Pressure-resistant elastic sponge as well as preparation method and application thereof

Abstract

The invention discloses pressure-resistant elastic sponge as well as a preparation method and application thereof, and relates to the technical field of sponge materials. The invention relates to a pressure-resistant elastic sponge, which comprises polyether polyol, a POP; an isocyanate; water; an auxiliary blowing agent; a catalyst; a surfactant; a flame retardant; a filler; the preparation method comprises the following steps: S1, pretreating the raw materials; s2, performing premixing; s3, adding isocyanate; s4, foaming and forming; and S5, curing and post-processing. The pressure-resistant elastic sponge is applied to the field of automotive interiors. According to the invention, polyether polyol and POP are compounded, so that the prepared sponge can be more balanced in the aspects of elasticity, bearing performance and pressure resistance; the amine catalyst and the tin catalyst are compounded, the addition amount of the amine catalyst and the tin catalyst is limited, the gel reaction is accelerated, the foaming reaction is promoted, and the pressure resistance and the elasticity of the sponge are improved; the pressure-resistant elastic sponge is more suitable for being applied to automotive interiors.

Description

Technical Field

[0001] The present application relates to the technical field of sponge materials, and in particular to a pressure-resistant elastic sponge and a preparation method and application thereof. Background Art

[0002] Sponge is a common filling material, especially in furniture, car seats, mattresses and other daily necessities. Sponge is an indispensable material. The resilience, comfort and durability of sponge make it widely used.

[0003] The automotive interior is also an important application field for sponges, but the performance requirements of automotive interiors are particularly strict. Traditional sponge materials have many deficiencies in resilience and durability, and it is difficult to meet the needs of automotive interiors. Therefore, developing a sponge material with good pressure resistance, deformation resistance, and good elasticity is a technical problem that needs to be solved at present. Summary of the invention

[0004] In order to solve at least one of the above technical problems, a sponge with good pressure resistance and elasticity is developed. The present application provides a pressure-resistant elastic sponge and a preparation method and application thereof.

[0005] In one aspect, the present application provides a pressure-resistant elastic sponge, comprising the following components in parts by weight:

[0006] 100 parts of polyether polyol;

[0007] POP 20-30 copies;

[0008] 40-55 parts of isocyanate;

[0009] 2.0-3.5 parts of water;

[0010] 5-10 parts of auxiliary foaming agent;

[0011] Catalyst 0.1-0.3 parts;

[0012] 1 to 2.5 parts of surfactant;

[0013] 10-15 parts of flame retardant;

[0014] 5 to 15 parts of filler;

[0015] 0.5 to 1 part of antioxidant.

[0016] Optionally, the hydroxyl value of the polyether polyol is 40-60.

[0017] Optionally, the isocyanate is MDI with an index of 1.05 to 1.10.

[0018] Optionally, the catalyst includes an amine catalyst and a tin catalyst, and the weight ratio of the amine catalyst to the tin catalyst is 2 to 3.5:1.

[0019] Optionally, the surfactant is silicone oil;

[0020] And / or, the filler is calcium carbonate;

[0021] And / or, the flame retardant is TCPP;

[0022] And / or, the antioxidant is BHT.

[0023] Optionally, the particle size of the calcium carbonate does not exceed 1 μm.

[0024] In a second aspect, the present application provides a method for preparing the above-mentioned pressure-resistant elastic sponge, comprising the following steps:

[0025] S1. Raw material pretreatment

[0026] Dehydration treatment is performed on polyether polyol and POP, and drying treatment is performed on fillers;

[0027] S2, premix

[0028] Add the mixture of polyether polyol and POP, stir, add water and physical foaming agent, continue stirring, add catalyst, continue stirring, add surfactant, continue stirring, add flame retardant, filler and antioxidant, continue stirring until uniform without stratification, to obtain premix;

[0029] S3, isocyanate addition

[0030] The temperature of the premix is ​​maintained at 22-25° C., the isocyanate is preheated to 25-30° C., and mixed and stirred evenly according to the formula ratio to obtain a mixture;

[0031] S4, Foaming molding

[0032] The mixed material prepared in S3 is poured into a mold for foaming to obtain a foamed material;

[0033] S5. Ripening and post-processing

[0034] The foamed material obtained in S4 is subjected to a aging treatment, and then cut, shaped and surface treated to obtain a sponge.

