High-tear-strength and high-resilience sponge and preparation method thereof

Abstract

The invention discloses a high tear strength and high resilience sponge and a preparation method thereof, and belongs to the technical field of sponge material preparation, the high tear strength and high resilience sponge comprises the following components by weight: 50-80 parts of open-cell polyether, 10-24 parts of a first monomer, 4-11 parts of a second monomer, 45-65 parts of polymerized MDI, 1-5 parts of liquefied MDI, 0.5-1.5 parts of silicone oil, 0.5-1 part of a catalyst, and 2-4 parts of deionized water. The first monomer comprises a benzoindolizine structure, and the second monomer comprises a trinitrofluorenone structure; according to the invention, a benzoindolizine group and a trinitrofluorenone group are introduced into a polyurethane side chain at the same time to construct a host-guest composite cross-linking system, so that the mechanical properties of the polyurethane sponge material are effectively improved while the rebound resilience of the polyurethane sponge material is maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of sponge material preparation, and in particular to a high-tear strength and high-rebound sponge and a preparation method thereof. Background Art

[0002] Sponge is a type of polyurethane foam, classified as a flexible polyurethane foam. Due to its porous honeycomb structure, it possesses excellent softness, elasticity, water absorption, and water resistance, making it widely used in various industries, including sofas, mattresses, clothing, and flexible packaging. High-resilience sponge, a widely used sponge, produces varying degrees of support and rebound force under pressure in different deformation states. Therefore, sofas, seat cushions, and mattresses made with high-resilience sponge offer enhanced comfort, resulting in a more ideal comfort factor. It is an ideal material for high-end car seats, sofas, and office chairs.

[0003] The polyether polyols currently used in high-resilience sponges are generally capped with EO or PO, resulting in high polyether activity. The resulting sponges have a mixed distribution of pore diameters, varying skeleton thicknesses, and a high open porosity. This maintains the inherent flexibility of the polyether chain while retaining the favorable structural properties of vinyl polymers, giving the polyurethane sponge a high load-bearing capacity and excellent rebound performance. This increases the foam's open porosity and is widely used in the production of high-load, high-resilience soft and semi-rigid polyurethane foams. However, due to the relatively low molecular weight of conventional polyurethane high-resilience sponges, they exhibit weak tensile and tear strengths and exhibit high compression deformation, which impacts the quality and service life of high-resilience sponge products. Summary of the Invention

[0004] In view of the above problems, the present invention provides a high tear strength and high resilience sponge and a preparation method thereof.

[0005] The purpose of the present invention is achieved by adopting the following technical solutions:

[0006] A high tear strength and high resilience sponge, comprising the following components in parts by weight:

[0007] 50-80 parts of open-cell polyether, 10-24 parts of the first monomer, 4-11 parts of the second monomer, 45-65 parts of polymeric MDI, 1-5 parts of liquefied MDI, 0.5-1.5 parts of silicone oil, 0.5-1 part of catalyst, and 2-4 parts of deionized water;

[0008] The preparation method of the first monomer comprises the following steps:

[0009] (1) 8-bromoisoquinoline-2-oxide and 1,3-diphenylprop-2-yn-1-one were weighed and dissolved in dimethylformamide solvent, copper acetate was added as a catalyst, the temperature was raised to 80-100°C and the mixture was stirred and reacted for 10-20 hours. After the reaction was completed, the mixture was concentrated under reduced pressure, diluted with water, and extracted with ethyl acetate. The organic phase was dried, concentrated, and purified on a silica gel column to obtain product A;

[0010] (2) dispersing and dissolving the product A in an ethanol aqueous solution, adding cuprous oxide and sodium hydroxide, sealing the reaction system and keeping the temperature at 180-240° C. for 2-12 hours. After the reaction is completed, cooling, concentrating, diluting with water, extracting with ethyl acetate, and distilling the organic phase under reduced pressure to remove the solvent to obtain product B;

[0011] (3) dispersing and dissolving the product B and 3-chloro-1,2-propanediol in a toluene solvent, adding sodium hydroxide and tetrabutylammonium bromide, and reacting at 80-100° C. with stirring for 4-12 hours, washing with deionized water, drying the organic phase, and then evaporating the solvent under reduced pressure to obtain product C, which is the first monomer;

[0012] The preparation method of the second monomer comprises the following steps:

[0013] S1. Weigh 2,5,7-trinitro-9-oxo-9H-fluorene-4-carboxylic acid methyl ester and dissolve it in dimethylformamide solvent, add 2,5-dibromohydroquinone and potassium carbonate, and react at 50-80°C with stirring for 12-24 hours. Dilute with water, extract with ethyl acetate, and dry, concentrate, and purify the organic phase with a silica gel column to obtain product D.

