Coordination vulcanized organic silicon rubber foaming material and preparation and recycling method thereof

Abstract

The invention relates to a coordinated vulcanized organic silicon rubber foaming material and a preparation and recycling method thereof, and belongs to the technical field of polymer foaming material preparation. The organic silicon rubber is modified through reaction of-N-H in an imidazole group on the modifier and vinyl-C = C-in the organic silicon rubber, and N in imidazole can provide electrons and can be combined with metal ions in the compounding agent to form coordinate bonds. The coordination bond has temperature sensitivity, vulcanization crosslinking of the organic silicon rubber is achieved through the coordination bond, and the body strength needed by foaming is matched. After the organic silicon rubber is foamed, gas in original foam holes is removed through high temperature and vacuum pumping, rubber components on the walls of the original foam holes are in contact with one another, coordinate bonds can be formed again, and an unfoamed organic silicon rubber material is obtained. The unfoamed organic silicon rubber material can be foamed again through a supercritical fluid foaming technology. The purpose of foaming again after the organic silicon foaming material is recycled is achieved.

Description

Technical Field

[0001] The invention relates to a coordinated vulcanized organic silicon rubber foam material and a preparation and recycling method thereof, belonging to the technical field of polymer foam material preparation. Background Art

[0002] At present, the traditional physical foaming method of silicone rubber is to add water-soluble solid particles (such as sodium chloride, ammonium chloride, urea, glucose and other small molecules) or expandable microspheres to the silicone rubber. After the silicone rubber is completely vulcanized, water is used as a solvent to dissolve and remove the solid particles in the system, or the hydrocarbons inside the heat-expandable microspheres are heated to the boiling point and then rapidly vaporize and expand, thereby preparing a small-pore closed-cell material. The traditional chemical foaming method of silicone rubber is to pre-vulcanize the silicone rubber to give it a certain strength, decompose and foam it through a chemical foaming agent, and then a secondary vulcanization process is required to fully cross-link the foaming material to ensure the stability of the pore morphology and size.

[0003] Whether it is a silicone rubber foam material prepared by physical foaming or chemical foaming, it needs to be cross-linked to ensure the stability of its pore morphology and size. As we all know, cross-linked polymers are polymers with a three-dimensional network structure, which are insoluble, non-meltable, and non-plastic processable. This results in the silicone rubber foam materials currently on the market not being recyclable or even reprocessed and foamed. With the continuous expansion of the application scenarios of silicone rubber foam materials and the year-on-year growth in consumption, in the near future, it will inevitably bring a very serious problem to mankind: how to deal with these discarded silicone rubber foam materials? In view of the above-mentioned defects, the present invention aims to create a coordinated vulcanized organic silicon rubber foam material and a preparation and recycling method thereof, so as to make it more valuable for industrial use. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a coordinated vulcanized organic silicon rubber foam material and a preparation and recycling method thereof.

[0005] The coordinated vulcanized organic silicon rubber foam material of the present invention comprises the following raw materials in parts by weight: 100 parts of silicone rubber; 0.5-10 parts of modifier; 5-50 parts of white carbon black; 0.5-2 parts of processing aids; 0.1 to 10 parts of compounding agent; The organic silicone rubber is one or more of methyl vinyl silicone rubber, phenyl vinyl silicone rubber, trifluoromethyl vinyl silicone rubber, and methyl phenyl vinyl silicone rubber; The vinyl content of the silicone rubber is 0.05% to 1%; the molecular weight is 300,000 to 700,000; The modifier is one or more of imidazole, 1-methylimidazole, dimethylimidazole, diethyltetramethylimidazole, benzimidazole, diphenylimidazole, and 1H-imidazo[1,2-B]pyrazole; The white carbon black is white carbon black prepared by a gas phase method and / or a precipitation method, and has an average particle size of 4 to 30 μm; The processing aid is hydroxy silicone oil with a viscosity of 50~700cSt; The complexing agent is one or more of cuprous bromide, cuprous iodide, cupric acetate, ferric chloride, ferrous bromide, zinc chloride and zinc nitrate.

[0006] Furthermore, the molar ratio of the modifier to the compounding agent is 1:1-1.1.

[0007] Furthermore, the molar ratio of the vinyl group in the silicone rubber to the imidazole group in the modifier is 1-1.2:1.

