Preparation method of anti-yellowing butadiene rubber

Abstract

The invention discloses a preparation method of anti-yellowing butadiene rubber. The anti-yellowing butadiene rubber is prepared from the following raw materials in parts by weight: 100 parts of butadiene of which the mass fraction is greater than or equal to 99.0%, 100 parts of normal hexane, 5-20 parts of a reaction catalyst, 3-10 parts of an antioxidant, 10-20 parts of an anti-sticking agent and 5-15 parts of an anti-yellowing aid. Butadiene is used as a main raw material, butadiene rubber is prepared through a multi-kettle coordination anionic solution polymerization process, an antioxidant is added for polymerization to obtain a butadiene rubber solution, the butadiene rubber solution is coagulated to obtain a butadiene rubber solution, and an anti-sticking agent and an anti-yellowing auxiliary agent are added for a coagulation reaction. And dehydrating, drying and extruding the water-carrying colloidal particles to obtain the yellowing-resistant butadiene rubber finished product. The preparation method disclosed by the invention is simple to operate and has good economical efficiency. According to the prepared butadiene rubber, the yellow index of the material is reduced from 21.0 to 10.0 or below, and the oxidation induction time is prolonged from 7.9 min to 20.0 min or above.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber synthesis, and in particular relates to a method for preparing yellowing-resistant butadiene rubber. Background Art

[0002] Butadiene rubber is the abbreviation of cis-1,4-polybutadiene rubber, and its molecular formula is (C 4 H 6 )n. Butadiene rubber is a synthetic rubber with a regular structure formed by the polymerization of butadiene, and its cis structure content is more than 95%. According to different catalysts, it can be divided into nickel (Ni), cobalt (Co), titanium (Ti) and rare earth (neodymium Nd) butadiene rubber. Butadiene rubber is suitable for manufacturing automobile tires and cold-resistant products, as well as manufacturing cushioning materials, various rubber shoes, rubber cloth, tape and sponge rubber.

[0003] From the catalyst point of view, the neodymium-based catalyst system shows great potential and prospects in the polymerization process of butadiene rubber. In the rubber, the content of cis components is ≥98%, which is higher than any other catalyst system such as Ti, Co and Ni. Neodymium-based polybutadiene rubber has the most linear chain structure (no branching) and has the best tensile and hysteresis properties (low thermal accumulation). It also shows better wear resistance and higher resilience, which is very beneficial for applications in high-performance tires, golf balls and high-impact polystyrene (HIPS).

[0004] From the perspective of market application, my country's cis-1,4-butadiene rubber is mainly used in tires, shoemaking, high-impact polystyrene, and ABS resin modification. Among them, the demand of the tire manufacturing industry accounts for about 69% of the total demand, which is the largest consumption area of ​​cis-1,4-butadiene rubber; followed by the shoemaking industry, with a demand of about 10%, and the demand for plastic modification such as high-impact polystyrene and ABS resin accounts for about 9%. As the largest application area, the output of tires has continued to increase since 2014. According to data, my country's tire production in 2019 was 652 million, a year-on-year increase of 0.61%. Therefore, under the situation of continued strong downstream demand, my country's cis-1,4-butadiene rubber consumption has shown an overall growth trend. According to data, by the end of 2020, China's cis-1,4-butadiene rubber consumption rose to 1.236 million tons, a year-on-year increase of 5.37%.

[0005] The excellent yellowing performance of butyl rubber has a great impact on product application. Poor yellowing performance of rubber shortens the service life of the material and reduces the number of application scenarios of the material. According to research, there are four main reasons for the yellowing of butyl rubber:

[0006] 1. The influence of the rubber structure itself. There is bond energy between the chains of rubber macromolecules. When the energy provided is greater than the bond energy, the molecular chains are prone to activity concentration, which will cause the rubber to gradually degrade and turn yellow during use and storage.