[0035] Optionally, the dehydration treatment in S1 is: dehydration for 2 hours at 80-100° C. and a vacuum degree of -0.095 MPa, with the moisture content not exceeding 0.05%;

[0036] And / or, the drying treatment is: drying at 120° C. for 4 hours.

[0037] Optionally, in S2, the stirring speed is 2000-3000 r / min;

[0038] And / or, in S3, the stirring speed is 5000-8000 r / min;

[0039] And / or, in S4, the mold temperature is controlled at 45-55° C.; the foaming time is: 3-5 min in the free foaming stage, and 20-40 s in the milky time;

[0040] And / or, in S5, the aging treatment is: aging at 80° C. for 2 to 4 hours.

[0041] In a third aspect, the present application provides the application of the above-mentioned pressure-resistant elastic sponge in the field of automobile interior decoration.

[0042] In summary, the present invention includes at least one of the following beneficial technical effects:

[0043] By compounding polyether polyol with POP, the prepared sponge can have more balanced performance in terms of elasticity, load-bearing capacity and pressure resistance; by compounding amine catalyst with tin catalyst and limiting the addition amount of amine catalyst and tin catalyst, the gel reaction is accelerated and the foaming reaction is promoted, so that the pressure resistance and elasticity of the sponge are improved; the obtained pressure-resistant elastic sponge is more suitable for application in automobile interior. DETAILED DESCRIPTION

[0044] The present application is further described in detail below with reference to the embodiments.

[0045] In the following examples of the present application, the main components involved, unless otherwise specified, were purchased from commercially available products.

[0046] Polyether polyol: hydroxyl value 40-60.

[0047] Isocyanate: MDI (index 1.05~1.10)

[0048] Blowing agent: HFC-245fa;

[0049] Amine catalyst: TEDA;

[0050] Tin catalyst: dibutyltin dilaurate;

[0051] Silicone oil: L-580;

[0052] Flame retardant: TCPP;

[0053] Antioxidant: BHT;

[0054] Filler: Calcium carbonate having a particle size not exceeding 1 μm is used as an example. Specific embodiments

[0056] Example 1

[0057] First, the polyether polyol and POP are dehydrated at 80°C and vacuum degree -0.095MPa for 2 hours, and the moisture content does not exceed 0.05%; the filler is dried at 120°C for 4 hours;

[0058] Add a mixture of 100 parts by weight of polyether polyol and 20 parts by weight of POP, stir at a speed of 20000 r / min, add 2 parts by weight of water and 5 parts by weight of physical foaming agent, continue to stir at a speed of 2000 r / min, add 0.1 parts by weight of amine catalyst, continue to stir at a speed of 2000 r / min, add 1 part by weight of silicone oil, continue to stir at a speed of 2000 r / min, add 10 parts by weight of flame retardant and 5 parts by weight of filler, 0.5 parts by weight of antioxidant, continue to stir at a speed of 2000 r / min for 3 minutes until uniform without stratification, to obtain a premix;

[0059] The temperature of the premix is ​​maintained at 25° C., 40 parts by weight of isocyanate is preheated to 30° C., and stirred at a speed of 6000 r / min for 1.5 s to obtain a mixture;

[0060] The mixed material is poured into a mold, and the mold temperature is controlled at 50°C; the foaming time is: 3 minutes for the free foaming stage, and 30 seconds for the milky time, to obtain a foamed material;

[0061] The foamed material was matured at 80°C for 3h, and cut by a CNC cutting machine with a blade temperature of 60°C to obtain a sponge.

[0062] Example 2

[0063] First, the polyether polyol and POP are dehydrated at 80°C and vacuum degree -0.095MPa for 2 hours, and the moisture content does not exceed 0.05%; the filler is dried at 120°C for 4 hours;

[0064] Add a mixture of 100 parts by weight of polyether polyol and 22 parts by weight of POP, stir at a speed of 20000 r / min, add 2.5 parts by weight of water and 8 parts by weight of physical foaming agent, continue to stir at a speed of 2000 r / min, add 0.2 parts by weight of tin catalyst, continue to stir at a speed of 2000 r / min, add 1.5 parts by weight of silicone oil, continue to stir at a speed of 2000 r / min, add 12 parts by weight of flame retardant and 10 parts by weight of filler, 0.8 parts by weight of antioxidant, continue to stir at a speed of 2000 r / min for 3 minutes until uniform and without stratification, to obtain a premix;

[0065] The temperature of the premix is ​​maintained at 25° C., 45 parts by weight of isocyanate is preheated to 30° C., and stirred at a speed of 6000 r / min for 1.5 s to obtain a mixture;

[0066] The mixed material is poured into a mold, and the mold temperature is controlled at 50°C; the foaming time is: 3 minutes for the free foaming stage, and 30 seconds for the milky time, to obtain a foamed material;

[0067] The foamed material was matured at 80°C for 3h, and cut by a CNC cutting machine with a blade temperature of 60°C to obtain a sponge.