[0008] A method for preparing a coordinated vulcanized silicone rubber foam material, the specific preparation steps are: (1) Dissolve 100 parts by weight of an organic silicone rubber having a vinyl content of 0.05% to 1% and a molecular weight of 300,000 to 700,000 in tetrahydrofuran, add an appropriate amount of a basic catalyst triethylamine, and then add 0.5 to 10 parts of a modifier, react for 11 to 13 hours, remove the solvent, wash, and dry to obtain a modified organic silicone rubber; (2) Add 5 to 50 parts of white carbon black and 0.5 to 2 parts of a processing aid to the modified silicone rubber, and knead the mixture in an internal mixer at 55 to 65° C. and a speed of 55 to 65 r / min for 12 to 18 minutes; add 0.1 to 10 parts of a compounding agent to the kneaded material, and knead the mixture at room temperature to obtain a mixed rubber; (3) The rubber mixture is filled into a mold, and the laminator is set at 125-135°C and treated at a pressure of 7 MPa for 5 min. The sample is then placed in a supercritical fluid foaming device, and 20 MPa of nitrogen is introduced into the device. The foaming temperature is set to 48-52°C. After sufficient impregnation, the pressure is released and foamed at a rate of 5 MPa / S to obtain a coordinated vulcanized silicone rubber foam material.

[0009] Furthermore, the coordinated vulcanized silicone rubber foaming material can be subjected to supercritical fluid foaming again after being processed by a recycling process.

[0010] A method for recycling a coordinated vulcanized organosilicon rubber foam material, the specific recycling steps are: The coordinated vulcanized organic silicone rubber foam material is crushed and placed in a limiting mold, raised to a required temperature, and evacuated to obtain an unfoamed organic silicone rubber material; The temperature is 140-170°C; The vacuum degree is 0.05~0.1MPa.

[0011] By means of the above scheme, the present invention has at least the following advantages: 1. The present invention achieves modification of the silicone rubber by reacting the -NH in the imidazole group on the modifier with the vinyl -C=C in the silicone rubber. The modification principle is as follows: Figure 1 As shown in the figure, imidazole reacts with carbon-carbon double bonds. The modification effect is to connect the imidazole modifier to the silicone rubber molecular chain through this reaction, so that it has a donor that can provide a lone pair of electrons. It is used to coordinate with the transition metal later to form a coordination bond. The coordination form is as follows Figure 2 As shown; Compared with covalent bonds, coordination bonds are essentially a reversible intermolecular interaction. When the coordination bond is destroyed, after a certain temperature treatment, the metal ions and ligands will contact each other and re-form the coordination bond. The effect of the coordination bond vulcanization in the present invention is equivalent to the covalent bond vulcanization in the traditional rubber vulcanization, but the covalent bond vulcanization is irreversible and cannot be recycled or foamed for secondary processing. However, coordination vulcanization is reversible and temperature sensitive. By adjusting the temperature, the conditions for the re-formation of coordination bonds are achieved, and the foamed rubber can be recycled and foamed again. In the recycling process, the foamed silicone rubber is evacuated to discharge the gas in the original pores, so that the pore walls that were originally not in contact with each other are in contact with each other, and then the coordination bonds are re-formed by adjusting the temperature. The recycled silicone foam material will return to the unfoamed state, realizing the recycling of the foamed material. With the help of supercritical fluid foaming technology, foaming can be achieved again.

[0012] 2. The coordination-vulcanized silicone rubber foam material of the present invention is the same as the TPU foam material, and the bulk strength needs to reach a certain level to maintain the cell morphology. The principle of the present invention can achieve the purpose by adjusting the parameters such as the modifier, the metal compounding agent, and the vinyl content in the silicone rubber. The present invention can achieve the vulcanization crosslinking of the silicone rubber through the coordination bond to match the bulk strength required for foaming.

[0013] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show a certain embodiment of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 This is a modification principle diagram of the present invention for modifying the organic silicon rubber; Figure 2 Schematic diagram of the coordination form of the coordination bond of the modified organic silicone rubber of the present invention; Figure 3 is an electron microscope photograph of the foamed organic silicone rubber material prepared in Example 1 of the present invention; Figure 4 is an electron microscope photograph of the foamed organic silicone rubber material prepared in Example 2 of the present invention; Figure 5 is an electron microscope photograph of the foamed organic silicone rubber material prepared in Example 3 of the present invention; Figure 6 is an electron microscope photograph of the foamed silicone rubber material prepared in Comparative Example 3 of the present invention; Figure 7 is an electron microscope photograph of the foamed silicone rubber material prepared in Comparative Example 4 of the present invention; Figure 8 This is an electron microscope photograph of the foamed silicone rubber material prepared in Comparative Example 6 of the present invention. DETAILED DESCRIPTION