[0007] 2. The influence of light (mainly ultraviolet rays). When the applied material absorbs light energy, the molecular chain at the absorption site will produce carbon-carbon bonds or carbon-hydrogen bonds, resulting in yellowing.

[0008] 3. The influence of heat and oxygen molecules. The applied materials will undergo oxidation reactions over time, and heat will accelerate the oxidation process of the materials. After the peroxide structure is formed, free radicals are easily formed, causing transparent, light-colored, and white materials to change color. Oxygen has the most significant destructive effect on unsaturated diene materials. In addition to activating oxidation, the effect of heat can also cause the breaking of carbon-carbon bonds and the rupture of double bonds, causing the material to yellow.

[0009] 4. The influence of other factors: Yellowing is also related to the additives added to the application materials, the presence of moisture, impurities and processing technology. Raw materials mixed with various chemical or mechanical impurities will reduce the stability of rubber. The reasons are relatively complex and need to be analyzed and investigated in a targeted manner.

[0010] At present, the research on the yellowing resistance of butadiene rubber includes: a formula of a secondary vulcanized white outsole and a preparation method thereof (CN 106349577 A), a yellowing and cracking resistant tire tread and a synthesis method thereof (CN 105348652 A), a yellowing resistant rubber for soles and a preparation method thereof (CN 112250919 A), a high temperature resistant and yellowing resistant colored tire tread rubber, a synthesis method and its use (CN 111944243 A), a highly weather-resistant white rubber sole and a preparation method thereof (CN109836630 B), and "Application of Liquid Composite Antiaging Agent XD-1680 in Butadiene Rubber".

[0011] The above method requires the addition of sulfide, or increases the dosage and cost of antioxidants to reduce the yellowing of butadiene rubber. Moreover, sulfide is a hazardous chemical, and the vulcanization process increases the safety cost of rubber preparation and the process is complicated. Summary of the invention

[0012] Purpose of the invention: The purpose of the present invention is to provide a method for preparing yellowing-resistant cis-butadiene rubber with low cost and simple process in view of the deficiencies of the prior art. The present invention uses butadiene as the main raw material, adopts a nickel catalyst system, and a multi-pot coordinated anion continuous solution polymerization process to prepare cis-butadiene rubber; the cis-butadiene rubber liquid obtained by polymerization with a catalyst is coagulated to obtain cis-butadiene rubber liquid, an anti-adhesive agent, an antioxidant and an anti-yellowing aid are added to carry out a coagulation reaction, and then the water-containing particles are dehydrated, dried and extruded to obtain a yellowing-resistant cis-butadiene rubber finished product.

[0013] Technical solution: The purpose of the present invention is achieved through the following technical solution:

[0014] The invention provides a method for preparing yellowing-resistant butadiene rubber. The butadiene rubber is prepared from the following raw materials in parts by weight: 100 parts of butadiene with a mass fraction of ≥99.0%, 100 parts of normal hexane, 5-20 parts of a reaction catalyst, 3-10 parts of an antioxidant, 10-20 parts of an anti-sticking agent and 5-15 parts of an anti-yellowing aid.

[0015] Preferably, the reaction catalyst is a mixture of nickel cyclohexaneate, isobutyl aluminum and boron trifluoride ether complex, prepared in a molar ratio of 1:1:1.

[0016] Preferably, the antioxidant is selected from antioxidant 1010 and antioxidant 168 in a compounding mass ratio of 1:1.

[0017] Preferably, the anti-sticking agent is selected from sodium acrylate.

[0018] Preferably, the anti-yellowing aid is selected from calcium carbonate and calcium stearate or a mixture of the two.

