Functional group lithiation of synthetic rubbers and methods and apparatuses for preparing

Abstract

This invention relates to the field of chemical new material production technology, specifically a method and apparatus for preparing functionalized lithium compounds for synthetic rubber. The preparation method includes: first, drying a required amount of organic amine and then diluting the dried organic amine with a first organic solvent to obtain an organic amine solution; second, dissolving a required amount of organic lithium in a second organic solvent to obtain an organic lithium solution; and third, mixing and reacting the organic amine solution and the organic lithium solution while simultaneously removing the heat of reaction to obtain the functionalized lithium compounds for synthetic rubber. This invention solves the problems of precipitation and wall adhesion caused by premature preparation of the organic amine lithium initiator, as well as the reduction in initiator activity, ensuring the normal production and stable quality of synthetic rubber products.

Description

Technical Field

[0001] This invention relates to the field of chemical new material production technology, specifically to a functionalized lithium compound for synthetic rubber, its preparation method, and preparation apparatus. Background Technology

[0002] Functionalized solution-polymerized styrene-butadiene rubber (SSBR) is a new product of single-chain terminal star-shaped amine-functionalized SSBR. Its preparation principle involves polymerization of organic monomers with lithium amine initiators, followed by silicon or tin coupling. The strong polarity of the organic amine promotes the dispersion of rubber and carbon black filler, while silicon or tin coupling improves the dispersion of silica in the rubber. For carbon black / silica dual-filler systems, amine-functionalized SSBR exhibits excellent balance in terms of high wet skid resistance, low rolling resistance, and high abrasion resistance.

[0003] The main existing production process for functionalized solution-polymerized styrene-butadiene rubber (SBR) involves first preparing organic amine and organolithium solutions, then adding them to a polymerization reactor. In the reactor, the organic amine and organolithium react to generate functionalized lithium compounds. These functionalized lithium compounds then polymerize with organic monomers, followed by silicon or tin coupling to form functionalized SBR. However, in this process, the activity of the functionalized lithium compounds as initiators is time-sensitive, primarily due to the delay in the preparation and addition of the organic amine and organolithium solutions. This leads to a decrease in the activity of the lithium compounds as initiators in the polymerization reactor, resulting in a low degree of functionality in the SBR product. Furthermore, according to experimental simulations, when preparing lithium amine initiators based on the N to Li atom ratio, a white precipitate appears and adheres to the reactor walls after 10 minutes of preparation. After 1 hour, the precipitation increases and stratification occurs. After 48 hours, the precipitation and adhesion to the walls become severe, further reducing the activity of the functionalized lithium compounds as initiators. This is detrimental to normal production and the initiation of polymerization reactions during synthetic rubber manufacturing.

[0004] Therefore, it is necessary to study a functionalized lithium compound for synthetic rubber and its preparation method, and to have facilities and pipelines for real-time preparation of functionalized lithium compounds before the polymerization reaction (synthetic rubber), so as to ensure that the functionalized lithium compounds, as initiators, maintain stable and high activity during the synthesis of functionalized solution-polymerized styrene-butadiene rubber, thereby improving the functionalization degree of the functionalized solution-polymerized styrene-butadiene rubber products. Summary of the Invention

[0005] This invention provides a functionalized lithium compound for synthetic rubber, as well as a preparation method and apparatus, which overcomes the shortcomings of the prior art and effectively solves the problem of low activity of the functionalized lithium compound (amine lithium initiator) in the preparation of functionalized solution-polymerized styrene-butadiene rubber.

[0006] One of the technical solutions of the present invention is achieved by the following measures: a functionalized lithium compound for synthetic rubber is prepared by the following method: First, after drying the required amount of organic amine, the dried organic amine is diluted with a first organic solvent to obtain an organic amine solution; Second, the required amount of organic lithium is dissolved in a second organic solvent to obtain an organic lithium solution; Third, the organic amine solution and the organic lithium solution are mixed and reacted, and the heat of reaction is removed simultaneously to obtain the functionalized lithium compound for synthetic rubber.

[0007] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: In the first step above, the organic amine is at least one of aliphatic amines, alcoholic amines, amides, alicyclic amines, aromatic amines, and naphthyl amines, and the first organic solvent is at least one of cyclopentane, cyclohexane, n-hexane, and toluene.