[0016] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0017] (1) Dissolve 100 parts by weight of an organic silicone rubber having a vinyl content of 0.05% to 1% and a molecular weight of 300,000 to 700,000 in tetrahydrofuran, add an appropriate amount of a basic catalyst triethylamine, and then add 0.5 to 10 parts of a modifier, react for 11 to 13 hours, remove the solvent, wash, and dry to obtain a modified organic silicone rubber; The organic silicone rubber is one or more of methyl vinyl silicone rubber, phenyl vinyl silicone rubber, trifluoromethyl vinyl silicone rubber, and methyl phenyl vinyl silicone rubber; The modifier is one or more of imidazole, 1-methylimidazole, dimethylimidazole, diethyltetramethylimidazole, benzimidazole, diphenylimidazole, and 1H-imidazo[1,2-B]pyrazole; The molar ratio of the vinyl group in the organic silicone rubber to the imidazole group in the modifier is 1-1.2:1.

[0018] (2) Add 5 to 50 parts of white carbon black and 0.5 to 2 parts of a processing aid to the modified silicone rubber, and knead the mixture in an internal mixer at 55 to 65° C. and a speed of 55 to 65 r / min for 12 to 18 minutes; add 0.1 to 10 parts of a compounding agent to the kneaded material, and knead the mixture at room temperature to obtain a mixed rubber; The white carbon black is white carbon black prepared by a gas phase method and / or a precipitation method, and has an average particle size of 4 to 30 μm; The processing aid is hydroxy silicone oil with a viscosity of 50~700cSt; The complexing agent is one or more of cuprous bromide, cuprous iodide, cupric acetate, ferric chloride, ferrous bromide, zinc chloride and zinc nitrate.

[0019] The molar ratio of the modifier to the compounding agent is 1:1~1.1; (3) The mixed rubber is filled into a mold, and the laminator is set at 125-135°C and treated at a pressure of 7 MPa for 5 min; then the sample is placed in a supercritical fluid foaming device, and 20 MPa of nitrogen is introduced into the device, and the foaming temperature is set to 48-52°C. After sufficient impregnation, the pressure is released and foamed at a rate of 5 MPa / S to obtain a silicone rubber foam material A; (4) After the silicone rubber foam material A is crushed, it is placed in a limiting mold, the temperature is raised to 160-170°C, and the vacuum degree is reduced to 0.1 MPa to obtain unfoamed silicone rubber B; then the silicone rubber B is placed in a supercritical fluid foaming device, and 20 MPa of nitrogen is introduced into the device. The foaming temperature is set to 48-52°C. After sufficient impregnation, the pressure is released and foamed at a rate of 5 MPa / S to obtain silicone rubber foam material C.

[0020] Example 1 (1) By weight, 100 parts of methyl vinyl silicone rubber with a vinyl content of 0.5% and a molecular weight of 300,000 are dissolved in tetrahydrofuran, an appropriate amount of alkaline catalyst triethylamine is added, and then 0.5 parts of a modifier dimethylimidazole is added. After reacting for 11 hours, the solvent is removed, washed, and dried to obtain a modified silicone rubber; the molar ratio of the vinyl group in the silicone rubber to the imidazole group in the modifier is 1:1.

[0021] (2) Add 5 parts of fumed silica with an average particle size of 30 μm and 0.5 parts of hydroxy silicone oil with a viscosity of 50 cSt as a processing aid to the modified silicone rubber, and knead the mixture in an internal mixer at 55° C. and a speed of 55 r / min for 12 min; add 0.5 parts of cuprous bromide as a compounding agent to the kneaded material, and knead the mixture at room temperature to obtain a rubber compound; the molar ratio of the modifier to the compounding agent is 1:1; (3) The mixed rubber is filled into a mold, and the laminator is set at 130°C and treated at a pressure of 7 MPa for 5 min; then the sample is placed in a supercritical fluid foaming device, and 20 MPa of nitrogen is introduced into the device. The foaming temperature is set to 50°C, and after sufficient impregnation, the pressure is released and foamed at a rate of 5 MPa / S to obtain a silicone rubber foam material A; (4) After the silicone rubber foam material A is crushed, it is placed in a limiting mold, the temperature is raised to 165°C, and the vacuum degree is reduced to 0.1 MPa to obtain unfoamed silicone rubber B; then the silicone rubber B is placed in a supercritical fluid foaming device, and 20 MPa of nitrogen is introduced into the device. The foaming temperature is set to 48°C. After sufficient impregnation, the pressure is released and foamed at a rate of 5 MPa / S to obtain silicone rubber foam material C.