[0019] The present invention also provides a method for preparing yellowing-resistant butadiene rubber, comprising the following steps:

[0020] (1) Under nitrogen protection, a catalyst and an antioxidant are prepared, wherein the catalyst nickel cyclohexaneate, isobutyl aluminum and boron trifluoride ether complex are prepared in a molar ratio of 1:1:1 and are ready for use; and antioxidant 1010 and antioxidant 168 are prepared in a mass ratio of 1:1 and are ready for use;

[0021] (2) introducing 100 parts of butadiene with a mass fraction of ≥99.0% into a reaction kettle, adding 100 parts of n-hexane as a solvent and 5-20 parts of the catalyst prepared in step (1), and carrying out a sufficient polymerization reaction to obtain a polymerized rubber solution;

[0022] (3) mixing 3-10 parts of the antioxidant prepared in step (1) into the glue liquid after polymerization in step (2), inputting the mixture into a glue tank, adding 10-20 parts of an anti-adhesive agent and 5-15 parts of an anti-yellowing agent, and performing a coagulation reaction to obtain coagulated glue particles;

[0023] (4) buffering the mixture of the rubber particles and water after the coagulation in step (3) into a dehydration drying oven, controlling the drying temperature to be ≤100° C., and obtaining dried butadiene rubber particles.

[0024] Preferably, in step (2), the polymerization reaction time is 2-5 hours; the polymerization reaction temperature is 40-100° C.; and the polymerization reaction pressure is 0.06-0.12 MPa.

[0025] Preferably, in step (3), the condensation reaction temperature is 60-100° C., and the condensation reaction time is 1-2 hours.

[0026] Preferably, in step (4), the drying temperature is 50-90°C and the drying time is 0.5-1 hour.

[0027] Beneficial Effects

[0028] Utilizing the cis-1,4-butadiene rubber obtained by the preparation method of the present invention, the yellow index of the material decreases from 21.0 to below 10.0, and the oxidation induction time increases from 7.9 min to more than 20.0 min. While not affecting the mechanical properties of cis-1,4-butadiene rubber, the preparation method of cis-1,4-butadiene rubber of the present invention improves the yellowing resistance of the material, improves the durability of cis-1,4-butadiene rubber, prolongs the service life of cis-1,4-butadiene rubber materials, and broadens the application field of cis-1,4-butadiene rubber. Compared with the existing method, the preparation method of the present invention is simple to operate and has good economy. Specific embodiments

[0029] The present invention is further described in detail below using examples, but the present invention is not limited to these examples.

[0030] The yellowing performance testing method of the butadiene rubber of the present invention is implemented according to GB / T 39822-2021 "Determination of Plastic Yellowness Index and Its Change Value"; the oxidation induction time of butadiene rubber is implemented according to GB / T 19466.6-2009 "Plastic Differential Scanning Calorimetry (DSC) Part: Determination of Oxidation Induction Time (Isothermal OIT) and Oxidation Induction Temperature (Dynamic OIT)"; the Mooney viscosity test is implemented according to GB / T 1232.1-2016 "Unvulcanized Rubber Determination by Disc Shear Viscometer"; the ash test is implemented according to GB / T 4498-2017 "Determination of Rubber Ash"; the tensile strength and elongation at break are implemented according to GB T 8660-2018 "Evaluation Method for Solution-polymerized Butadiene Rubber (BR)".

[0031] Example 1

[0032] The catalyst and antioxidant are prepared under nitrogen protection, wherein the catalyst is a mixture of nickel cyclohexane, isobutyl aluminum and boron trifluoride ether complex, which is prepared in a molar ratio of 1:1:1 for standby use; the antioxidant is prepared by adding antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 for standby use; 100 parts of butadiene with a mass fraction of 99.5% are introduced into a reactor, 100 parts of n-hexane and 15 parts of catalyst are added, and the reaction is carried out for 4 hours; 3 parts of the prepared antioxidant are mixed into the polymerized glue solution, and then the solution is input into a glue tank, 10 parts of anti-sticking agent sodium acrylate and 5 parts of anti-yellowing auxiliary agent calcium carbonate are added, and a coagulation reaction is carried out for 1 hour; the mixture of coagulated rubber particles and water is buffered and pumped into a dehydration drying oven, the drying temperature is controlled to be 70°C, and the drying time is 1 hour to obtain dried butadiene rubber particles, which are transported to a briquetting machine for packaging to obtain butadiene rubber BR-1.

