Environmentally friendly terminator, preformulation, preparation and application of emulsion styrene butadiene rubber polymerization system

Abstract

The present invention provides an environmentally friendly terminator, preformulation, preparation and application of an emulsion styrene butadiene rubber polymerization system, wherein the environmentally friendly terminator is an aqueous solution; the mass concentration of the environmentally friendly terminator A ion is 20% to 40%; the mass concentration of the terminator B is 10% to 15%; the mass ratio of the terminator A ion to the terminator B is 10:1 to 1:1; the terminator A ion is a piperazine-N,N-bis-dithiocarbamate ion; and the terminator B is N-isopropylhydroxylamine. There is a bis-dithiocarbamate group in terminator A, and only a small amount can terminate the polymerization reaction. Terminator B is a nucleophilic acylating agent, which is rapid and effective in terminating the reaction. The environmentally friendly terminator directly destroys the peroxide in the system, quickly eliminates free radicals and initiators in the emulsion styrene butadiene rubber polymerization reaction, terminates the reaction and does not affect the stability of the emulsion.

Description

Technical Field

[0001] The invention relates to the field of terminators, and in particular to an environmentally friendly terminator, a preformulation, a preparation and an application of an emulsion styrene-butadiene rubber polymerization system. Background Art

[0002] In the polymerization of emulsion styrene butadiene rubber, it is usually necessary to terminate the polymerization reaction in time at a specified conversion rate through a terminator to prevent the formation of polymer gel, the reaction explosion phenomenon and ensure the quality of the resulting polymer. The preparation process of traditional terminators will produce nitrosamines and harmful odors, which are easy to cause environmental pollution during use. Summary of the invention

[0003] The main purpose of the present invention is to provide an environmentally friendly terminator, preformulation, preparation and application of an emulsion styrene butadiene rubber polymerization system, so as to provide a terminator that has a small amount of usage and effectively terminates the polymerization reaction and can react with an initiator, and at the same time can stably prepare an emulsion styrene butadiene rubber product that does not contain nitrosamines.

[0004] To achieve the above object, the present invention provides a preformulation of an environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system, comprising a terminator A and a terminator B, wherein the mass ratio of the terminator A to the terminator B is 10:1 to 1:1.

[0005] The terminator A is sodium piperazine-N,N-bisdithiocarbamate or potassium piperazine-N,N-bisdithiocarbamate; and the terminator B is N-isopropylhydroxylamine.

[0006] An environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system, wherein the environmentally friendly terminator is an aqueous solution; corresponding masses of terminator A and terminator B are added to corresponding masses of water for preparation; since there are many methods for preparing the environmentally friendly terminator, no specific limitation is made, and the mass fraction of each component in the environmentally friendly terminator can be achieved after mixing.

[0007] The environmentally friendly terminator includes terminator A ions and terminator B.

[0008] Wherein, the mass concentration of the terminator A ion is 20%; the mass concentration of the terminator B is 15%; and the mass ratio of the terminator A ion to the terminator B is 10:1~1:1.

[0009] The terminator A ion is piperazine-N,N-bisdithiocarbamate ion; the terminator B is N-isopropylhydroxylamine.

[0010] According to an embodiment of the present application, the solvent in the environmentally friendly terminator is water; the solute in the environmentally friendly terminator includes a compound of the terminator A ion and a compound of the terminator B.

[0011] According to an embodiment of the present application, a method for preparing an environmentally friendly terminator for the emulsion styrene-butadiene rubber polymerization system comprises:

[0012] The terminator A solution and the terminator B solution are mixed and stirred evenly to obtain the environmentally friendly terminator.

[0013] Wherein, the terminator A solution is a sodium piperazine-N,N-bisdithiocarbamate or potassium piperazine-N,N-bisdithiocarbamate solution with a mass concentration of 20%.

[0014] The terminator B solution is an N-isopropylhydroxylamine solution with a mass concentration of 15%.

