Waste silicon rubber reduction method and preparation method thereof

Abstract

The invention discloses a waste silicon rubber reduction and preparation method. The method comprises the following steps: (1) crushing waste silicon rubber by using a crusher to generate waste silicon rubber fragments; (2) carrying out swelling activation on the waste silica gel fragments by using a solvent; (3) adding a silica gel polymeric material in a proper proportion, and matching with granulation in a waste silicone rubber recovery process to obtain a better recovery addition proportion; (4) carrying out machining, carrying out calendering damage on a roller by using a minimum gap until a sheet is formed, then adding vinyl, carrying out uniform mulling, and finally, adding a monomer, and carrying out mulling; (5) granulating by matching with mixing equipment; (6) generating a silica gel polymeric material, and uniformly mixing the silica gel polymeric material on a double-roller machine table; and (7) molding by using a mold, and putting the weighed silica gel polymeric material into the mold for molding, so that the recycled silicone rubber can be polymerized and vulcanized again, and green and sustainable development of the silicone rubber is realized.

Description

Technical Field

[0001] The invention relates to the technical field of waste silicone rubber restoration, in particular to waste silicone rubber restoration and a preparation method thereof. Background Art

[0002] In the polymerization reaction, there is a thermodynamic balance between dimethyl carbonate DMC and the polymer, which can swell and activate polydimethylsiloxane PDMS in waste rubber into DMC in acidic and alkaline solvents, and remove it from the reaction process to convert silica gel into DMC. Based on this principle, the current swelling activation is divided into two swelling methods: acidic and alkaline solvents.

[0003] The use of alkaline solvents can be used as a method for swelling waste silica gel to recover DMC. Among the most widely used alkaline solvents, potassium hydroxide (KOH) is the most commonly used solvent for swelling waste silica gel to recover DMC. When KOH is used, the obtained DMC is of high quality and the equipment corrosion rate is low, but it is not recommended from the perspective of production efficiency.

[0004] The use of acidic solvents as a method for swelling waste silica gel to recover DMC is currently a commonly used processing method. Although it is milder than the alkaline solvent method in terms of processing and relatively safe in production, the equipment corrosion rate is high, the quality of the DMC obtained is extremely unstable, and the quality of production is affected. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to solve the deficiencies in the prior art and provide a method for reducing waste silicone rubber and preparing the same.

[0006] Technical solution: including the following steps:

[0007] (1) Using a pulverizer to pulverize waste silicone rubber to generate waste silicone fragments, making the waste silicone fragments as small as possible;

[0008] (2) using a solvent to swell and activate the waste silica gel fragments;

[0009] (3) Adding an appropriate proportion of silicone polymer material, combined with the granulation of the waste silicone rubber recycling process, to obtain a better recycling and adding ratio, taking out the silicone powder particles used for the recycling reaction and putting them into a beaker, then putting the silicone polymer material in and stirring evenly until each rubber particle is formed, and then placing it at room temperature to stand;

[0010] (4) Mechanical processing, rolling the rollers to the minimum gap to crush until the sheet is formed, then adding vinyl to mix evenly, and finally adding monomers to mix;

[0011] (5) Use mixing equipment to granulate;

[0012] (6) adding appropriate proportions of silicone recycled particles, demoulding aid, bridging agent, i.e., blocked water-based curing agent, and color glue to generate silicone polymer material, and the silicone polymer material is evenly mixed on a double roller machine;

[0013] (7) Use mold molding, weigh the silicone polymer material and put it into the mold for molding.

[0014] A further improvement of the present invention is that the solvent comprises DHF, chloroform, ethyl acetate, THF.

[0015] A further improvement of the present invention is that the waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 800g of solvent DHF is put into a reaction axe, 50g of waste silica gel fragments are added, the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed and dispersed by hand, and then DHF is cut off from the sulfur, the temperature is increased to 60 degrees Celsius, and the desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is 45 degrees Celsius to drive out the remaining DHF again, and after 1 hour, dry silica gel powder A can be obtained.