[0033] The Mooney viscosity of BR-1 is ML 1+4 45, ash content 0.20%, tensile strength 13.2MPa, elongation at break 330%, yellow index 10.0, oxidation induction time 20.0min, polymerization control conditions are shown in Table 1:

[0034] Table 1 Control conditions of polybutadiene rubber polymerization

[0035] Control parameters Actual value Control parameters Actual value Reactor temperature℃ 60 Condensation temperature ℃ 90 Reaction time 4.0 Coagulation pressure MPa 0.10 Reactor pressure MPa 0.06 Drying temperature℃ 70

[0036] Example 2

[0037] The catalyst and antioxidant are prepared under nitrogen protection, wherein the catalyst is a mixture of nickel cyclohexane, isobutyl aluminum and boron trifluoride ether complex, which is prepared in a molar ratio of 1:1:1 for standby use; the antioxidant is prepared by adding antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 for standby use; 100 parts of butadiene with a mass fraction of 99.5% are introduced into a reaction kettle, 100 parts of n-hexane and 10 parts of catalyst are added, and the reaction is carried out for 3.5 hours; 5 parts of the prepared antioxidant are mixed into the polymerized glue liquid, and then the mixture is input into a glue tank, 10 parts of anti-sticking agent sodium acrylate and 10 parts of anti-yellowing auxiliary agent calcium stearate are added, and a coagulation reaction is carried out for 2 hours; the mixture of coagulated rubber particles and water is buffered and pumped into a dehydration drying oven, the drying temperature is controlled to 70°C, and the mixture is dried for 1 hour to obtain dried butadiene rubber particles, which are transported to a briquetting machine for packaging to obtain butadiene rubber BR-2.

[0038] The Mooney viscosity of BR-2 is ML 1+4 47, ash content 0.19%, tensile strength 13.5MPa, elongation at break 348%, yellow index 9.8, oxidation induction time 21.7min, polymerization control conditions are shown in Table 2:

[0039] Table 2 Control conditions of polybutadiene rubber polymerization

[0040] Control parameters Actual value Control parameters Actual value Reactor temperature℃ 65 Condensation temperature ℃ 92 Reaction time 3.5 Coagulation pressure MPa 0.08 Reactor pressure MPa 0.08 Drying temperature℃ 70

[0041] Example 3

[0042] The catalyst and the antioxidant are prepared under nitrogen protection, wherein the catalyst is a mixture of nickel cyclohexane, isobutyl aluminum and boron trifluoride ether complex, which are prepared in a molar ratio of 1:1:1 and are ready for use; the antioxidant is prepared by adding antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 and is ready for use; 100 parts of butadiene with a mass fraction of 99.5% are introduced into a reaction kettle, 100 parts of n-hexane and 5 parts of catalyst are added, and the reaction is carried out for 5 hours; 5 parts of the prepared antioxidant are mixed into the polymerized glue solution, and then the solution is introduced into a glue tank, 20 parts of anti-sticking agent sodium acrylate and 15 parts of anti-yellowing additives (10 parts of calcium carbonate and 5 parts of calcium stearate) are added, and a coagulation reaction is carried out, and the coagulation reaction time is 1.5 hours; the mixture of coagulated rubber particles and water is buffered and pumped into a dehydration drying oven, the drying temperature is controlled to be 70°C, and the drying time is 0.8 hours, so as to obtain dried butadiene rubber particles, which are transported to a briquetting machine for packaging, and butadiene rubber BR-3 is obtained.