[0015] The mass ratio of the terminator A solution to the terminator B solution is 5:1.

[0016] According to an embodiment of the present application, when the terminator A solution is a piperazine-N,N-bisdithiocarbamate potassium solution, it is prepared by a 40% piperazine-N,N-bisdithiocarbamate potassium solution.

[0017] The present invention also provides an application of an environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system, comprising:

[0018] In the step of polymerizing styrene and butadiene to generate emulsion styrene-butadiene rubber, the environmentally friendly terminator or the prepared environmentally friendly terminator is added.

[0019] When the polymerization reaction conversion rate reaches 60% to 70%, the environmentally friendly terminator is added.

[0020] Wherein, the terminator A solution accounts for 0.01% to 0.5% of the weight of the emulsion styrene-butadiene rubber.

[0021] The terminator B solution accounts for 0.001% to 0.05% of the weight of the emulsion styrene-butadiene rubber.

[0022] According to an embodiment of the present application, the step of generating the emulsion styrene-butadiene rubber comprises:

[0023] Under nitrogen atmosphere, soft water, emulsifier, electrolyte solution, activator and regulator are added to the styrene and butadiene to obtain a mixed solution.

[0024] After the temperature of the mixed solution drops, an initiator is added to obtain the emulsion styrene-butadiene rubber.

[0025] According to an embodiment of the present application, the synthetic rubber is emulsion styrene butadiene rubber, and the terminator A solution with a mass concentration of 20% accounts for 0.10% to 0.15% of the weight of the emulsion styrene butadiene rubber.

[0026] According to the implementation mode of the present application, the synthetic rubber is emulsion styrene butadiene rubber, and the terminator B solution with a mass concentration of 15% accounts for 0.01-0.03% of the weight of the emulsion styrene butadiene rubber.

[0027] According to an embodiment of the present application, the temperature of the mixed solution drops to 4.5°C to 5.5°C; and the initiator is p-menthane hydroperoxide.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The environmentally friendly terminator provided by the present invention includes terminator A and terminator B, both of which have good stability.

[0030] The terminator A is piperazine-N,N-bisdithiocarbamate, which has a bisdithiocarbamate group and can react with free radicals and initiators more quickly. Only a small amount of it can terminate the polymerization reaction.

[0031] Terminator B is N-isopropylhydroxylamine, which is a good nucleophilic acylating agent. The acylating agent is lacking in electricity, while the free radicals in the polymerization active system are rich in electricity. At the same time, the aromatic ring of the polymerization monomer styrene is rich in electricity, so it is fast and effective in terminating the free radical reaction.

[0032] The two have appropriate mass concentrations. Under the synergistic promotion of the two, the environmentally friendly terminator can directly destroy the peroxide in the redox system, namely, hydroperoxide-p-menthane, and can quickly eliminate free radicals and initiators in the emulsion styrene butadiene rubber polymerization reaction, quickly terminate the polymerization reaction, and can also react with macromolecular free radicals in the emulsion styrene butadiene rubber polymerization reaction to generate a macromolecular chain with a thiol end and an inactive free radical.

[0033] The environmentally friendly terminator does not affect the stability of the emulsion, and does not affect the chemical and physical properties of the emulsion polystyrene-butadiene rubber. Therefore, the environmentally friendly terminator has a small amount of use and has good termination performance. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0037] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The main purpose of the present invention is to provide an environmentally friendly terminator, preformulation, preparation and application of an emulsion styrene butadiene rubber polymerization system, so as to provide a terminator that is used in a small amount and effectively terminates the polymerization reaction and can react with an initiator, and can stably prepare an emulsion styrene butadiene rubber product that does not contain nitrosamines.

[0039] To achieve the above object, the present invention provides a preformulation of an environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system, comprising a terminator A and a terminator B, wherein the mass ratio of the terminator A to the terminator B is 10:1 to 1:1.