[0014] S2, dissolving the product D in tetrahydrofuran solvent, adding 4-ethynylbenzaldehyde, triethylamine and a catalyst, stirring and reacting at 40-50° C. for 6-10 hours, removing the precipitate and extracting with ethyl acetate, washing the organic phase with saturated ammonium chloride solution and saturated sodium chloride solution in sequence, drying and evaporating the solvent to obtain product E;

[0015] S3. Dissolve the product E in tetrahydrofuran solvent, add lithium aluminum hydride, and react at room temperature with stirring for 10-60 minutes. After the reaction is completed, add saturated sodium sulfate solution to dilute the reaction system, extract with chloroform, wash the organic phase with saturated sodium chloride solution, dry it, and evaporate to remove the solvent to obtain product F, which is the second monomer.

[0016] In some preferred embodiments, the open-cell polyether is obtained by random polymerization of propylene oxide and ethylene oxide using glycerol as an initiator; the hydroxyl value is 38 mgKOH / g, and the content of ethylene oxide is not less than 70% of the total mass.

[0017] In some preferred embodiments, the polymeric MDI is polyphenyl polymethylene polyisocyanate, with the brand name PM-200.

[0018] In some preferred embodiments, the liquefied MDI is carbodiimide-uretonimine modified 4,4'-diphenylmethane diisocyanate, with the brand name MDI-100L.

[0019] In some preferred embodiments, the silicone oil is TEGOSTAB B8002.

[0020] In some preferred embodiments, the mass ratio of the 8-bromoisoquinoline-2-oxide to the 1,3-diphenylprop-2-yn-1-one and the copper acetate in step (1) is 10:(20-26):(1.5-2).

[0021] In some preferred embodiments, the mass ratio of the product A to the cuprous oxide and the sodium hydroxide in step (2) is 10:(0.05-0.15):(1.4-2.5).

[0022] In some preferred embodiments, the mass ratio of the product B to the 3-chloro-1,2-propanediol, the sodium hydroxide, and the tetrabutylammonium bromide in step (3) is 10:(2.6-3.5):(3.5-4.8):(0.01-0.1).

[0023] In some preferred embodiments, the mass ratio of the 2,5,7-trinitro-9-oxo-9H-fluorene-4-carboxylic acid methyl ester to the 2,5-dibromohydroquinone and the potassium carbonate in step S1 is 10:(2.5-3.5):(8.4-9.8).

[0024] In some preferred embodiments, the mass ratio of the product D to the 4-ethynylbenzaldehyde, the triethylamine, and the catalyst in step S2 is 10:(11-12.2):(22-24):(2.7-3.6).

[0025] In some preferred embodiments, the catalyst is a mixture of cuprous iodide and bistriphenylphosphine palladium dichloride in a mass ratio of 1:(1.5-2).

[0026] In some preferred embodiments, the mass ratio of the product E to the lithium aluminum hydride in step S3 is 10:(1.7-2.3).

[0027] In some preferred embodiments, the catalyst includes tin catalyst T9, amine catalyst A33 and amine catalyst A1; wherein the mass ratio of the tin catalyst T9 to the amine catalyst A33 and the amine catalyst A1 is (1-2): (8-10): 1.

[0028] The second aspect of the present invention is to provide a method for preparing the high tear strength and high resilience sponge, comprising the following steps:

[0029] The flow rates of raw materials such as polymeric MDI, liquefied MDI, open-cell polyether, the first monomer, the second monomer, silicone oil, the catalyst and deionized water are determined according to their weight proportions; the raw materials are flowed into the stirring chamber of the sponge foaming machine according to the formula ratio, stirred at high speed, and flowed into the sponge foaming production line to foam to form a sponge, thereby obtaining the high tear strength and high resilience sponge.