[0008] In the first step above, the mass concentration of the organic amine solution is 5% to 85%.

[0009] In the second step above, the organolithium is one of n-butyllithium, methyllithium, sec-butyllithium, tert-butyllithium, phenyllithium, and dilithium initiators, and the second organic solvent is at least one of cyclopentane, cyclohexane, and n-hexane.

[0010] In the second step above, the mass concentration of the organic lithium solution is 5% to 30%.

[0011] In the third step above, the molar ratio of N atoms to Li atoms in the functionalized lithium of the synthetic rubber is 0.05 to 0.95.

[0012] The second technical solution of the present invention is achieved through the following measures: a method for preparing functionalized lithium of synthetic rubber, comprising: first, drying a required amount of organic amine and diluting the dried organic amine with a first organic solvent to obtain an organic amine solution; second, dissolving a required amount of organic lithium in a second organic solvent to obtain an organic lithium solution; and third, mixing and reacting the organic amine solution and the organic lithium solution while simultaneously removing the heat of reaction to obtain functionalized lithium of synthetic rubber.

[0013] The third technical solution of the present invention is achieved through the following measures: a device for preparing functionalized lithium in synthetic rubber, comprising: an organolithium storage tank, an organoamine storage tank, an organoamine dehydration bed, an organoamine dilution tank, and a mixing reactor; an organolithium solution pipeline is fixedly connected between the outlet of the organolithium storage tank and the first inlet at the top of the mixing reactor; an organoamine dehydration pipeline is fixedly connected between the top outlet of the organoamine storage tank and the bottom inlet of the organoamine dehydration bed; an organoamine dilution pipeline is fixedly connected between the top outlet of the organoamine dehydration bed and the top inlet of the organoamine dilution tank; an organoamine solution pipeline is fixedly connected between the bottom outlet of the organoamine dilution tank and the second inlet at the top of the mixing reactor; a cooling liquid inlet pipeline is fixedly connected to the upper inlet of the mixing reactor; a circulating liquid outlet pipeline is fixedly connected to the lower outlet of the mixing reactor; and a functionalized lithium pipeline is fixedly connected to the bottom outlet of the mixing reactor.

[0014] The following are further optimizations and / or improvements to the third technical solution of the above invention: The aforementioned device also includes an inert gas storage tank, with a first inert gas pipeline fixedly connected between the outlet of the inert gas storage tank and the top inlet of the organic amine storage tank, and a second inert gas pipeline fixedly connected between the first inert gas pipeline and the organic amine dilution pipeline.

[0015] The aforementioned apparatus also includes a flushing solvent storage tank, with an organic lithium flushing pipeline fixedly connected between the outlet of the flushing solvent storage tank and the organic lithium solution pipeline, and an organic amine flushing pipeline fixedly connected between the organic lithium flushing pipeline and the organic amine solution pipeline.

[0016] The lithium functionalized group of synthetic rubber obtained by this invention, when used as an initiator for the synthesis of functionalized solution-polymerized styrene-butadiene rubber, can maintain stable and high initiator activity, and improve the functionalization degree of functionalized solution-polymerized styrene-butadiene rubber products, thus ensuring the normal production of synthetic rubber products and the stability of product quality. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram of the process flow structure of Embodiment 9 of the present invention.

[0018] Appendix Figure 2 This is a schematic diagram of the mixing reactor structure in Embodiment 9 of the present invention.

[0019] The codes in the attached diagram are as follows: 1 is the organic lithium storage tank, 2 is the organic amine storage tank, 3 is the organic amine dehydration bed, 4 is the organic amine dilution tank, 5 is the mixing reactor, 6 is the organic lithium solution pipeline, 7 is the organic amine dehydration pipeline, 8 is the organic amine dilution pipeline, 9 is the organic amine solution pipeline, 10 is the stirring device, 11 is the dehydration molecular sieve, 12 is the inert gas storage tank, 13 is the first inert gas pipeline, 14 is the first inert gas pipeline, 15 is the flushing solvent storage tank, 16 is the organic lithium flushing pipeline, 17 is the organic amine flushing pipeline, 18 is the organic amine feed pump, 19 is the mixing chamber, 20 is the circulating liquid chamber, 21 is the jacket, 22 is the organic lithium solution filling port, 23 is the organic amine solution filling port, 24 is the mixing reactor outlet, 25 is the circulating liquid inlet, and 26 is the circulating liquid outlet. 27 is the drain pipe, 28 is the coolant inlet pipe, 29 is the circulating fluid outlet pipe, 30 is the connecting pipe, and 31 is the functionalized lithium pipe. Detailed Implementation

