivative with a urea group modified on the side chain.

2. The anti-aging polyurethane sponge according to claim 1, characterized in that: The catalyst is dibutyltin dilaurate, tetramethylethylenediamine or triethylenediamine.

3. The anti-aging polyurethane sponge according to claim 1, characterized in that: The diisocyanate is isophorone diisocyanate, hexamethylene diisocyanate or toluene diisocyanate.

4. The anti-aging polyurethane sponge according to claim 1, characterized in that: The adamantane-modified graphene oxide is prepared according to the following method: Tricyclo[3,3,1,13,7]decane-1-amine and graphene oxide are added to an organic solvent, stirred and dissolved, and then diethyl azodicarboxylate and 1-hydroxybenzotriazole are added. The mixture is reacted at 25-40°C for 5-12 hours. After the reaction is completed, the solvent is removed by distillation under reduced pressure. The residue is washed with acetone for 3-5 times and dried to obtain adamantane-modified graphene oxide.

5. The anti-aging polyurethane sponge according to claim 4, characterized in that: The organic solvent is dimethylformamide or dimethyl sulfoxide.

6. The anti-aging polyurethane sponge according to claim 4, characterized in that: The mass ratio of the tricyclo[3,3,1,13,7]decane-1-amine, graphene oxide, organic solvent, diethyl azodicarboxylate and 1-hydroxybenzotriazole is 0.15-0.25:1:5-10:0.2-0.25:0.15-0.

2.

7. The anti-aging polyurethane sponge according to claim 1, characterized in that: The preparation method of the polyethylene derivative comprises the following steps: 1) Add 1,3-bis(hydroxymethyl)urea, propylene bromide and sodium hydride to tetrahydrofuran, stir and dissolve, heat to 50-70°C and react for 5-10 hours. After the reaction is completed, add water to the reaction solution to quench the reaction, then add dichloromethane for extraction, and distill the obtained organic layer under reduced pressure to remove the solvent to obtain terminal alkenyl urea: 2) Add the terminal olefin urea prepared in step 1) to a mixed solvent of methanol and n-hexane in a volume ratio of 1:8, add a Ziegler-Natta catalyst thereto, stir to dissolve, introduce ethylene into the solution, react at 0.5-1 MPa and 50-100° C. for 3-5 hours, filter, and wash the obtained filter cake with acetone to obtain a polyethylene derivative.

8. The anti-aging polyurethane sponge according to claim 7, characterized in that: The mass ratio of 1,3-bis(hydroxymethyl)urea, propylene bromide, sodium hydride, tetrahydrofuran, water and dichloromethane in step 1) is 1:1-1.5:0.2-0.25:5-10:3-5:5-10.

9. The anti-aging polyurethane sponge according to claim 7, characterized in that: The mass ratio of the terminal olefin urea, the mixed solvent, the Ziegler-Natta catalyst and the ethylene in step 2) is 1:10-15:0.05-0.1:1-5.

10. The method for preparing the anti-aging polyurethane sponge according to claim 1, characterized in that: The following steps are involved: In parts by weight, 50-80 parts of polyether polyol, 10-15 parts of adamantane-modified graphene oxide, 4-8 parts of water, 1-2 parts of silicone oil and 1.5-2.5 parts of a catalyst are added into a reactor and stirred and mixed evenly; then 15-40 parts of diisocyanate and 5-10 parts of a modified polyethylene derivative are added thereto, stirred and mixed for 20-30 minutes, then poured into a mold, aged and dried to obtain an anti-aging polyurethane sponge.

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