[0030] In some preferred embodiments, the stirring temperature is 20-25° C., the stirring speed is 1800-4000 r / min, and the stirring time is 1-3 s.

[0031] The beneficial effects of the present invention are:

[0032] In view of the problems of weak tensile strength and tear strength and large compression deformation of polyurethane high-rebound sponges in the prior art, the present invention provides a high-tear-strength and high-rebound sponge and a preparation method thereof. The sponge is compounded with a first monomer and a second monomer on the basis of existing polyether polyol as a reaction raw material, and a benzindolizine group and a trinitrofluorenone group are introduced into the polyurethane side chain respectively. The electron-rich property of the indolizine ring is used as the main body, and trinitrofluorenone is used as the electron-deficient guest molecule to generate a host-guest composite cross-linking system, which effectively improves the resilience of the polyurethane sponge material while maintaining the resilience of the polyurethane sponge material. The mechanical properties of the ester sponge material are as follows: the first monomer is prepared by using 1,3-diphenylprop-2-yn-1-one and 8-bromoisoquinoline-2-oxide as raw materials, and a [2+2+1] cyclization reaction forms a benzindoleazine structure, and the bromine atom is replaced by a phenolic hydroxyl group and then reacted with 3-chloro-1,2-propanediol to introduce an alcoholic hydroxyl group; the second monomer is prepared by using trinitrofluorenonecarboxylic acid methyl ester and 2,5-dibromohydroquinone as raw materials to undergo an ester exchange reaction grafting, and then undergo a Sonogashira coupling reaction with 4-ethynylbenzaldehyde, and finally the aldehyde group is reduced to a hydroxyl group. DETAILED DESCRIPTION

[0033] The present invention is further described with reference to the following examples.

[0034] Example 1

[0035] A high tear strength and high resilience sponge, comprising the following components in parts by weight:

[0036] 65 parts of open-cell polyether, 16 parts of the first monomer, 6 parts of the second monomer, 50 parts of polymeric MDI, 2 parts of liquefied MDI, 1 part of silicone oil, 0.8 parts of catalyst, and 3 parts of deionized water; wherein:

[0037] The open-cell polyether is obtained by random polymerization of propylene oxide and ethylene oxide using glycerol as an initiator and KOH as a catalyst; the hydroxyl value is 38 mgKOH / g, and the content of ethylene oxide accounts for 75% of the total mass;

[0038] The preparation method of the first monomer comprises the following steps:

[0039] (1) 8-bromoisoquinoline-2-oxide (CAS No.: 475994-58-2) and 1,3-diphenylprop-2-yn-1-one (CAS No.: 7338-94-5) were weighed and dissolved in dimethylformamide solvent, copper acetate was added as a catalyst, the temperature was raised to 90°C and the mixture was stirred for 14 hours. After the reaction was completed, the mixture was concentrated under reduced pressure, diluted with water, and extracted with ethyl acetate. The organic phase was dried, concentrated, and purified by silica gel column, and a mixed solvent of ethyl acetate and hexane (v / v=1:9) was used as the eluent to obtain product A; the mass ratio of the 8-bromoisoquinoline-2-oxide to the 1,3-diphenylprop-2-yn-1-one and the copper acetate was 10:23:1.78;

[0040] (2) dispersing and dissolving the product A in an ethanol aqueous solution, adding cuprous oxide and sodium hydroxide, sealing the reaction system and keeping the temperature at 200° C. for 6 hours, cooling and concentrating after the reaction is completed, diluting with water, extracting with ethyl acetate, and evaporating the organic phase under reduced pressure to remove the solvent to obtain product B; the mass ratio of the product A to the cuprous oxide and the sodium hydroxide is 10:0.1:2;

[0041] (3) dispersing and dissolving the product B and 3-chloro-1,2-propylene glycol in a toluene solvent, adding sodium hydroxide and tetrabutylammonium bromide, and reacting at 100° C. with stirring for 8 hours, washing with deionized water, drying the organic phase, and removing the solvent under reduced pressure to obtain product C, which is the first monomer; the mass ratio of the product B to the 3-chloro-1,2-propylene glycol, the sodium hydroxide, and the tetrabutylammonium bromide is 10:3:4:0.05;