[0040] The terminator A is sodium piperazine-N,N-bisdithiocarbamate or potassium piperazine-N,N-bisdithiocarbamate; and the terminator B is N-isopropylhydroxylamine.

[0041] The preformulation of the environmentally friendly terminator is convenient for transportation and storage. The environmentally friendly terminator can be prepared by uniformly mixing the preformulation of the environmentally friendly terminator with an appropriate amount of water.

[0042] An environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system, wherein the environmentally friendly terminator is an aqueous solution; corresponding masses of terminator A and terminator B are added to corresponding masses of water for preparation; since there are many methods for preparing the environmentally friendly terminator, no specific limitation is made, and the mass fraction of each component in the environmentally friendly terminator can be achieved after mixing.

[0043] For example, an aqueous solution of terminator A is mixed with an aqueous solution of terminator B. There is no specific requirement for the solubility of the aqueous solution of terminator A and the solubility of the aqueous solution of terminator B, and the mass fraction of each component in the environmentally friendly terminator is achieved after the two are mixed.

[0044] The environmentally friendly terminator includes terminator A ions and terminator B.

[0045] Among them, the mass concentration of the terminator A ion is 20%; the mass concentration of the terminator B is 15%; the mass ratio of the terminator A ion to the terminator B is 10:1~1:1; if the mass concentration of the terminator A ion is low, the effect of terminating the polymerization reaction is poor; correspondingly, when the mass concentration of the terminator A ion is high, the effect of terminating the polymerization reaction is equivalent, but the relative cost is increased, which is not conducive to industrial production.

[0046] The terminator A ion is piperazine-N,N-bisdithiocarbamate ion; the terminator B is N-isopropylhydroxylamine.

[0047] According to an embodiment of the present application, the solvent in the environmentally friendly terminator is water; the solute in the environmentally friendly terminator includes a compound of the terminator A ion and a compound of the terminator B.

[0048] The main components of the environmentally friendly terminator include terminator A ions and terminator B. Relative to terminator A ions, the solute corresponding to the environmentally friendly terminator is a compound that can generate (eg, by hydrolysis) terminator A ions when dissolved in water.

[0049] For example, the solute of the environmentally friendly terminator is a compound of the terminator A ion, such as sodium piperazine-N,N-bisdithiocarbamate or potassium piperazine-N,N-bisdithiocarbamate. The molecular formula of sodium piperazine-N,N-bisdithiocarbamate is:

[0050] ;

[0051] Relative to terminator B, the solute corresponding to the environmentally friendly terminator is a compound that is soluble in water and can produce (such as dissolve) terminator B. The solute of the environmentally friendly terminator is a compound of the terminator B, such as N-isopropylhydroxylamine.

[0052] Taking this preparation method as an example, the present application also provides a method for preparing an environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system, comprising:

[0053] The terminator A solution and the terminator B solution are mixed and stirred evenly to obtain the environmentally friendly terminator; the mixing and stirring time is 0.5h~1.0h.

[0054] Wherein, the terminator A solution is a sodium piperazine-N,N-bisdithiocarbamate or potassium piperazine-N,N-bisdithiocarbamate solution with a mass concentration of 20%.

[0055] The terminator B solution is an N-isopropylhydroxylamine solution with a mass concentration of 15%; for example, the solvent in the terminator B solution is water.

[0056] The mass ratio of the terminator A solution to the terminator B solution is 5:1.

[0057] The preparation method of the environmentally friendly terminator is simple, and the raw materials are easily available, and the terminator A, terminator B and water are uniformly mixed. In addition, the prepared environmentally friendly terminator is not easy to hydrolyze, and meets the requirements of environmental protection.