[0043] The Mooney viscosity of BR-3 is ML 1+4 42, ash content 0.18%, tensile strength 13.3MPa, elongation at break 339%, yellowness index 9.1, oxidation induction time 22.7min, polymerization reaction control conditions are shown in Table 3:

[0044] Table 3 Control conditions of polybutadiene rubber polymerization

[0045] Control parameters Actual value Control parameters Actual value Reactor temperature℃ 70 Condensation temperature ℃ 90 Reaction time 5 Coagulation pressure MPa 0.09 Reactor pressure MPa 0.09 Drying temperature℃ 70

[0046] Example 4

[0047] The catalyst and the antioxidant are prepared under nitrogen protection, wherein the catalyst is a mixture of nickel cyclohexane, isobutyl aluminum and boron trifluoride ether complex, which are prepared in a molar ratio of 1:1:1 and are ready for use; the antioxidant is prepared with antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 and is ready for use; 100 parts of butadiene with a mass fraction of 99.5% are introduced into a reaction kettle, 100 parts of n-hexane and 20 parts of catalyst are added, and the reaction is carried out for 4 hours; 10 parts of the prepared antioxidant are mixed into the polymerized glue solution, and then the solution is input into a glue tank, 15 parts of anti-sticking agent sodium acrylate and 10 parts of anti-yellowing additive (5 parts of calcium carbonate and 5 parts of calcium stearate) are added, and a coagulation reaction is carried out, and the coagulation reaction time is 1.5 hours; the mixture of coagulated rubber particles and water is buffered and pumped into a dehydration drying oven, the drying temperature is controlled to be 70°C, and the drying time is 1 hour, so as to obtain dried butadiene rubber particles, which are transported to a briquetting machine for packaging, and the butadiene rubber BR-4 is obtained.

[0048] The Mooney viscosity of BR-4 is ML 1+4 44, ash content 0.18%, tensile strength 13.9MPa, elongation at break 358%, yellow index 9.5, oxidation induction time 21.0min, polymerization reaction control conditions are shown in Table 4:

[0049] Table 4 Control conditions of polybutadiene rubber polymerization

[0050] Control parameters Actual value Control parameters Actual value Reactor temperature℃ 68 Condensation temperature ℃ 91 Reaction time 4.0 Coagulation pressure MPa 0.10 Reactor pressure MPa 0.06 Drying temperature℃ 70

[0051] Comparative Example 1

[0052] The difference from Example 1 is that no anti-yellowing aid is added during coagulation.

[0053] The catalyst and antioxidant are prepared under nitrogen protection, wherein the catalyst is a mixture of nickel cyclohexane, isobutyl aluminum and boron trifluoride ether complex, which is prepared in a molar ratio of 1:1:1 for standby use; the antioxidant is prepared by adding antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 for standby use; 100 parts of butadiene with a mass fraction of 99.5% are introduced into a reactor, 100 parts of n-hexane and 15 parts of catalyst are added, and the reaction is carried out for 4 hours, 3 parts of the prepared antioxidant are mixed into the polymerized glue liquid, and then input into a glue tank, 10 parts of anti-sticking agent sodium acrylate and 5 parts of anti-yellowing auxiliary agent calcium carbonate are added, and a condensation reaction is carried out for 1 hour; the mixture of condensed rubber particles and water is buffered and pumped into a dehydration drying oven, the drying temperature is controlled to be 70°C, the drying time is 1 hour, and the dried butadiene rubber particles are obtained, which are transported to a briquetting machine for packaging to obtain a butadiene rubber BR-01 with a Mooney viscosity of ML 1+4 45, ash content 0.20%, tensile strength 13.2MPa, elongation at break 337%, yellow index 17.1, oxidation induction time 15.2min, polymerization control conditions are shown in Table 5:

[0054] Table 5 Control conditions of polybutadiene rubber polymerization

[0055] Control parameters Actual value Control parameters Actual value Reactor temperature℃ 60 Condensation temperature ℃ 90 Reaction time 4.0 Coagulation pressure MPa 0.10 Reactor pressure MPa 0.06 Drying temperature℃ 70

[0056] Comparative Example 2

[0057] The difference from Example 2 is that no anti-yellowing aid is added during coagulation.