[0020] This invention is not limited to the following embodiments, and specific implementation methods can be determined according to the technical solutions and actual conditions of this invention. Unless otherwise specified, all chemical reagents and chemicals mentioned in this invention are well-known and commonly used chemical reagents and chemicals in the prior art; unless otherwise specified, all percentages in this invention are mass percentages; unless otherwise specified, all solutions in this invention are aqueous solutions with water as the solvent, for example, hydrochloric acid solution is an aqueous solution of hydrochloric acid; room temperature in this invention generally refers to a temperature between 15°C and 25°C, generally defined as 25°C.

[0021] The present invention will be further described below with reference to embodiments: Example 1: The functionalized lithium of the synthetic rubber was prepared by the following method: First, the required amount of organic amine was dried and then diluted with a first organic solvent to obtain an organic amine solution; Second, the required amount of organic lithium was dissolved in a second organic solvent to obtain an organic lithium solution; Third, the organic amine solution and the organic lithium solution were mixed and reacted, and the heat of reaction was removed simultaneously to obtain the functionalized lithium of the synthetic rubber.

[0022] Example 2: As an optimization of the above example, in the first step, the organic amine is at least one of aliphatic amines, alcoholic amines, amides, alicyclic amines, aromatic amines and naphthyl amines, and the first organic solvent is at least one of cyclopentane, cyclohexane, n-hexane and toluene.

[0023] Example 3: As an optimization of the above example, in the first step, the mass concentration of the organic amine solution is 5% to 85%.

[0024] Example 4: As an optimization of the above example, in the second step, the organic lithium is one of n-butyllithium, methyllithium, sec-butyllithium, tert-butyllithium, phenyllithium and dilithium initiators, and the second organic solvent is at least one of cyclopentane, cyclohexane and n-hexane.

[0025] Example 5: As an optimization of the above example, in the second step, the mass concentration of the organic lithium solution is 5% to 30%.

[0026] Example 6: As an optimization of the above example, in the third step, the molar ratio of N atoms to Li atoms in the functionalized lithium of the synthetic rubber is 0.05 to 0.95.

[0027] Example 7: A method for preparing the functionalized lithium of the synthetic rubber includes: First, drying the required amount of organic amine and diluting the dried organic amine with a first organic solvent to obtain an organic amine solution; Second, dissolving the required amount of organic lithium in a second organic solvent to obtain an organic lithium solution; Third, mixing the organic amine solution and the organic lithium solution and simultaneously removing the heat of reaction to obtain the functionalized lithium of the synthetic rubber.

[0028] Example 8: As an optimization of the above examples, the preparation method of functionalized lithium in synthetic rubber is carried out according to the following steps: First, after drying hexamethyleneimine, the dried organic amine is diluted with cyclopentane to obtain an organic amine solution with a mass concentration of 5% to 85%; Second, n-butyllithium is dissolved in n-hexane to obtain an organic lithium solution with a mass concentration of 5% to 30%; Third, the organic amine solution with a mass concentration of 5% to 85% and the organic lithium solution with a mass concentration of 5% to 30% are mixed and reacted, and the heat of reaction is removed to obtain functionalized lithium in synthetic rubber with a molar ratio of N atoms to Li atoms of 0.05 to 0.95.