[0058] According to an embodiment of the present application, when the terminator A solution is a piperazine-N,N-bisdithiocarbamate potassium solution, it is prepared by a 40% piperazine-N,N-bisdithiocarbamate potassium solution. For example, a piperazine-N,N-bisdithiocarbamate potassium solution having a mass concentration of 40% is diluted with water to obtain a piperazine-N,N-bisdithiocarbamate potassium solution having a mass concentration of 20%.

[0059] The present invention also provides an application of an environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system, comprising:

[0060] In the step of polymerizing styrene and butadiene to generate emulsion styrene-butadiene rubber, the environmentally friendly terminator or the prepared environmentally friendly terminator is added.

[0061] When the polymerization reaction conversion rate reaches 60% to 70%, the environmentally friendly terminator is added.

[0062] Wherein, the terminator A solution accounts for 0.01% to 0.5% of the weight of the emulsion styrene-butadiene rubber.

[0063] The terminator B solution accounts for 0.001% to 0.05% of the weight of the emulsion styrene-butadiene rubber.

[0064] In this embodiment, the environmentally friendly terminator can terminate the polymerization reaction of the emulsion styrene butadiene rubber by adding only a small amount, has good stability, and the prepared emulsion styrene butadiene rubber does not contain nitrosamines.

[0065] According to an embodiment of the present application, the step of generating the emulsion styrene-butadiene rubber comprises:

[0066] Under nitrogen atmosphere, soft water, emulsifier, electrolyte solution, activator and regulator are added to the styrene and butadiene to obtain a mixed solution; the mixed solution is contained in a polymerization reactor.

[0067] After the temperature of the mixed solution drops, an initiator is added to obtain the emulsion styrene-butadiene rubber.

[0068] Exemplarily, the emulsifier is potassium rosinate soap. The emulsifier can form micelles in the aqueous phase of the polymerization system, emulsify the monomers dispersed in the aqueous phase to form stable monomer droplets, and protect the formed latex particles to prevent the polymer particles from agglomerating.

[0069] For example, the electrolyte solution contains phosphoric acid, sodium hydroxide, sodium salt of ethylenediaminetetraacetic acid and sodium m-methylene dinaphthalene sulfonate. The electrolyte solution can increase the polymerization reaction rate, increase the stability of the polymer emulsion, improve the fluidity of the polymer emulsion at low temperatures, and also has an efficient pH buffering effect, making the system polymerization more stable.

[0070] For example, the activator contains sodium salt of ethylenediaminetetraacetic acid, sodium formaldehyde sulfoxylate and ferrous sulfide. The reducing agent in the activator reacts with the peroxide bond of the activator, electron transfer occurs to form primary free radicals, and then chain initiation is performed to start the polymerization reaction.

[0071] In another exemplary embodiment, the regulator is tert-dodecyl mercaptan. The regulator can increase the stability of the emulsion, promote the formation and growth of styrene butadiene rubber particles, improve the yield and molecular weight distribution of the emulsion styrene butadiene rubber, and can also adjust the size and shape of the styrene butadiene rubber particles and improve the mechanical properties of the styrene butadiene rubber.

[0072] The nitrogen atmosphere mainly replaces the oxygen in the reactor, because oxygen will combine with the free radicals in the polymerization reaction system to generate peroxides, thereby consuming the free radicals and preventing the polymerization reaction from proceeding normally.

[0073] When the temperature of the mixed solution drops, an initiator is added to obtain the emulsion styrene-butadiene rubber. For example, the mixed solution is placed in a water bath for 4 hours and refrigeration is turned on, and when the temperature drops, an initiator is added to carry out polymerization reaction, and the temperature is lowered by a refrigerator.

[0074] According to an embodiment of the present application, the synthetic rubber is emulsion styrene butadiene rubber, and the terminator A solution with a mass concentration of 20% accounts for 0.10% to 0.15% of the weight of the emulsion styrene butadiene rubber.

[0075] According to the implementation mode of the present application, the synthetic rubber is emulsion styrene butadiene rubber, and the terminator B solution with a mass concentration of 15% accounts for 0.01-0.03% of the weight of the emulsion styrene butadiene rubber.