[0016] A further improvement of the present invention is that the waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 800g of solvent chloroform is put into the reaction axe, 50g of waste silica gel fragments are added, the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed and dispersed by hand, and then the chloroform is used to break the sulfur, the temperature is increased to 60 degrees Celsius, the desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains, and the oven temperature is set at 45 degrees Celsius to drive out the remaining chloroform again. After 1 hour, dry silica gel powder B can be obtained.

[0017] A further improvement of the present invention is that the waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 800g of ethyl acetate is put into a reaction axe, 50g of waste silica gel fragments are added, the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed and dispersed by hand, and then the ethyl acetate is used to cut the sulfur, the temperature is increased to 60 degrees Celsius, and the desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is 45 degrees Celsius to drive out the remaining ethyl acetate again, and after 1 hour, dry silica gel powder C can be obtained.

[0018] A further improvement of the present invention is that the waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 800g of solvent THF is put into the reaction axe, 50g of waste silica gel fragments are added, the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed and dispersed by hand, and then THF is used to desulfurize, the temperature is increased to 60 degrees Celsius, and the desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining THF again. After 1 hour, dry silica gel powder D can be obtained.

[0019] A further improvement of the present invention is that the waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 400g of solvent DHF is put into a reaction axe, 50g of waste silica gel fragments are added, the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed and dispersed by hand, and then DHF is cut off from the sulfur, the temperature is increased to 60 degrees Celsius, and the desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is 45 degrees Celsius to drive out the remaining DHF again, and after 1 hour, dry silica gel powder F can be obtained.

[0020] A further improvement of the present invention is that the sulfur-containing waste silica gel is crushed into 120 mesh, 50g of solvent methanol is put into the reaction axe, 50g of sulfur-containing waste silica gel is added, the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed apart and dispersed by hand, thereby obtaining dry silica gel powder E.

[0021] A further improvement of the present invention is that in step (3), the silicone polymer material includes polydimethylsiloxane (PDMS), vinyl and alkyl silicone oils; in step (5), the mixing equipment includes a twin-screw extruder, a machine mixing system, and a conical twin-screw extruder.

[0022] A further improvement of the present invention is that in step (7), the temperature of the silicone polymer material when it is placed in the mold for molding is maintained at 170 degrees, and the pressure of the silicone polymer material when it is placed in the mold for molding reaches 60psi and is maintained for 300 seconds.

[0023] Compared with the prior art, the present invention provides a method for reducing waste silicone rubber and preparing the same, which at least achieves the following beneficial effects:

[0024] The present invention can restore waste silicone rubber, and can be polymerized and reused again, and can retain more than 70% of the physical properties before treatment, can improve the reuse rate of waste silicone rubber, and has a high cycle life. The waste silicone rubber can be restored and recycled through a reasonable and efficient method, which can not only reduce the impact of waste silicone rubber on the environment, but also can alleviate the current severe domestic demand for upstream raw materials of organic silicon to a great extent, thereby realizing the green and sustainable development of the organic silicon industry. DETAILED DESCRIPTION

[0025] Various exemplary embodiments of the present invention are now described in detail. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. The following description of at least one exemplary embodiment is actually only illustrative and is not intended to be any limitation on the present invention and its application or use.

[0026] The techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and devices should be considered as part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0027] A method for reducing and preparing waste silicone rubber comprises the following steps:

[0028] (1) Using a pulverizer to pulverize waste silicone rubber to generate waste silicone fragments, making the waste silicone fragments as small as possible;

[0029] (2) using a solvent to swell and activate the waste silica gel fragments;

[0030] (3) Adding an appropriate proportion of silicone polymer material, combined with the granulation of the waste silicone rubber recycling process, to obtain a better recycling and adding ratio, taking out the silicone powder particles used for the recycling reaction and putting them into a beaker, then putting the silicone polymer material in and stirring evenly until each rubber particle is formed, and then placing it at room temperature to stand;