[0042] The preparation method of the second monomer comprises the following steps:

[0043] S1. Weigh 2,5,7-trinitro-9-oxo-9H-fluorene-4-carboxylic acid methyl ester (CAS No.: 24867-50-3) and dissolve it in dimethylformamide solvent, add 2,5-dibromohydroquinone (CAS No.: 14753-51-6), add potassium carbonate, and react at 65°C with stirring for 16 hours. Dilute with water, extract with ethyl acetate, and dry the organic phase, concentrate, and purify it on a silica gel column using a mixed solvent of ethyl acetate and hexane (v / v = 1:19) as the eluent to obtain product D; the mass ratio of the 2,5,7-trinitro-9-oxo-9H-fluorene-4-carboxylic acid methyl ester to the 2,5-dibromohydroquinone and the potassium carbonate is 10:2.94:9;

[0044] S2. Dissolve the product D in tetrahydrofuran solvent, add 4-ethynylbenzaldehyde, triethylamine and a catalyst, stir and react at 40°C for 8h, remove the precipitate and extract with ethyl acetate, wash the organic phase with saturated ammonium chloride solution and saturated sodium chloride solution in sequence, dry and evaporate to remove the solvent to obtain product E; the mass ratio of the product D to the 4-ethynylbenzaldehyde, the triethylamine and the catalyst is 10:11.2:23.2:3.1; the catalyst is a mixture of cuprous iodide and bistriphenylphosphine palladium dichloride, the mass ratio of which is 1:1.7;

[0045] S3, dissolving the product E in tetrahydrofuran solvent, adding lithium aluminum hydride, and reacting at room temperature with stirring for 10 minutes. After the reaction is completed, adding saturated sodium sulfate solution to dilute the reaction system, extracting with chloroform, washing the organic phase with saturated sodium chloride solution, drying, and evaporating the solvent to obtain product F, which is the second monomer; the mass ratio of the product E to the lithium aluminum hydride is 10:1.97;

[0046] The polymeric MDI is polyphenyl polymethylene polyisocyanate, with the brand name PM-200;

[0047] The liquefied MDI is carbodiimide-uretonimine modified 4,4'-diphenylmethane diisocyanate, with the brand name MDI-100L;

[0048] The silicone oil is TEGOSTAB B8002.

[0049] The catalyst includes a tin catalyst T9, an amine catalyst A33, and an amine catalyst A1; wherein the mass ratio of the tin catalyst T9 to the amine catalyst A33 and the amine catalyst A1 is 1:9:1;

[0050] The preparation method of the high tear strength and high resilience sponge comprises the following steps:

[0051] The flow rates of raw materials such as polymeric MDI, liquefied MDI, open-cell polyether, the first monomer, the second monomer, silicone oil, the catalyst and deionized water are determined according to their weight proportions; the raw materials are flowed into the stirring chamber of a sponge foaming machine according to the formula ratio, stirred at high speed, the stirring temperature is 20-25°C, the stirring speed is 1800-4000 r / min, and the stirring time is 1-3s, and then flowed into the sponge foaming production line to foam to form a sponge, thereby obtaining the high tear strength and high resilience sponge.

[0052] Example 2

[0053] A high tear strength and high resilience sponge, which is the same as Example 1, except that it comprises the following components in parts by weight:

[0054] 80 parts of open-cell polyether, 24 parts of the first monomer, 10 parts of the second monomer, 65 parts of polymerized MDI, 5 parts of liquefied MDI, 1.5 parts of silicone oil, 0.8 parts of catalyst, and 4 parts of deionized water.

[0055] Example 3

[0056] A high-resilience sponge, comprising the following components in parts by weight:

[0057] 65 parts of open-cell polyether, 6 parts of the second monomer, 50 parts of polymerized MDI, 2 parts of liquefied MDI, 1 part of silicone oil, 0.8 parts of catalyst, and 3 parts of deionized water; wherein:

[0058] The open-cell polyether is obtained by random polymerization of propylene oxide and ethylene oxide using glycerol as an initiator and KOH as a catalyst; the hydroxyl value is 38 mgKOH / g, and the content of ethylene oxide accounts for 75% of the total mass;

[0059] The preparation method of the second monomer comprises the following steps:

[0060] S1. Weigh 2,5,7-trinitro-9-oxo-9H-fluorene-4-carboxylic acid methyl ester and dissolve it in dimethylformamide solvent, add 2,5-dibromohydroquinone, add potassium carbonate, and react at 65°C with stirring for 16 hours. Dilute with water, extract with ethyl acetate, and dry, concentrate, and purify the organic phase with a silica gel column using a mixed solvent of ethyl acetate and hexane (v / v=1:19) as an eluent to obtain product D; the mass ratio of the 2,5,7-trinitro-9-oxo-9H-fluorene-4-carboxylic acid methyl ester to the 2,5-dibromohydroquinone and the potassium carbonate is 10:2.94:9;

[0061] S2. Dissolve the product D in tetrahydrofuran solvent, add 4-ethynylbenzaldehyde, triethylamine and a catalyst, stir and react at 40°C for 8h, remove the precipitate and extract with ethyl acetate, wash the organic phase with saturated ammonium chloride solution and saturated sodium chloride solution in sequence, dry and evaporate to remove the solvent to obtain product E; the mass ratio of the product D to the 4-ethynylbenzaldehyde, the triethylamine and the catalyst is 10:11.2:23.2:3.1; the catalyst is a mixture of cuprous iodide and bistriphenylphosphine palladium dichloride, the mass ratio of which is 1:1.7;

[0062] S3, dissolving the product E in tetrahydrofuran solvent, adding lithium aluminum hydride, and reacting at room temperature with stirring for 10 minutes. After the reaction is completed, adding saturated sodium sulfate solution to dilute the reaction system, extracting with chloroform, washing the organic phase with saturated sodium chloride solution, drying, and evaporating the solvent to obtain product F, which is the second monomer; the mass ratio of the product E to the lithium aluminum hydride is 10:1.97;

[0063] The polymeric MDI is polyphenyl polymethylene polyisocyanate, with the brand name PM-200;

[0064] The liquefied MDI is carbodiimide-uretonimine modified 4,4'-diphenylmethane diisocyanate, with the brand name MDI-100L;

[0065] The silicone oil is TEGOSTAB B8002.

[0066] The catalyst includes a tin catalyst T9, an amine catalyst A33, and an amine catalyst A1; wherein the mass ratio of the tin catalyst T9 to the amine catalyst A33 and the amine catalyst A1 is 1:9:1;

[0067] The preparation method of the high tear strength and high resilience sponge is the same as that in Example 1.

[0068] Example 4

[0069] A high-resilience sponge, comprising the following components in parts by weight:

[0070] 65 parts of open-cell polyether, 16 parts of the first monomer, 50 parts of polymeric MDI, 2 parts of liquefied MDI, 1 part of silicone oil, 0.8 parts of catalyst, and 3 parts of deionized water; wherein:

[0071] The open-cell polyether is obtained by random polymerization of propylene oxide and ethylene oxide using glycerol as an initiator and KOH as a catalyst; the hydroxyl value is 38 mgKOH / g, and the content of ethylene oxide accounts for 75% of the total mass;

[0072] The preparation method of the first monomer comprises the following steps:

[0073] (1) 8-bromoisoquinoline-2-oxide and 1,3-diphenylprop-2-yn-1-one were weighed and dissolved in dimethylformamide solvent, copper acetate was added as a catalyst, the temperature was raised to 90°C and the mixture was stirred and reacted for 14 hours. After the reaction was completed, the mixture was concentrated under reduced pressure, diluted with water, and extracted with ethyl acetate. The organic phase was dried, concentrated, and purified by silica gel column, and a mixed solvent of ethyl acetate and hexane (v / v=1:9) was used as the eluent to obtain product A; the mass ratio of the 8-bromoisoquinoline-2-oxide to the 1,3-diphenylprop-2-yn-1-one and the copper acetate was 10:23:1.78;

[0074] (2) dispersing and dissolving the product A in an ethanol aqueous solution, adding cuprous oxide and sodium hydroxide, sealing the reaction system and keeping the temperature at 200° C. for 6 hours, cooling and concentrating after the reaction is completed, diluting with water, extracting with ethyl acetate, and evaporating the organic phase under reduced pressure to remove the solvent to obtain product B; the mass ratio of the product A to the cuprous oxide and the sodium hydroxide is 10:0.1:2;