[0068] Example 3

[0069] First, the polyether polyol and POP are dehydrated at 80°C and vacuum degree -0.095MPa for 2 hours, and the moisture content does not exceed 0.05%; the filler is dried at 120°C for 4 hours;

[0070] Add a mixture of 100 parts by weight of polyether polyol and 25 parts by weight of POP, stir at a speed of 20000 r / min, add 2.8 parts by weight of water and 8 parts by weight of physical foaming agent, continue to stir at a speed of 2000 r / min, add 0.2 parts by weight of amine catalyst and 0.1 parts by weight of tin catalyst, continue to stir at a speed of 2000 r / min, add 1.8 parts by weight of silicone oil, continue to stir at a speed of 2000 r / min, add 15 parts by weight of flame retardant and 15 parts by weight of filler, 1 part by weight of antioxidant, continue to stir at a speed of 2000 r / min for 3 minutes until uniform and without stratification, to obtain a premix;

[0071] The temperature of the premix is ​​maintained at 25° C., 48 parts by weight of isocyanate is preheated to 30° C., and stirred at a speed of 6000 r / min for 1.5 seconds to obtain a mixture;

[0072] The mixed material is poured into a mold, and the mold temperature is controlled at 50°C; the foaming time is: 3 minutes for the free foaming stage, and 30 seconds for the milky time, to obtain a foamed material;

[0073] The foamed material was matured at 80°C for 3h, and cut by a CNC cutting machine with a blade temperature of 60°C to obtain a sponge.

[0074] Example 4

[0075] First, the polyether polyol and POP are dehydrated at 80°C and vacuum degree -0.095MPa for 2 hours, and the moisture content does not exceed 0.05%; the filler is dried at 120°C for 4 hours;

[0076] Add a mixture of 100 parts by weight of polyether polyol and 28 parts by weight of POP, stir at a speed of 20000 r / min, add 3 parts by weight of water and 10 parts by weight of physical foaming agent, continue to stir at a speed of 2000 r / min, add 0.1 parts by weight of amine catalyst and 0.1 parts by weight of tin catalyst, continue to stir at a speed of 2000 r / min, add 2 parts by weight of silicone oil, continue to stir at a speed of 2000 r / min, add 12 parts by weight of flame retardant and 10 parts by weight of filler, 0.8 parts by weight of antioxidant, continue to stir at a speed of 2000 r / min for 3 minutes until uniform without stratification, to obtain a premix;

[0077] The temperature of the premix is ​​maintained at 25° C., 50 parts by weight of isocyanate is preheated to 30° C., and stirred at a speed of 6000 r / min for 1.5 seconds to obtain a mixture;

[0078] The mixed material is poured into a mold, and the mold temperature is controlled at 50°C; the foaming time is: 3 minutes for the free foaming stage, and 30 seconds for the milky time, to obtain a foamed material;

[0079] The foamed material was matured at 80°C for 3h, and cut by a CNC cutting machine with a blade temperature of 60°C to obtain a sponge.

[0080] Example 5

[0081] First, the polyether polyol and POP are dehydrated at 80°C and vacuum degree -0.095MPa for 2 hours, and the moisture content does not exceed 0.05%; the filler is dried at 120°C for 4 hours;

[0082] Add a mixture of 100 parts by weight of polyether polyol and 30 parts by weight of POP, stir at a speed of 20000 r / min, add 3.5 parts by weight of water and 10 parts by weight of physical foaming agent, continue to stir at a speed of 2000 r / min, add 0.05 parts by weight of amine catalyst and 0.05 parts by weight of tin catalyst, continue to stir at a speed of 2000 r / min, add 2.5 parts by weight of silicone oil, continue to stir at a speed of 2000 r / min, add 10 parts by weight of flame retardant and 5 parts by weight of filler, 0.5 parts by weight of antioxidant, continue to stir at a speed of 2000 r / min for 3 minutes until uniform and without stratification, to obtain a premix;

[0083] The temperature of the premix was maintained at 25° C., 55 parts by weight of isocyanate was preheated to 30° C., and stirred at a speed of 6000 r / min for 1.5 s to obtain a mixture;

[0084] The mixed material is poured into a mold, and the mold temperature is controlled at 50°C; the foaming time is: 3 minutes for the free foaming stage, and 30 seconds for the milky time, to obtain a foamed material;

[0085] The foamed material was matured at 80°C for 3h, and cut by a CNC cutting machine with a blade temperature of 60°C to obtain a sponge.