[0076] According to an embodiment of the present application, the temperature of the mixed solution drops to 4.5°C to 5.5°C; and the initiator is p-menthane hydroperoxide.

[0077] For further understanding of the present invention, examples are given below:

[0078] Comparative Example 1

[0079] Taking the polymerization production of emulsion styrene-butadiene rubber as an example, a 2.0L polymerization reactor is used, and the polymerization reactor is vacuumed and replaced with nitrogen; soft water, emulsifier, electrolyte solution, activator, regulator, styrene and butadiene are added into the polymerization reactor; the polymerization reactor is placed in a water bath for 4 hours and refrigeration is turned on, and when the temperature drops to 4.5°C~5.5°C, initiator hydrogen peroxide is added to polymerize menthane, and when the conversion rate of the polymerization reaction reaches 60%~70%, the latex (without adding terminator) just after the polymerization is taken and divided into 3 equal groups A0, B0, C0.

[0080] Among them, group A0 did not add terminator (initial latex) and served as blank sample.

[0081] The B0 group is added with a conventional terminator, wherein the conventional terminator includes sodium dimethyldithiocarbamate, diethylhydroxylamine, and ammonium nitrite, and the amount of the conventional terminator added accounts for 0.50% of the weight of the synthetic latex styrene-butadiene rubber.

[0082] In group C0, only terminator A was added, wherein the terminator A was a piperazine-N,N-bisdithiocarbamate aqueous solution with a mass concentration of 20%, and the amount of the terminator A added accounted for 0.15% of the weight of the synthetic latex styrene-butadiene rubber.

[0083] As shown in Table 1, Table 1 shows the above-mentioned polymer components and weight fractions.

[0084] Table 1 Polymer components and weight fractions

[0085]

[0086] Example 1

[0087] The difference from Comparative Example 1 is that when the reaction conversion rate reaches 60% to 70%, the latex just after the polymerization is completed (without adding a terminator) is taken and divided into three equal groups A1, B1, and C1.

[0088] Among them, group A1 did not add terminator (initial latex) and served as a blank sample.

[0089] The B1 group is added with a conventional terminator, wherein the conventional terminator includes sodium dimethyldithiocarbamate, diethylhydroxylamine, and ammonium nitrite, and the amount of the conventional terminator added accounts for 1.0% of the weight of the synthetic latex styrene-butadiene rubber.

[0090] An environmentally friendly terminator is added to group C1. The environmentally friendly terminator includes terminator A and terminator B. The terminator A is a piperazine-N,N-bisdithiocarbamate aqueous solution with a mass concentration of 20%, the terminator B is an N-isopropylhydroxylamine solution with a mass concentration of 15%, the terminator A is added in an amount of 0.1% by weight of the synthetic latex styrene-butadiene rubber, and the terminator B is added in an amount of 0.02% by weight of the synthetic latex styrene-butadiene rubber.

[0091] Example 2

[0092] The difference from Comparative Example 1 is that when the reaction conversion rate reaches 60% to 70%, the latex just after the polymerization is completed (without adding a terminator) is taken and divided into three equal groups A2, B2, and C2.

[0093] Among them, group A2 did not add terminator (initial latex) and served as a blank sample.

[0094] The B2 group is added with a conventional terminator, wherein the conventional terminator includes sodium dimethyldithiocarbamate, diethylhydroxylamine, and ammonium nitrite, and the amount of the conventional terminator added accounts for 1.0% of the weight of the synthetic latex styrene-butadiene rubber.

[0095] The C2 group adds an environmentally friendly terminator. The environmentally friendly terminator includes terminator A and terminator B. The terminator A is a piperazine-N,N-bisdithiocarbamate aqueous solution with a mass concentration of 20%, the terminator B is an N-isopropylhydroxylamine solution with a mass concentration of 15%, the terminator A is added in an amount of 0.15% by weight of the synthetic latex styrene-butadiene rubber, and the terminator B is added in an amount of 0.03% by weight of the synthetic latex styrene-butadiene rubber.