[0029] Example 9: As Figure 1 As shown, the apparatus for preparing functionalized lithium of synthetic rubber includes: an organolithium storage tank 1, an organoamine storage tank 2, an organoamine dehydration bed 3, an organoamine dilution tank 4, and a mixing reactor 5. An organolithium solution pipeline 6 is fixedly connected between the outlet of the organolithium storage tank 1 and the first inlet at the top of the mixing reactor 5. An organoamine dehydration pipeline 7 is fixedly connected between the top outlet of the organoamine dehydration bed 2 and the bottom inlet of the organoamine dehydration bed 3. An organoamine dilution pipeline 8 is fixedly connected between the top outlet of the organoamine dehydration bed 3 and the top inlet of the organoamine dilution tank 4. An organoamine solution pipeline 9 is fixedly connected between the bottom outlet of the organoamine dilution tank 4 and the second inlet at the top of the mixing reactor 5. A cooling liquid inlet pipeline 28 is fixedly connected to the upper inlet of the mixing reactor 5. A circulating liquid outlet pipeline 29 is fixedly connected to the lower outlet of the mixing reactor 5. A functionalized lithium pipeline 31 is fixedly connected to the bottom outlet of the mixing reactor 5.

[0030] As needed, a connecting pipe 30 is fixedly connected between the coolant inlet pipe 28 and the circulating fluid outlet pipe 29.

[0031] As needed, the organic amine dilution tank 4 is equipped with a stirring device 10, which can obtain a uniform organic amine solution under the stirring of the stirring device 10. The organic amine dehydration bed 3 is equipped with a dehydration molecular sieve 11.

[0032] As needed, an organic amine feed pump 18 is fixedly installed on the organic amine solution pipeline 9.

[0033] As needed, a drain pipe 27 is fixedly connected to the organic amine dehydration pipeline 7.

[0034] Depending on the requirements, the mixing reactor 5 is a static mixing reactor, which can be any one of the SV, SK, SX, SH, or SL types. The mixing reactor 5 can ensure better material residence time and reaction effect.

[0035] like Figure 2 As shown, the mixing reactor 5 includes a mixing chamber 19, a circulating liquid chamber 20, and a jacket 21. The mixing chamber 19 includes an organolithium solution inlet 22, an organoamine solution inlet 23, and a mixing reactor outlet 24. like Figure 2 As shown, the circulating liquid chamber 20 includes a circulating liquid inlet 25 and a circulating liquid outlet 26, which are used to cool the mixing chamber 19 with coolant to remove the heat of reaction generated when the organic lithium solution and the organic amine solution are mixed. like Figure 2 As shown, the jacket 21 is a heat insulation layer covering the outer wall of the circulating liquid chamber 20, the lithium organic solution filling port 22, the organic amine solution filling port 23, and the mixing reactor outlet 24, and is used to insulate the mixing reactor 5.

[0036] Example 10: As an optimization of the above embodiments, such as Figure 1 As shown, the device also includes an inert gas storage tank 12, a first inert gas pipeline 13 is fixedly connected between the outlet of the inert gas storage tank 12 and the top inlet of the organic amine storage tank 2, and a second inert gas pipeline 14 is fixedly connected between the first inert gas pipeline 13 and the organic amine dilution pipeline 8.

[0037] As needed, the inert gas in the inert gas storage tank 12 can provide inert gas protection for the organic amine dilution tank 4 and the organic amine storage tank 2.

[0038] Example 11: As an optimization of the above embodiments, such as Figure 1As shown, the device also includes a flushing solvent storage tank 15, an organic lithium flushing pipeline 16 is fixedly connected between the outlet of the flushing solvent storage tank 15 and the organic lithium solution pipeline 6, and an organic amine flushing pipeline 17 is fixedly connected between the organic lithium flushing pipeline 16 and the organic amine solution pipeline 9.

[0039] As needed, the flushing solvent in the flushing solvent storage tank 15 is at least one of benzene, toluene, xylene, pentane, hexane, octane, cyclohexane, and cyclopentane, which can flush the residual organic lithium precipitate and organic amine precipitate in the outlet of the organic lithium solution pipeline 6 and the outlet of the organic amine solution pipeline 9.

[0040] Depending on the needs, the pipelines and equipment of the synthetic rubber functionalized lithium preparation apparatus may also be equipped with conventional valves, thermometers and pressure gauges known in the art, as required by production.