[0031] (4) Mechanical processing, rolling the rollers to the minimum gap to crush until the sheet is formed, then adding vinyl to mix evenly, and finally adding monomers to mix;

[0032] (5) Use mixing equipment to granulate;

[0033] (6) adding appropriate proportions of silicone recycled particles, demoulding aid, bridging agent, i.e., blocked water-based curing agent, and color glue to generate silicone polymer material, and the silicone polymer material is evenly mixed on a double roller machine;

[0034] (7) Use mold molding, weigh the silicone polymer material and put it into the mold for molding.

[0035] A further improvement of the present invention is that in step (2), the solvent includes DHF, chloroform, ethyl acetate, THF.

[0036] Embodiment 1:

[0037] Waste silica gel fragments containing peroxide or platinum bridges are crushed to 120 meshes. The crushing is carried out using a crusher of Qiaolong Machinery, model: CL-G. 800g of solvent DHF is put into the reaction axe, and 50g of waste silica gel fragments are added. The temperature is heated to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed apart and dispersed by hand. After that, DHF is desulfurized and the temperature is raised to 60 degrees Celsius. The desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining DHF again. After 1 hour, dry silica gel powder A can be obtained, as shown in Table 1.

[0038] After taking out the silica gel powder A and putting it into a beaker, add the PDMS according to the proportion of content in Table 2, stir evenly until each particle is loose, and then place it at room temperature for 30 minutes, and then perform mechanical processing, use the roller to the minimum gap to calender and destroy it until it becomes a sheet, then add vinyl to mix evenly, and finally add the monomer to mix.

[0039] Embodiment 2:

[0040] Waste silica gel fragments containing peroxide or platinum bridges are crushed to 120 meshes. The crusher of Qiaolong Machinery, model: CL-G, is used for crushing. 800g of solvent chloroform is put into the reaction axe, and 50g of waste silica gel fragments are added. The temperature is heated to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed and dispersed by hand. Then, chloroform is used to cut off the sulfur, and the temperature is raised to 60 degrees Celsius. The desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining chloroform again. After 1 hour, dry silica gel powder B can be obtained, as shown in Table 1.

[0041] After taking out the silica gel powder B and putting it into the beaker, add the PDMS according to the proportion of content in Table 2, stir evenly until each particle is loose, and then place it at room temperature for 30 minutes, and then perform mechanical processing, use the roller to the minimum gap to calender and destroy it until it becomes a sheet, then add vinyl to mix evenly, and finally add the monomer to mix.

[0042] Embodiment 3:

[0043] Waste silica gel fragments containing peroxide or platinum bridges are crushed to 120 meshes. The crushing is carried out using a crusher of Qiaolong Machinery, model: CL-G. 800g of ethyl acetate is placed in a reaction axe, and 50g of waste silica gel fragments are added. The temperature is heated to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed apart and dispersed by hand. After that, ethyl acetate is used to cut off the sulfur, and the temperature is raised to 60 degrees Celsius. The desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining ethyl acetate again. After 1 hour, dry silica gel powder C can be obtained, as shown in Table 1.

[0044] After taking out the silica gel powder C and putting it into a beaker, add the PDMS content according to the proportion in Table 2, stir evenly until each particle is loose, and then place it at room temperature for 30 minutes, and then perform mechanical processing, use the roller to the minimum gap to calender and destroy it until it becomes a sheet, then add vinyl to mix evenly, and finally add the monomer to mix.

[0045] Embodiment 4:

[0046] Waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 800g solvent THF is put into the reaction axe, 50g waste silica gel fragments are added, and the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed and dispersed by hand. Then THF is used to desulfurize, the temperature is increased to 60 degrees Celsius, and the desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining THF again. After 1 hour, dry silica gel powder D can be obtained, as shown in Table 1.