[0022] Example 2 (1) By weight, 100 parts of methyl vinyl silicone rubber with a vinyl content of 0.5% and a molecular weight of 300,000 are dissolved in tetrahydrofuran, an appropriate amount of alkaline catalyst triethylamine is added, and then 0.45 parts of a modifier dimethylimidazole are added. After reacting for 12 hours, the solvent is removed, washed, and dried to obtain a modified silicone rubber; the molar ratio of the vinyl group in the silicone rubber to the imidazole group in the modifier is 1.1:1.

[0023] (2) Add 35 parts of fumed silica with an average particle size of 25 μm and 1.5 parts of hydroxy silicone oil with a viscosity of 350 cSt as a processing aid to the modified silicone rubber, and knead the mixture in an internal mixer at 60° C. and a speed of 60 r / min for 15 min; add 0.5 parts of cuprous bromide as a compounding agent to the kneaded material, and knead the mixture at room temperature to obtain a rubber compound; the molar ratio of the modifier to the compounding agent is 1:1.1; (3) The mixed rubber is filled into a mold, and the laminator is set at 130°C and treated at a pressure of 7 MPa for 5 min; then the sample is placed in a supercritical fluid foaming device, and 20 MPa of nitrogen is introduced into the device. The foaming temperature is set to 50°C, and after sufficient impregnation, the pressure is released and foamed at a rate of 5 MPa / S to obtain a silicone rubber foam material A; (4) After the silicone rubber foam material A is crushed, it is placed in a limiting mold, the temperature is raised to 165°C, and the vacuum degree is reduced to 0.1 MPa to obtain unfoamed silicone rubber B; then the silicone rubber B is placed in a supercritical fluid foaming device, and 20 MPa of nitrogen is introduced into the device. The foaming temperature is set to 50°C. After sufficient impregnation, the pressure is released and foamed at a rate of 5 MPa / S to obtain silicone rubber foam material C.

[0024] Example 3 (1) By weight, 100 parts of methyl vinyl silicone rubber with a vinyl content of 0.5% and a molecular weight of 300,000 are dissolved in tetrahydrofuran, an appropriate amount of alkaline catalyst triethylamine is added, and then 0.42 parts of a modifier dimethylimidazole are added. After reacting for 13 hours, the solvent is removed, washed, and dried to obtain a modified silicone rubber; the molar ratio of the vinyl group in the silicone rubber to the imidazole group in the modifier is 1.2:1.

[0025] (2) Add 50 parts of fumed silica with an average particle size of 30 μm and 2 parts of hydroxy silicone oil with a viscosity of 700 cSt as a processing aid to the modified silicone rubber, and knead the mixture in an internal mixer at 65°C and a speed of 65 r / min for 18 min; add 0.46 parts of cuprous bromide as a compounding agent to the internal mixer, and knead the mixture at room temperature to obtain a rubber compound; the molar ratio of the modifier to the compounding agent is 1:1.1; (3) The mixed rubber was filled into a mold, and the laminator was set at 135°C and treated at a pressure of 7 MPa for 5 min; then the sample was placed in a supercritical fluid foaming device, and 20 MPa of nitrogen was introduced into the device. The foaming temperature was set to 52°C, and after sufficient impregnation, the pressure was released and foamed at a rate of 5 MPa / S to obtain a silicone rubber foam material A; (4) After the silicone rubber foam material A is crushed, it is placed in a limiting mold, the temperature is raised to 170°C, and the vacuum degree is reduced to 0.1 MPa to obtain unfoamed silicone rubber B; then the silicone rubber B is placed in a supercritical fluid foaming device, and 20 MPa of nitrogen is introduced into the device. The foaming temperature is set to 52°C. After sufficient impregnation, the pressure is released and foamed at a rate of 5 MPa / S to obtain silicone rubber foam material C.