[0075] (3) dispersing and dissolving the product B and 3-chloro-1,2-propylene glycol in a toluene solvent, adding sodium hydroxide and tetrabutylammonium bromide, and reacting at 100° C. with stirring for 8 hours, washing with deionized water, drying the organic phase, and removing the solvent under reduced pressure to obtain product C, which is the first monomer; the mass ratio of the product B to the 3-chloro-1,2-propylene glycol, the sodium hydroxide, and the tetrabutylammonium bromide is 10:3:4:0.05;

[0076] The polymeric MDI is polyphenyl polymethylene polyisocyanate, with the brand name PM-200;

[0077] The liquefied MDI is carbodiimide-uretonimine modified 4,4'-diphenylmethane diisocyanate, with the brand name MDI-100L;

[0078] The silicone oil is TEGOSTAB B8002.

[0079] The catalyst includes a tin catalyst T9, an amine catalyst A33, and an amine catalyst A1; wherein the mass ratio of the tin catalyst T9 to the amine catalyst A33 and the amine catalyst A1 is 1:9:1;

[0080] The preparation method of the high tear strength and high resilience sponge is the same as that in Example 1.

[0081] Example 5

[0082] A high-resilience sponge, comprising the following components in parts by weight:

[0083] 65 parts of open-cell polyether, 50 parts of polymeric MDI, 2 parts of liquefied MDI, 1 part of silicone oil, 0.8 parts of catalyst, 3 parts of deionized water; wherein:

[0084] The open-cell polyether is obtained by random polymerization of propylene oxide and ethylene oxide using glycerol as an initiator and KOH as a catalyst; the hydroxyl value is 38 mgKOH / g, and the content of ethylene oxide accounts for 75% of the total mass;

[0085] The polymeric MDI is polyphenyl polymethylene polyisocyanate, with the brand name PM-200;

[0086] The liquefied MDI is carbodiimide-uretonimine modified 4,4'-diphenylmethane diisocyanate, with the brand name MDI-100L;

[0087] The silicone oil is TEGOSTAB B8002.

[0088] The catalyst includes a tin catalyst T9, an amine catalyst A33, and an amine catalyst A1; wherein the mass ratio of the tin catalyst T9 to the amine catalyst A33 and the amine catalyst A1 is 1:9:1;

[0089] The preparation method of the high tear strength and high resilience sponge is the same as that in Example 1.

[0090] The high-resilience sponges prepared in Examples 1-5 were tested and compared in terms of performance. The tensile strength was measured according to GB / T 6344-2008, the rebound rate was measured according to GB / T 6670-2008, the tear strength was measured according to GB / T 10808-2006, and the hardness was measured according to ISO 2439-2008. The test results are shown in the following table:

[0091]

[0092]

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A high tear strength and high resilience sponge, characterized in that: The composition is composed of the following components in parts by weight: 50-80 parts of open-cell polyether, 10-24 parts of the first monomer, 4-11 parts of the second monomer, 45-65 parts of polymeric MDI, 1-5 parts of liquefied MDI, 0.5-1.5 parts of silicone oil, 0.5-1 part of catalyst, and 2-4 parts of deionized water; The preparation method of the first monomer comprises the following steps: (1) 8-bromoisoquinoline-2-oxide and 1,3-diphenylprop-2-yn-1-one were weighed and dissolved in dimethylformamide solvent, copper acetate was added as a catalyst, the temperature was raised to 80-100°C and the mixture was stirred and reacted for 10-20 hours. After the reaction was completed, the mixture was concentrated under reduced pressure, diluted with water, and extracted with ethyl acetate. The organic phase was dried, concentrated, and purified on a silica gel column to obtain product A; (2) dispersing and dissolving the product A in an ethanol aqueous solution, adding cuprous oxide and sodium hydroxide, sealing the reaction system and keeping the temperature at 180-240° C. for 2-12 hours. After the reaction is completed, cooling, concentrating, diluting with water, extracting with ethyl acetate, and distilling the organic phase under reduced pressure to remove the solvent to obtain product B; (3) dispersing and dissolving the product B and 3-chloro-1,2-propanediol in a toluene solvent, adding sodium hydroxide and tetrabutylammonium bromide, and reacting at 80-100° C. with stirring for 4-12 hours, washing with deionized water, drying the organic phase, and then evaporating the solvent under reduced pressure to obtain product C, which is the first monomer; The preparation method of the second monomer comprises the following steps: S1. Weigh 2,5,7-trinitro-9-oxo-9H-fluorene-4-carboxylic acid methyl ester and dissolve it in dimethylformamide solvent, add 2,5-dibromohydroquinone and potassium carbonate, and react at 50-80°C with stirring for 12-24 hours. Dilute with water, extract with ethyl acetate, and dry, concentrate, and purify the organic phase with a silica gel column to obtain product D. S2, dissolving the product D in tetrahydrofuran solvent, adding 4-ethynylbenzaldehyde, triethylamine and a catalyst, stirring and reacting at 40-50° C. for 6-10 hours, removing the precipitate and extracting with ethyl acetate, washing the organic phase with saturated ammonium chloride solution and saturated sodium chloride solution in sequence, drying and evaporating the solvent to obtain product E; S3. Dissolve the product E in tetrahydrofuran solvent, add lithium aluminum hydride, and react at room temperature with stirring for 10-60 minutes. After the reaction is completed, add saturated sodium sulfate solution to dilute the reaction system, extract with chloroform, wash the organic phase with saturated sodium chloride solution, dry it, and evaporate to remove the solvent to obtain product F, which is the second monomer.