[0041] Example 12: As an optimization of the above embodiments, such as Figure 1 As shown, the preparation method of functionalized lithium compounds for synthetic rubber is carried out according to the following steps: First, 2.1 kg of hexamethyleneimine in organic amine storage tank 2 is dried by passing it through organic amine dehydration bed 3 (dehydration molecular sieve). Then, cyclopentane is used as a solvent to dilute the dried hexamethyleneimine in organic amine dilution tank 4 to obtain an organic amine solution with a mass concentration of 30%. Meanwhile, 9.9 kg of n-butyllithium was dissolved in n-hexane to obtain an organolithium solution with a mass concentration of 20%, which was stored in organolithium storage tank 1. Then, a 30% (w / w) organic amine solution and a 20% (w / w) organic lithium solution are simultaneously injected into the mixing reactor 5. Cyclopentane is then used to flush the outlets of the organic lithium solution line 6 and the organic amine solution line 7 to remove residual organic lithium and organic amine precipitates. The organic amine and organic lithium solutions in the mixing reactor 5 undergo a mixing reaction, and the heat of reaction is simultaneously removed, yielding functionalized lithium compounds (amine lithium initiators) for synthetic rubber with a molar ratio of N atoms to Li atoms of 0.05 to 0.95. Finally, the functionalized lithium groups of the synthetic rubber obtained above were added to the polymerization reactor as lithium amine initiator to initiate an anionic polymerization reaction of 2500 kg butadiene and 750 kg styrene and other monomers. As the polymerization reaction started, the temperature and pressure of the polymerization reactor continued to rise. During the polymerization reaction, the temperature was controlled not to exceed 100℃ and the pressure not to exceed 0.6 MPa. When the polymerization conversion rate reached 100%, the coupling agent silicon tetrachloride was added to obtain a functionalized solution polystyrene-butadiene rubber product with a functionalization degree of more than 10%. The Mooney viscosity of this functionalized solution polystyrene-butadiene rubber product was 60, the molecular weight was 146,000, and the molecular weight distribution was 1.1, which can be used in tire manufacturing.

[0042] Example 13: As an optimization of the above embodiments, such as Figure 1 As shown, the preparation method of functionalized lithium compounds for synthetic rubber is carried out according to the following steps: First, 3 kg of hexamethyleneimine in organic amine storage tank 1 is dried by passing it through organic amine dehydration bed 3 (dehydration molecular sieve). Then, cyclopentane is used as a solvent to dilute the dried hexamethyleneimine in organic amine dilution tank 4 to obtain an organic amine solution with a mass concentration of 25%. Meanwhile, 6 kg of n-butyllithium was dissolved in n-hexane to obtain an organolithium solution with a mass concentration of 15%, which was stored in organolithium storage tank 1. Then, a 25% (w / w) organic amine solution and a 15% (w / w) organic lithium solution are simultaneously injected into the mixing reactor 5. Cyclopentane is then used to flush the outlets of the organic lithium solution line 6 and the organic amine solution line 7 to remove residual organic lithium and organic amine precipitates. The organic amine and organic lithium solutions in the mixing reactor 5 undergo a mixing reaction, and the heat of reaction is simultaneously removed, yielding functionalized lithium compounds (amine lithium initiators) for synthetic rubber with a molar ratio of N atoms to Li atoms of 0.05 to 0.95. Finally, the functionalized lithium groups of the synthetic rubber obtained above were added to the polymerization reactor as lithium amine initiator to initiate an anionic polymerization reaction of 2500 kg butadiene and 750 kg styrene and other monomers. As the polymerization reaction started, the temperature and pressure of the polymerization reactor continued to rise. During the polymerization reaction, the temperature was controlled not to exceed 100℃ and the pressure not to exceed 0.6 MPa. When the polymerization conversion rate reached 100%, the coupling agent silicon tetrachloride was added to obtain a functionalized solution polystyrene-butadiene rubber product with a functionalization degree of more than 5%. The Mooney viscosity of this functionalized solution polystyrene-butadiene rubber product was 70, the molecular weight was 180,000, and the molecular weight distribution was 1.1. It can be used in tire manufacturing.