[0026] Comparison Example Comparative Example 1 The preparation methods of this comparative example and Example 1 of the present invention are basically the same, except that the organic silicone rubber is not modified by a modifier, and the other preparation steps remain unchanged, and the organic silicone rubber foam material cannot be prepared; Comparative Example 2 The preparation methods of this comparative example and Example 1 of the present invention are basically the same, except that no compounding agent is added, and other preparation steps remain unchanged, and the organic silicone rubber foam material cannot be prepared; Comparative Example 3 The preparation methods of this comparative example and Example 1 of the present invention are basically the same, except that the vinyl content is 0.5%, the molar ratio of the vinyl to the imidazole group in the modifier is 2:1, and the other preparation steps remain unchanged, and the organic silicone rubber foam material is also prepared; Comparative Example 4 The preparation methods of this comparative example and Example 1 of the present invention are basically the same, except that the vinyl content is 0.5%, the molar ratio of the modifier to the compounding agent is 1:3, and the other preparation steps remain unchanged, and the organic silicone rubber foam material is also prepared; Comparative Example 5 The preparation methods of this comparative example and Example 1 of the present invention are basically the same, except that the recovery temperature is 130 degrees, and the other preparation steps remain unchanged, and the organic silicone rubber foam material is prepared in the same manner; The performance of Examples 1-3 and Comparative Examples 1-3 of the present invention were tested respectively, and the test results are shown in Table 1: Comparative Example 6 (1) Add 50 parts of fumed silica with an average particle size of 30 μm, 2 parts of hydroxy silicone oil with a viscosity of 700 cSt as a processing aid, and 2 parts of a di-2,5 vulcanizer to 100 parts of methyl vinyl silicone rubber with a vinyl content of 0.5% and a molecular weight of 300,000 by weight, and mix in an internal mixer at 65°C and a speed of 65 r / min for 18 minutes; (2) The rubber mixture was filled into a mold, and the laminator was set at 135°C and treated at a pressure of 7 MPa for 5 min. The sample was then placed in a supercritical fluid foaming device, and 20 MPa of nitrogen was introduced into the device. The foaming temperature was set to 52°C, and after sufficient impregnation, the pressure was released and foamed at a rate of 5 MPa / S to obtain a silicone rubber foam material A. (3) After the silicone rubber foaming material A is crushed, it is placed in a limiting mold, the temperature is raised to 170°C, and the vacuum degree is reduced to 0.1 MPa. It is impossible to obtain unfoamed silicone rubber B; further, it is impossible to achieve re-foaming.

[0027] Detection method: Density test: Test according to the test conditions specified in ASTM D1056; Tensile strength test: Tested according to the test conditions specified in ASTM D412-16; 25% compressive stress test: The test was conducted according to the test conditions specified in ASTM D1056.

[0028] Table 1 Performance test results

[0029] Based on the test data in the above table and the attached Figure 3-5 It can be seen that the various performance test data of the products in Examples 1-3 of the present invention are very excellent, which can prove that the technical solution of the present application is highly feasible; Then, the performance of the control examples 1 and 2 was compared with that of the embodiment 1. Since the control examples 1 and 2 did not add the modifier and the metal compounding agent, the foaming material could not be obtained in the end. Comparative Example 6 uses ordinary covalent bond vulcanization instead of the coordination bond formation of the present invention, resulting in the final foaming material being unable to be recycled; This proves that the present invention achieves modification of the organic silicone rubber by reacting the -NH in the imidazole group on the modifier with the vinyl -C=C in the organic silicone rubber. The modification principle is as follows: Figure 1 As shown in the figure, imidazole reacts with carbon-carbon double bonds. The modification effect is to connect the imidazole modifier to the silicone rubber molecular chain through this reaction, so that it has a donor that can provide a lone pair of electrons. It is used to coordinate with the transition metal later to form a coordination bond. The coordination form is as follows Figure 2 As shown; relative to covalent bonds, coordination bonds are essentially a reversible intermolecular interaction. When the coordination bond is destroyed, after being treated at a certain temperature, the metal ions and ligands will contact each other and re-form the coordination bond, and the coordination bond is temperature sensitive. The effect of the coordination bond vulcanization in the present invention is equivalent to the covalent bond vulcanization in the traditional rubber vulcanization, but the covalent bond vulcanization is irreversible, and it is impossible to achieve recycling and secondary processing foaming. However, coordination vulcanization is reversible. By adjusting the temperature, the conditions for the re-formation of coordination bonds are reached, and the foamed rubber can be recycled and foamed again. In the recycling process, the foamed silicone rubber is evacuated to discharge the gas in the original pores, so that the pore walls that were originally not in contact with each other are in contact with each other, and then the coordination bonds are re-formed by adjusting the temperature, and the recycled silicone foam material will return to the unfoamed state, realizing the recycling of the foamed material, and with the help of supercritical fluid foaming technology, it can be re-foamed.