2. The high tear strength and high resilience sponge according to claim 1, characterized in that: The open-cell polyether is obtained by random polymerization of propylene oxide and ethylene oxide using glycerol as an initiator; the hydroxyl value is 38 mgKOH / g, and the content of ethylene oxide is not less than 70% of the total mass.

3. The high tear strength and high resilience sponge according to claim 1, characterized in that: The mass ratio of the 8-bromoisoquinoline-2-oxide, the 1,3-diphenylprop-2-yn-1-one, and the copper acetate in step (1) is 10:(20-26):(1.5-2).

4. The high tear strength and high resilience sponge according to claim 1, characterized in that: The mass ratio of the product A to the cuprous oxide and the sodium hydroxide in step (2) is 10:(0.05-0.15):(1.4-2.5).

5. The high tear strength and high resilience sponge according to claim 1, characterized in that: The mass ratio of the product B to the 3-chloro-1,2-propylene glycol, the sodium hydroxide, and the tetrabutylammonium bromide in step (3) is 10:(2.6-3.5):(3.5-4.8):(0.01-0.1).

6. The high tear strength and high resilience sponge according to claim 1, characterized in that: The mass ratio of the 2,5,7-trinitro-9-oxo-9H-fluorene-4-carboxylic acid methyl ester to the 2,5-dibromohydroquinone and the potassium carbonate in step S1 is 10:(2.5-3.5):(8.4-9.8).

7. The high tear strength and high resilience sponge according to claim 1, characterized in that: In step S2, the mass ratio of the product D to the 4-ethynylbenzaldehyde, the triethylamine, and the catalyst is 10:(11-12.2):(22-24):(2.7-3.6); the catalyst is a mixture of cuprous iodide and bistriphenylphosphine palladium dichloride, and the mass ratio is 1:(1.5-2).

8. The high tear strength and high resilience sponge according to claim 1, characterized in that: The mass ratio of the product E to the lithium aluminum hydride in step S3 is 10:(1.7-2.3).

9. The high tear strength and high resilience sponge according to claim 1, characterized in that: The catalyst includes a tin catalyst T9, an amine catalyst A33, and an amine catalyst A1; wherein the mass ratio of the tin catalyst T9 to the amine catalyst A33 and the amine catalyst A1 is (1-2): (8-10):

1.

10. The method for preparing a sponge with high tear strength and high resilience according to any one of claims 1 to 9, characterized in that: The following steps are involved: The flow rates of raw materials such as polymeric MDI, liquefied MDI, open-cell polyether, the first monomer, the second monomer, silicone oil, the catalyst and deionized water are determined according to their weight proportions; the raw materials are flowed into the stirring chamber of the sponge foaming machine according to the formula ratio, stirred at high speed, and flowed into the sponge foaming production line to foam to form a sponge, thereby obtaining the high tear strength and high resilience sponge.

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