[0043] Example 14: As an optimization of the above embodiments, such as Figure 1 As shown, the preparation method of functionalized lithium compounds for synthetic rubber is carried out according to the following steps: First, 2.7 kg of hexamethyleneimine in organic amine storage tank 2 is dried by passing it through organic amine dehydration bed 3 (dehydration molecular sieve). Then, cyclopentane is used as a solvent to dilute the dried hexamethyleneimine in organic amine dilution tank 4 to obtain an organic amine solution with a mass concentration of 27.5%. Meanwhile, 7 kg of n-butyllithium was dissolved in n-hexane to obtain an organolithium solution with a mass concentration of 17%, which was stored in organolithium storage tank 1. Then, an organic amine solution with a mass concentration of 27.5% and an organic lithium solution with a mass concentration of 17% are simultaneously injected into the mixing reactor 5. The organic lithium precipitate and organic amine precipitate remaining in the outlet of the organic lithium solution line 6 and the outlet of the organic amine solution line 7 are flushed with cyclopentane. The organic amine solution and organic lithium solution in the mixing reactor 5 are mixed and reacted, and the heat of reaction is removed simultaneously to obtain functionalized lithium (amine lithium initiator) for synthetic rubber with a molar ratio of N atoms to Li atoms of 0.05 to 0.95. Finally, the functionalized lithium groups of the synthetic rubber obtained above were added to the polymerization reactor as lithium amine initiator to initiate an anionic polymerization reaction of 2500 kg butadiene and 750 kg styrene and other monomers. As the polymerization reaction started, the temperature and pressure of the polymerization reactor continued to rise. During the polymerization reaction, the temperature was controlled not to exceed 100℃ and the pressure not to exceed 0.6 MPa. When the polymerization conversion rate reached 100%, the coupling agent silicon tetrachloride was added to obtain a functionalized solution polystyrene-butadiene rubber product with a functionalization degree of more than 45%. The Mooney viscosity of this functionalized solution polystyrene-butadiene rubber product was 65, the molecular weight was 160,000, and the molecular weight distribution was 1.1. It can be used in tire manufacturing.

[0044] Comparative Example 1: Figure 1 As shown, the preparation method for functionalized solution-polymerized styrene-butadiene rubber using organic amines and organic lithium as amine lithium initiators is the same as in Example 12, except that: a 30% (w / w) organic amine solution and a 20% (w / w) organic lithium solution are directly injected into the polymerization reactor (to eliminate the mixing reaction of the organic amine solution and organic lithium solution in the mixing reactor 5) to prepare functionalized solution-polymerized styrene-butadiene rubber. Other steps and conditions are the same.

[0045] In Comparative Example 1, due to the delay in the preparation and addition time of the organic amine solution and organic lithium solution, the activity of the amine lithium initiator in the polymerization reactor was reduced, resulting in a functionalized solution-polymerized styrene-butadiene rubber product with a functionalization degree of less than 10%.

[0046] Comparative Example 2: The preparation method for functionalized solution-polymerized styrene-butadiene rubber using organic amines and organic lithium as amine-lithium initiators is the same as in Example 13, except that: a 25% (w / w) organic amine solution and a 15% (w / w) organic lithium solution are directly injected into the polymerization reactor (to eliminate the mixing reaction of the organic amine solution and organic lithium solution in the mixing reactor 5) to prepare functionalized solution-polymerized styrene-butadiene rubber. Other steps and conditions are the same.

[0047] In Comparative Example 2, due to the delay in the preparation and addition time of the organic amine solution and organic lithium solution, the activity of the amine lithium initiator in the polymerization reactor was reduced, resulting in a functionalized solution-polymerized styrene-butadiene rubber product with a functionalization degree of less than 5%.

[0048] Comparative Example 3: The preparation method for functionalized solution-polymerized styrene-butadiene rubber using organic amines and organic lithium as amine lithium initiators is the same as in Example 14, except that: a 27.5% (w / w) organic amine solution and a 17% (w / w) organic lithium solution are directly injected into the polymerization reactor (to eliminate the mixing reaction of the organic amine solution and organic lithium solution in the mixing reactor 5) to prepare functionalized solution-polymerized styrene-butadiene rubber. Other steps and conditions are the same.

[0049] In Comparative Example 3, due to the delay in the preparation and addition time of the organic amine solution and organic lithium solution, the activity of the amine lithium initiator in the polymerization reactor was reduced, resulting in a functionalized solution-polymerized styrene-butadiene rubber product with a functionalization degree of less than 45%.

[0050] The functionalized lithium in the synthetic rubber of this invention has small molecular weight fluctuations and narrow distribution, reduces the amount of initiator used for impurity removal by 20%, and has stable Mooney viscosity that is easy to control.