[0047] After taking out the silica gel powder D and putting it into a beaker, add the PDMS according to the proportion of content in Table 2, stir evenly until each particle is loose, and then place it at room temperature for 30 minutes, and then perform mechanical processing, use the roller to the minimum gap to calender and destroy it until it becomes a sheet, then add vinyl and mix evenly, and finally add the monomer and mix.

[0048] Embodiment 5:

[0049] Waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 400g solvent DHF is put into the reaction axe, 50g waste silica gel fragments are added, and the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed and dispersed by hand. Then DHF is used to desulfurize, the temperature is increased to 60 degrees Celsius, and the desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining DHF again. After 1 hour, dry silica gel powder F can be obtained, as shown in Table 1.

[0050] After taking out the silica gel powder F and putting it into a beaker, add the PDMS content according to the proportion in Table 2, stir evenly until each particle is loose, and then place it at room temperature for 30 minutes, and then perform mechanical processing, use the roller to the minimum gap to calender and destroy it until it becomes a sheet, then add vinyl to mix evenly, and finally add the monomer to mix.

[0051] Embodiment 6:

[0052] The sulfur-containing waste silica gel was crushed into 120 mesh, 50g of solvent methanol was put into the reaction axe, and 50g of sulfur-containing waste silica gel was added. The temperature was heated to 50 degrees Celsius and the reaction time was continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles were confirmed every hour until they could be pushed apart and dispersed by hand, and dry silica gel powder E was obtained, see Table 1.

[0053] After taking out the silica gel powder E and putting it into a beaker, add the PDMS according to the proportion of content in Table 2, stir evenly until each particle is loose, and then place it at room temperature for 30 minutes, and then perform mechanical processing, use the roller to the minimum gap to calender and destroy it until it becomes a sheet, then add vinyl to mix evenly, and finally add the monomer to mix.

[0054] Table 1:

[0055]

[0056]

[0057] Table 2:

[0058]

[0059] A further improvement of the present invention is that in step (3), the silicone polymer material includes polydimethylsiloxane (PDMS), vinyl and alkyl silicone oils; in step (5), the mixing equipment includes a twin-screw extruder, a machine mixing system, and a conical twin-screw extruder.

[0060] A further improvement of the present invention is that in step (7), the temperature of the silicone polymer material when it is placed in the mold for molding is maintained at 170 degrees, and the pressure of the silicone polymer material when it is placed in the mold for molding reaches 60psi and is maintained for 300 seconds.

[0061] The performance parameters of the silica gel powder obtained in Examples 1-6 are shown in Table 3:

[0062]

[0063] In summary, the waste silicone rubber reduction and preparation method provided by the present invention can reduce the waste silicone rubber, and can be polymerized and reused, and can retain more than 70% of the physical properties before treatment, can improve the reuse rate of waste silicone rubber, and has a high cycle life. By reducing and recycling waste silicone rubber in a reasonable and efficient way, not only can the impact of waste silicone rubber on the environment be reduced, but also the current severe domestic demand for upstream raw materials of silicone can be alleviated to a great extent, thereby realizing the green and sustainable development of the silicone industry.

[0064] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A method for reducing waste silicone rubber and preparing the same, characterized in that: The following steps are involved: (1) Using a pulverizer to pulverize waste silicone rubber to generate waste silicone fragments, making the waste silicone fragments as small as possible; (2) using a solvent to swell and activate the waste silica gel fragments; (3) Adding an appropriate proportion of silicone polymer material, combined with the granulation of the waste silicone rubber recycling process, to obtain a better recycling and adding ratio, taking out the silicone powder particles used for the recycling reaction and putting them into a beaker, then putting the silicone polymer material in and stirring evenly until each rubber particle is formed, and then placing it at room temperature to stand; (4) Mechanical processing, rolling the rollers to the minimum gap to crush until the sheet is formed, then adding vinyl to mix evenly, and finally adding monomers to mix; (5) Use mixing equipment to granulate; (6) adding appropriate proportions of silicone recycled particles, demoulding aid, bridging agent, i.e., blocked water-based curing agent, and color glue to generate silicone polymer material, and the silicone polymer material is evenly mixed on a double roller machine; (7) Use mold molding, weigh the silicone polymer material and put it into the mold for molding.