[0030] The performance of the comparative examples 3, 4, 5, 6 and the embodiment 1 of the present invention is compared, and combined with Figure 6 , 7 It can be seen that due to the lack of modifier and large dosage in Comparative Examples 3 and 4, the raw material parameter range is outside the specific ratio range of this application. The reuse temperature of reference example 5 is lower than the reuse temperature range of the present application, which results in the inability to realize reuse and the inability to realize the process of re-foaming. It can be confirmed that the coordination-vulcanized silicone rubber foam material of the present invention, like the TPU foam material, needs to reach a certain degree of bulk strength to maintain the cell morphology. The principle of the present invention can achieve the purpose by regulating and controlling the parameters such as the modifier, the metal compounding agent, and the vinyl content in the silicone rubber. The present invention enables the vulcanization cross-linking of the silicone rubber to be realized through the coordination bond, matching the bulk strength required for foaming.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A coordinated vulcanized silicone rubber foam material, characterized in that: The following raw materials are included by weight: 100 parts of silicone rubber; 0.5-10 parts of modifier; 5-50 parts of white carbon black; 0.5-2 parts of processing aids; 0.1 to 10 parts of compounding agent; The organic silicone rubber is one or more of methyl vinyl silicone rubber, phenyl vinyl silicone rubber, trifluoromethyl vinyl silicone rubber, and methyl phenyl vinyl silicone rubber; The silicone rubber has a vinyl content of 0.05% to 1% and a molecular weight of 300,000 to 700,000. The modifier is one or more of imidazole, 1-methylimidazole, dimethylimidazole, diethyltetramethylimidazole, benzimidazole, diphenylimidazole, and 1H-imidazo[1,2-B]pyrazole; The white carbon black is white carbon black prepared by a gas phase method and / or a precipitation method, and has an average particle size of 4 to 30 μm; The processing aid is hydroxy silicone oil with a viscosity of 50~700cSt; The complexing agent is one or more of cuprous bromide, cuprous iodide, cupric acetate, ferric chloride, ferrous bromide, zinc chloride and zinc nitrate.

2. The coordinated vulcanized silicone rubber foam material according to claim 1, characterized in that: The molar ratio of the modifier to the compounding agent is 1:1-1.

1.

3. The coordinated vulcanized silicone rubber foam material according to claim 1, characterized in that: The molar ratio of the vinyl group in the organic silicone rubber to the imidazole group in the modifier is 1-1.2:

1.

4. The method for preparing a coordinated vulcanized silicone rubber foam material according to claim 1, characterized in that The specific preparation steps are: (1) Dissolve 100 parts by weight of an organic silicone rubber having a vinyl content of 0.05% to 1% and a molecular weight of 300,000 to 700,000 in tetrahydrofuran, add an appropriate amount of a basic catalyst triethylamine, and then add 0.5 to 10 parts of a modifier, react for 11 to 13 hours, remove the solvent, wash, and dry to obtain a modified organic silicone rubber; (2) Add 5 to 50 parts of white carbon black and 0.5 to 2 parts of a processing aid to the modified silicone rubber, and knead the mixture in an internal mixer at 55 to 65° C. and a speed of 55 to 65 r / min for 12 to 18 minutes; add 0.1 to 10 parts of a compounding agent to the kneaded material, and knead the mixture at room temperature to obtain a mixed rubber; (3) The rubber mixture is filled into a mold, and the laminator is set at 125-135°C and treated at a pressure of 7 MPa for 5 min. The sample is then placed in a supercritical fluid foaming device, and 20 MPa of nitrogen is introduced into the device. The foaming temperature is set to 48-52°C. After sufficient impregnation, the pressure is released and foamed at a rate of 5 MPa / S to obtain a coordinated vulcanized silicone rubber foam material.

5. The coordinated vulcanized silicone rubber foam material according to claim 1, characterized in that: The coordinated vulcanized organic silicon rubber foaming material can be subjected to supercritical fluid foaming again after being processed by a recycling process.

6. The method for recycling a coordinated vulcanized silicone rubber foam material according to claim 1, characterized in that: The specific steps for recycling are: The coordinated vulcanized organic silicone rubber foam material is crushed and placed in a limiting mold, raised to a required temperature, and evacuated to obtain an unfoamed organic silicone rubber material; The temperature is 140-170°C; The vacuum degree is 0.05~0.1MPa.

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