[0096] Example 3

[0097] The difference from Example 1 is that when the reaction conversion rate reaches 60% to 70%, the latex just after the polymerization is completed (without adding a terminator) is taken and divided into three equal groups A3, B3, and C3.

[0098] Among them, group A3 did not add terminator (initial latex) and served as blank sample.

[0099] The B3 group is added with a conventional terminator, wherein the conventional terminator includes sodium dimethyldithiocarbamate, diethylhydroxylamine, and ammonium nitrite, and the amount of the conventional terminator added accounts for 1.0% of the weight of the synthetic latex styrene-butadiene rubber.

[0100] The C3 group adds an environmentally friendly terminator. The environmentally friendly terminator includes terminator A and terminator B. The terminator A is a 40% mass concentration of potassium piperazine-N,N-dithiocarbamate aqueous solution, the terminator B is a 10% mass concentration of N-isopropylhydroxylamine solution, the terminator A is added in an amount of 0.1% by weight of the synthetic latex styrene-butadiene rubber, and the terminator B is added in an amount of 0.02% by weight of the synthetic latex styrene-butadiene rubber.

[0101] Example 4

[0102] The difference from Example 1 is that when the reaction conversion rate reaches 60% to 70%, the latex just after the polymerization is completed (without adding a terminator) is taken and divided into three equal groups A4, B4, and C4.

[0103] Among them, group A4 did not add terminator (initial latex) and served as a blank sample.

[0104] The B4 group is added with a traditional terminator, which includes sodium dimethyldithiocarbamate, diethylhydroxylamine, and ammonium nitrite. The amount of the traditional terminator added accounts for 1.0% of the weight of the synthetic latex styrene-butadiene rubber.

[0105] The C4 group adds an environmentally friendly terminator. The environmentally friendly terminator includes terminator A and terminator B. The terminator A is a 30% mass concentration of potassium piperazine-N,N-dithiocarbamate aqueous solution, the terminator B is a 10% mass concentration of N-isopropylhydroxylamine solution, the terminator A is added in an amount of 0.15% by weight of the synthetic latex styrene-butadiene rubber, and the terminator B is added in an amount of 0.03% by weight of the synthetic latex styrene-butadiene rubber.

[0106] The test data results are shown in Tables 2 and 3, wherein Table 2 is the solid content (TSC) test results (room temperature) before and after latex termination, and Table 3 is the detection results of N-nitrosamines.

[0107] Table 2 Test results of solid content (TSC) before and after latex termination (room temperature)

[0108]

[0109] Table 3 Detection results of N-nitrosamines

[0110]

[0111] ND = NOT DETECTED

[0112] D. = DETECTED

[0113] As can be seen from Table 2, an environmentally friendly terminator is added in Example 2, terminator A is a 20% mass concentration of piperazine-N,N-dithiocarbamate potassium aqueous solution, and the addition amount accounts for 0.15% of the weight of the synthetic latex styrene butadiene rubber; terminator B is a 15% mass concentration of N-isopropylhydroxylamine solution, and the addition amount accounts for 0.03% of the weight of the synthetic latex styrene butadiene rubber. Among them, the solid content (TSC) test results before and after the latex termination are basically the same, indicating that only a small amount of addition can terminate the polymerization reaction. It shows that the environmentally friendly terminator does not affect the stability of the emulsion, and does not affect the chemical and physical properties of the latex styrene butadiene rubber.

[0114] As can be seen from Table 3, N-nitrosamine was not detected in the samples without terminator (initial latex), with terminator A only, and with environmentally friendly terminator, indicating that the prepared latex styrene-butadiene rubber does not contain nitrosamines, and the latex after adding the environmentally friendly terminator does not contain nitrosamines either.