[0051] In summary, the functionalized lithium groups of synthetic rubber obtained by this invention, as an amine lithium initiator for synthetic rubber, can maintain high initiator activity and improve the functionalization of synthetic rubber products.

[0052] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A functionalized lithium group for synthetic rubber, characterized in that... The organic amine was prepared according to the following method: First, the required amount of organic amine was dried and then diluted with a first organic solvent to obtain an organic amine solution; Second, the required amount of organic lithium was dissolved in a second organic solvent to obtain an organic lithium solution; Third, the organic amine solution and the organic lithium solution were mixed and reacted, and the heat of reaction was removed simultaneously to obtain functionalized lithium for synthetic rubber.

2. The lithium functionalized synthetic rubber according to claim 1, characterized in that... In the first step, the organic amine is at least one of aliphatic amines, alcoholic amines, amides, alicyclic amines, aromatic amines, and naphthyl amines, and the first organic solvent is at least one of cyclopentane, cyclohexane, n-hexane, and toluene.

3. The lithium functionalized synthetic rubber according to claim 1 or 2, characterized in that... In the first step, the mass concentration of the organic amine solution is 5% to 85%.

4. The functionalized lithium group of synthetic rubber according to claim 1, 2, or 3, characterized in that... In the second step, the organolithium is one of n-butyllithium, methyllithium, sec-butyllithium, tert-butyllithium, phenyllithium, and dilithium initiators, and the second organic solvent is at least one of cyclopentane, cyclohexane, and n-hexane.

5. The functionalized lithium group of synthetic rubber according to claim 1, 2, 3, or 4, characterized in that... In the second step, the mass concentration of the organic lithium solution is 5% to 30%.

6. The lithium functionalized synthetic rubber according to any one of claims 1 to 5, characterized in that... In the third step, the molar ratio of N atoms to Li atoms in the functionalized lithium groups of the synthetic rubber is 0.05 to 0.

95.

7. A method for preparing lithium functionalized groups of synthetic rubber according to any one of claims 2 to 6, characterized in that... include: The first step involves drying the required amount of organic amine and then diluting the dried organic amine with a first organic solvent to obtain an organic amine solution. The second step involves dissolving the required amount of organic lithium in a second organic solvent to obtain an organic lithium solution. The third step involves mixing the organic amine solution and the organic lithium solution and simultaneously removing the heat of reaction to obtain functionalized lithium for synthetic rubber.

8. An apparatus for preparing lithium functionalized synthetic rubber according to any one of claims 1 to 6, characterized in that... include: The system includes an organic lithium storage tank, an organic amine storage tank, an organic amine dehydration bed, an organic amine dilution tank, and a mixing reactor. An organic lithium solution pipeline is fixedly connected between the outlet of the organic lithium storage tank and the first inlet at the top of the mixing reactor. An organic amine dehydration pipeline is fixedly connected between the top outlet of the organic amine storage tank and the bottom inlet of the organic amine dehydration bed. An organic amine dilution pipeline is fixedly connected between the top outlet of the organic amine dehydration bed and the top inlet of the organic amine dilution tank. An organic amine solution pipeline is fixedly connected between the bottom outlet of the organic amine dilution tank and the second inlet at the top of the mixing reactor. A coolant inlet pipeline is fixedly connected to the upper inlet of the mixing reactor. A circulating liquid outlet pipeline is fixedly connected to the lower outlet of the mixing reactor. A functionalized lithium pipeline is fixedly connected to the bottom outlet of the mixing reactor.

9. The apparatus for preparing lithium functionalized synthetic rubber according to claim 8, characterized in that... It also includes an inert gas storage tank, with a first inert gas pipeline fixedly connected between the outlet of the inert gas storage tank and the top inlet of the organic amine storage tank, and a second inert gas pipeline fixedly connected between the first inert gas pipeline and the organic amine dilution pipeline.

10. The apparatus for preparing lithium functionalized synthetic rubber according to claim 8 or 9, characterized in that... It also includes a flushing solvent storage tank, with an organic lithium flushing pipeline fixedly connected between the outlet of the flushing solvent storage tank and the organic lithium solution pipeline, and an organic amine flushing pipeline fixedly connected between the organic lithium flushing pipeline and the organic amine solution pipeline.

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