[0086] The compression permanent deformation rate of the sponge was tested with reference to ASTM D3574-D, and the resilience (vertical) of the sponge was tested with reference to GB / T6670. The test results are shown in Table 1.

[0087] Table 1

[0088] sponge Amine catalyst / part by weight Tin catalyst / weight ratio Deformation rate / % Rebound rate / % Example 1 0.1 / / 8.5 52 Example 2 / 0.2 / 9.6 48 Example 3 0.2 0.1 2:1 7.6 59 Example 4 0.1 0.1 1:1 8.3 55 Example 5 0.5 0.5 1:1 8.1 57

[0089] It can be seen from Examples 1 to 5 and Table 1 that the sponge prepared by the technical solution of the present application has a low compression permanent deformation rate, not exceeding 10%, and has strong pressure resistance; the rebound rate is high, reaching more than 48%, and has good elasticity; it is a pressure-resistant elastic sponge, which is very suitable for use in the field of automotive interior technology.

[0090] In order to verify the effect of the amount of amine catalyst and tin catalyst added on the sponge performance, the inventors prepared the following Examples 6 to 10 for further verification.

[0091] Examples 6 to 10 are based on Examples 1 to 5, respectively, except that only the addition amount of the amine catalyst and the tin catalyst in the catalyst is changed, and the total addition amount of the catalyst remains unchanged, as shown below.

[0092] Example 6

[0093] First, the polyether polyol and POP are dehydrated at 80°C and vacuum degree -0.095MPa for 2 hours, and the moisture content does not exceed 0.05%; the filler is dried at 120°C for 4 hours;

[0094] Add a mixture of 100 parts by weight of polyether polyol and 20 parts by weight of POP, stir at a speed of 20000 r / min, add 2 parts by weight of water and 5 parts by weight of physical foaming agent, continue to stir at a speed of 2000 r / min, add 0.067 parts by weight of amine catalyst and 0.033 parts by weight of tin catalyst, continue to stir at a speed of 2000 r / min, add 1 part by weight of silicone oil, continue to stir at a speed of 2000 r / min, add 10 parts by weight of flame retardant and 5 parts by weight of filler, 0.5 parts by weight of antioxidant, continue to stir at a speed of 2000 r / min for 3 minutes until uniform without stratification, to obtain a premix;

[0095] The temperature of the premix is ​​maintained at 25° C., 40 parts by weight of isocyanate is preheated to 30° C., and stirred at a speed of 6000 r / min for 1.5 s to obtain a mixture;

[0096] The mixed material is poured into a mold, and the mold temperature is controlled at 50°C; the foaming time is: 3 minutes for the free foaming stage, and 30 seconds for the milky time, to obtain a foamed material;

[0097] The foamed material was matured at 80°C for 3h, and cut by a CNC cutting machine with a blade temperature of 60°C to obtain a sponge.

[0098] Example 7

[0099] First, the polyether polyol and POP are dehydrated at 80°C and vacuum degree -0.095MPa for 2 hours, and the moisture content does not exceed 0.05%; the filler is dried at 120°C for 4 hours;

[0100] Add a mixture of 100 parts by weight of polyether polyol and 22 parts by weight of POP, stir at a speed of 20000 r / min, add 2.5 parts by weight of water and 8 parts by weight of physical foaming agent, continue to stir at a speed of 2000 r / min, add 0.143 parts by weight of amine catalyst and 0.057 parts by weight of tin catalyst, continue to stir at a speed of 2000 r / min, add 1.5 parts by weight of silicone oil, continue to stir at a speed of 2000 r / min, add 12 parts by weight of flame retardant and 10 parts by weight of filler, 0.8 parts by weight of antioxidant, continue to stir at a speed of 2000 r / min for 3 minutes until uniform and without stratification, to obtain a premix;

[0101] The temperature of the premix is ​​maintained at 25° C., 45 parts by weight of isocyanate is preheated to 30° C., and stirred at a speed of 6000 r / min for 1.5 seconds to obtain a mixture;

[0102] The mixed material is poured into a mold, and the mold temperature is controlled at 50°C; the foaming time is: 3 minutes for the free foaming stage, and 30 seconds for the milky time, to obtain a foamed material;

[0103] The foamed material was matured at 80°C for 3h, and cut by a CNC cutting machine with a blade temperature of 60°C to obtain a sponge.