[0115] The above technical solutions of the present invention are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A preformulation of an environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system, characterized in that: The method comprises a terminator A and a terminator B, wherein the mass ratio of the terminator A to the terminator B is 10:1 to 1:1; The terminator A is sodium piperazine-N,N-bisdithiocarbamate or potassium piperazine-N,N-bisdithiocarbamate; and the terminator B is N-isopropylhydroxylamine.

2. An environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system, characterized in that: The environmentally friendly terminator is an aqueous solution; The environmentally friendly terminator includes terminator A ions and terminator B; Wherein, the mass concentration of the terminator A ion is 20% to 40%; the mass concentration of the terminator B is 10% to 15%; the mass ratio of the terminator A ion to the terminator B is 10:1 to 1:1; The terminator A ion is piperazine-N,N-bisdithiocarbamate ion; the terminator B is N-isopropylhydroxylamine.

3. The environmentally friendly terminator for the emulsion styrene-butadiene rubber polymerization system according to claim 2, characterized in that, The mass concentration of the terminator A ion is 20%; the mass concentration of the terminator B is 15%.

4. A method for preparing an environmentally friendly terminator for the emulsion styrene-butadiene rubber polymerization system according to claim 2 or 3, characterized in that: include: The terminator A solution and the terminator B solution are mixed and stirred evenly to obtain the environmentally friendly terminator; Wherein, the terminator A solution is a 20% mass concentration of piperazine-N,N-bisdithiocarbamate sodium or piperazine-N,N-bisdithiocarbamate potassium solution; The terminator B solution is a 15% mass concentration N-isopropylhydroxylamine solution; The mass ratio of the terminator A solution to the terminator B solution is 5:

1.

5. The method for preparing the environmentally friendly terminator of the emulsion styrene-butadiene rubber polymerization system according to claim 4, characterized in that, When the terminator A solution is a piperazine-N,N-bisdithiocarbamate potassium solution, it is prepared by using a 40% piperazine-N,N-bisdithiocarbamate potassium solution.

6. An application of an environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system, characterized in that: include: In the step of polymerizing styrene and butadiene to form emulsion styrene-butadiene rubber, the environmentally friendly terminator according to claim 2 or 3 is added, or the environmentally friendly terminator prepared according to claim 4 or 5 is added; When the polymerization reaction conversion rate reaches 60% to 70%, adding the environmentally friendly terminator; Wherein, the terminator A solution accounts for 0.01% to 0.5% of the weight of the emulsion styrene-butadiene rubber; The terminator B solution accounts for 0.001% to 0.05% of the weight of the emulsion styrene-butadiene rubber.

7. The use of an environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system according to claim 6, characterized in that: The step of generating the emulsion styrene-butadiene rubber comprises: Under a nitrogen atmosphere, adding soft water, an emulsifier, an electrolyte solution, an activator, and a regulator to the styrene and butadiene to obtain a mixed solution; After the temperature of the mixed solution drops, an initiator is added to obtain the emulsion styrene-butadiene rubber.

8. The use of an environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system according to claim 6, characterized in that: The synthetic rubber is emulsion styrene butadiene rubber, and the terminator A solution with a mass concentration of 20% accounts for 0.10% to 0.15% of the weight of the emulsion styrene butadiene rubber.

9. The use of an environmentally friendly terminator for an emulsion styrene-butadiene rubber polymerization system according to claim 6, characterized in that: The synthetic rubber is emulsion styrene butadiene rubber, and the terminator B solution with a mass concentration of 15% accounts for 0.01-0.03% of the weight of the emulsion styrene butadiene rubber.

10. The use of the environmentally friendly terminator for the emulsion styrene-butadiene rubber polymerization system according to claim 7, characterized in that: The temperature of the mixed solution drops to 4.5°C-5.5°C; the initiator is p-menthane hydroperoxide.

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