2. The method for reducing and preparing waste silicone rubber according to claim 1, characterized in that: In the step (2), the solvent includes DHF, chloroform, ethyl acetate, and THF.

3. The method for reducing and preparing waste silicone rubber according to claim 2, characterized in that: Waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 800g solvent DHF is put into the reaction axe, 50g waste silica gel fragments are added, and the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed apart and dispersed by hand. Then DHF is used to desulfurize, the temperature is increased to 60 degrees Celsius, and the desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining DHF again. After 1 hour, dry silica gel powder A can be obtained.

4. The method for reducing and preparing waste silicone rubber according to claim 2, characterized in that: Waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 800g solvent chloroform is put into the reaction axe, 50g waste silica gel fragments are added, and the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed apart and dispersed by hand. Then, chloroform is used to cut off the sulfur, and the temperature is increased to 60 degrees Celsius. Desulfurization is carried out at a constant temperature for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining chloroform again. After 1 hour, dry silica gel powder B can be obtained.

5. The method for reducing and preparing waste silicone rubber according to claim 2, characterized in that: Waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 800g ethyl acetate is put into the reaction axe, 50g waste silica gel fragments are added, and the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed apart and dispersed by hand. After that, the ethyl acetate is used to cut off the sulfur, and the temperature is increased to 60 degrees Celsius. The desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining ethyl acetate again. After 1 hour, dry silica gel powder C can be obtained.

6. The method for reducing and preparing waste silicone rubber according to claim 2, characterized in that: Waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 800g solvent THF is put into the reaction axe, 50g waste silica gel fragments are added, and the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed apart and dispersed by hand. Then THF is used to desulfurize, the temperature is raised to 60 degrees Celsius, and the desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining THF again. After 1 hour, dry silica gel powder D can be obtained.

7. The method for reducing and preparing waste silicone rubber according to claim 2, characterized in that: Waste silica gel fragments containing peroxide or platinum bridge are crushed to 120 mesh, 400g solvent DHF is put into the reaction axe, 50g waste silica gel fragments are added, and the temperature is increased to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed and dispersed by hand. After that, DHF is used to cut off the sulfur, and the temperature is increased to 60 degrees Celsius. The desulfurization temperature is maintained for 4 to 6 hours until a trace amount remains. The oven temperature is set at 45 degrees Celsius to drive out the remaining DHF again. After 1 hour, dry silica gel powder F can be obtained.

8. The method for reducing and preparing waste silicone rubber according to claim 2, characterized in that: The sulfur-containing waste silica gel material is crushed into 120 mesh, 50g of solvent methanol is put into the reaction axe, and 50g of sulfur-containing waste silica gel material is added. The temperature is heated to 50 degrees Celsius and the reaction time is continued for 4 to 6 hours. During this process, the temperature in the tank and the softening degree of the sulfur-containing rubber particles are confirmed every hour until they can be pushed apart and dispersed by hand, and dry silica gel powder E is obtained.

9. The method for reducing and preparing waste silicone rubber according to claim 1, characterized in that: In the step (3), the silicone polymer material includes polydimethylsiloxane (PDMS), vinyl and alkyl silicone oils. In the step (5), the mixing equipment includes a twin-screw extruder, a machine mixing system and a conical twin-screw extruder.

10. The method for reducing and preparing waste silicone rubber according to claim 1, characterized in that: In the step (7), the temperature of the silicone polymer material when it is placed in the mold for molding is maintained at 170 degrees, and the pressure of the silicone polymer material when it is placed in the mold for molding reaches 60psi and is maintained for 300 seconds.

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