[0104] Example 8

[0105] First, the polyether polyol and POP are dehydrated at 80°C and vacuum degree -0.095MPa for 2 hours, and the moisture content does not exceed 0.05%; the filler is dried at 120°C for 4 hours;

[0106] Add a mixture of 100 parts by weight of polyether polyol and 25 parts by weight of POP, stir at a speed of 20000 r / min, add 2.8 parts by weight of water and 8 parts by weight of physical foaming agent, continue to stir at a speed of 2000 r / min, add 0.225 parts by weight of amine catalyst and 0.075 parts by weight of tin catalyst, continue to stir at a speed of 2000 r / min, add 1.8 parts by weight of silicone oil, continue to stir at a speed of 2000 r / min, add 15 parts by weight of flame retardant and 15 parts by weight of filler, 1 part by weight of antioxidant, continue to stir at a speed of 2000 r / min for 3 minutes until uniform without stratification, to obtain a premix;

[0107] The temperature of the premix is ​​maintained at 25° C., 48 parts by weight of isocyanate is preheated to 30° C., and stirred at a speed of 6000 r / min for 1.5 seconds to obtain a mixture;

[0108] The mixed material is poured into a mold, and the mold temperature is controlled at 50°C; the foaming time is: 3 minutes for the free foaming stage, and 30 seconds for the milky time, to obtain a foamed material;

[0109] The foamed material was matured at 80°C for 3h, and cut by a CNC cutting machine with a blade temperature of 60°C to obtain a sponge.

[0110] Example 9

[0111] First, the polyether polyol and POP are dehydrated at 80°C and vacuum degree -0.095MPa for 2 hours, and the moisture content does not exceed 0.05%; the filler is dried at 120°C for 4 hours;

[0112] Add a mixture of 100 parts by weight of polyether polyol and 28 parts by weight of POP, stir at a speed of 20000 r / min, add 3 parts by weight of water and 10 parts by weight of physical foaming agent, continue to stir at a speed of 2000 r / min, add 0.156 parts by weight of amine catalyst and 0.044 parts by weight of tin catalyst, continue to stir at a speed of 2000 r / min, add 2 parts by weight of silicone oil, continue to stir at a speed of 2000 r / min, add 12 parts by weight of flame retardant and 10 parts by weight of filler, 0.8 parts by weight of antioxidant, continue to stir at a speed of 2000 r / min for 3 minutes until uniform and without stratification, to obtain a premix;

[0113] The temperature of the premix is ​​maintained at 25° C., 50 parts by weight of isocyanate is preheated to 30° C., and stirred at a speed of 6000 r / min for 1.5 seconds to obtain a mixture;

[0114] The mixed material is poured into a mold, and the mold temperature is controlled at 50°C; the foaming time is: 3 minutes for the free foaming stage, and 30 seconds for the milky time, to obtain a foamed material;

[0115] The foamed material was matured at 80°C for 3h, and cut by a CNC cutting machine with a blade temperature of 60°C to obtain a sponge.

[0116] Example 10

[0117] First, the polyether polyol and POP are dehydrated at 80°C and vacuum degree -0.095MPa for 2 hours, and the moisture content does not exceed 0.05%; the filler is dried at 120°C for 4 hours;

[0118] Add a mixture of 100 parts by weight of polyether polyol and 30 parts by weight of POP, stir at a speed of 20000 r / min, add 3.5 parts by weight of water and 10 parts by weight of physical foaming agent, continue to stir at a speed of 2000 r / min, add 0.080 parts by weight of amine catalyst and 0.020 parts by weight of tin catalyst, continue to stir at a speed of 2000 r / min, add 2.5 parts by weight of silicone oil, continue to stir at a speed of 2000 r / min, add 10 parts by weight of flame retardant and 5 parts by weight of filler, 0.5 parts by weight of antioxidant, continue to stir at a speed of 2000 r / min for 3 minutes until uniform without stratification, to obtain a premix;

[0119] The temperature of the premix was maintained at 25° C., 55 parts by weight of isocyanate was preheated to 30° C., and stirred at a speed of 6000 r / min for 1.5 s to obtain a mixture;

[0120] The mixed material is poured into a mold, and the mold temperature is controlled at 50°C; the foaming time is: 3 minutes for the free foaming stage, and 30 seconds for the milky time, to obtain a foamed material;

[0121] The foamed material was matured at 80°C for 3h, and cut by a CNC cutting machine with a blade temperature of 60°C to obtain a sponge.

[0122] The compression permanent deformation rate of the sponge was tested with reference to ASTM D3574-D, and the resilience (vertical) of the sponge was tested with reference to GB / T6670. The test results are shown in Table 2.

[0123] Table 2

[0124] sponge Amine catalyst / part by weight Tin catalyst / weight ratio Deformation rate / % Rebound rate / % Example 6 0.067 0.033 2:1 7.3 57 Example 7 0.143 0.057 2.5:1 4.8 63 Example 8 0.225 0.075 3:1 4.2 68 Example 9 0.156 0.044 3.5:1 4.3 66 Example 10 0.080 0.020 4:1 6.8 59

[0125] It can be seen from Examples 6 to 10 and Table 2 that when the weight ratio of the amine catalyst to the tin catalyst in the catalyst of the applied technical solution is controlled in the range of 2.5 to 3.5:1, the compression permanent deformation rate of the prepared sponge is lower than 4.8%, and the rebound rate is higher than 63%.

[0126] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pressure-resistant elastic sponge, characterized in that: The composition comprises the following components by weight: 100 parts of polyether polyol; POP 20-30 copies; 40-55 parts of isocyanate; 2.0-3.5 parts of water; 5-10 parts of auxiliary foaming agent; Catalyst 0.1-0.3 parts; 1 to 2.5 parts of surfactant; 10-15 parts of flame retardant; 5 to 15 parts of filler; 0.5 to 1 part of antioxidant.

2. The pressure-resistant elastic sponge according to claim 1, characterized in that: The hydroxyl value of the polyether polyol is 40-60.

3. The pressure-resistant elastic sponge according to claim 1, characterized in that: The isocyanate is MDI, and the index is 1.05-1.

10.

4. The pressure-resistant elastic sponge according to claim 1, characterized in that: The catalyst comprises an amine catalyst and a tin catalyst, and the weight ratio of the amine catalyst to the tin catalyst is 2 to 3.5:

1.

5. The pressure-resistant elastic sponge according to claim 1, characterized in that: The surfactant is silicone oil; And / or, the filler is calcium carbonate; And / or, the flame retardant is TCPP; And / or, the antioxidant is BHT.

6. The pressure-resistant elastic sponge according to claim 1, characterized in that: The particle size of the calcium carbonate does not exceed 1 μm.

7. A method for preparing the pressure-resistant elastic sponge according to claim 1, characterized in that: The following steps are involved: S1. Raw material pretreatment Dehydration treatment is performed on polyether polyol and POP, and drying treatment is performed on fillers; S2, premix Add the mixture of polyether polyol and POP, stir, add water and physical foaming agent, continue stirring, add catalyst, continue stirring, add surfactant, continue stirring, add flame retardant, filler and antioxidant, continue stirring until uniform without stratification, to obtain premix; S3, isocyanate addition The temperature of the premix is ​​maintained at 22-25° C., the isocyanate is preheated to 25-30° C., and mixed and stirred evenly according to the formula ratio to obtain a mixture; S4, Foaming molding The mixed material prepared in S3 is poured into a mold for foaming to obtain a foamed material; S5. Ripening and post-processing The foamed material obtained in S4 is subjected to a aging treatment, and then cut, shaped and surface treated to obtain a sponge.

8. The preparation method according to claim 1, characterized in that: The dehydration treatment in S1 is: dehydration for 2 hours at 80-100°C and vacuum degree -0.095MPa, and the moisture content does not exceed 0.05%; And / or, the drying treatment is: drying at 120° C. for 4 hours.

9. The preparation method according to claim 1, characterized in that: In S2, the stirring speed is 2000-3000r / min; And / or, in S3, the stirring speed is 5000-8000 r / min; And / or, in S4, the mold temperature is controlled at 45-55° C.; the foaming time is: 3-5 min in the free foaming stage, and 20-40 s in the milky time; And / or, in S5, the aging treatment is: aging at 80° C. for 2 to 4 hours.

10. Use of the pressure-resistant elastic sponge according to claim 1 in the field of automobile interior decoration.