[0058] The catalyst and antioxidant are prepared under nitrogen protection, wherein the catalyst is a mixture of nickel cyclohexane, isobutyl aluminum and boron trifluoride ether complex, which is prepared in a molar ratio of 1:1:1 for standby use; the antioxidant is prepared by adding antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 for standby use; 100 parts of butadiene with a mass fraction of 99.5% are introduced into a reactor, 100 parts of n-hexane and 10 parts of catalyst are added, and the reaction is carried out for 4 hours, 5 parts of the prepared antioxidant are mixed into the polymerized glue liquid, and then the mixture is input into a glue tank, 10 parts of anti-sticking agent sodium acrylate are added, and a coagulation reaction is carried out for 2 hours; the mixture of coagulated rubber particles and water is buffered and pumped into a dehydration drying oven, the drying temperature is controlled to 70°C, and the mixture is dried for 1 hour to obtain dried butadiene rubber particles, which are transported to a briquetting machine for packaging to obtain a butadiene rubber BR-02 with a Mooney viscosity of ML1+4 47, ash content 0.19%, tensile strength 13.5MPa, elongation at break 340%, yellowness index 17.8, oxidation induction time 14.3min, polymerization reaction control conditions are shown in Table 6:

[0059] Table 6 Control conditions of polybutadiene rubber polymerization

[0060] Control parameters Actual value Control parameters Actual value Reactor temperature℃ 65 Condensation temperature ℃ 92 Reaction time 3.5 Coagulation pressure MPa 0.08 Reactor pressure MPa 0.08 Drying temperature℃ 70

[0061] Comparative Example 3

[0062] The difference from Example 3 is that no anti-yellowing aid is added during coagulation.

[0063] The catalyst and antioxidant are prepared under nitrogen protection, wherein the catalyst is a mixture of nickel cyclohexane, isobutyl aluminum and boron trifluoride ether complex, which is prepared in a molar ratio of 1:1:1 for standby use; the antioxidant is prepared by adding antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 for standby use; 100 parts of butadiene with a mass fraction of 99.5% are introduced into a reactor, 100 parts of n-hexane and 5 parts of catalyst are added, and the reaction is carried out for 5 hours, 5 parts of the prepared antioxidant are mixed into the polymerized glue liquid, and then the mixture is input into a glue tank, 20 parts of anti-sticking agent sodium acrylate are added, and a coagulation reaction is carried out, and the coagulation reaction time is 1.5 hours; the mixture of coagulated rubber particles and water is buffered and pumped into a dehydration drying oven, the drying temperature is controlled to be 70°C, and the drying time is 0.8 hours, to obtain dried butadiene rubber particles, which are transported to a briquetting machine for packaging, to obtain a butadiene rubber BR-03 with a Mooney viscosity of ML 1+4 42, ash content 0.18%, tensile strength 13.4MPa, elongation at break 344%, yellow index 18.2, oxidation induction time 14.7min, polymerization control conditions are shown in Table 7:

[0064] Table 7 Control conditions of polybutadiene rubber polymerization

[0065] Control parameters Actual value Control parameters Actual value Reactor temperature℃ 70 Condensation temperature ℃ 90 Reaction time 5 Coagulation pressure MPa 0.09 Reactor pressure MPa 0.09 Drying temperature℃ 70

[0066] Comparative Example 4

[0067] The difference from Example 4 is that no anti-yellowing aid is added during coagulation.

[0068] The catalyst and antioxidant were prepared under nitrogen protection. The catalyst was a mixture of nickel cyclohexane, isobutyl aluminum and boron trifluoride ether complex, prepared in a molar ratio of 1:1:1 for use; the antioxidant was prepared with antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 for use; 100 parts of butadiene with a mass fraction of 99.5% were passed into the reactor, 100 parts of n-hexane and 20 parts of catalyst were added, and the reaction was carried out for 4 hours. 10 parts of the prepared antioxidant were mixed into the polymerized glue solution, and then input into the glue tank, 5 parts of anti-sticking agent sodium acrylate were added, and a coagulation reaction was carried out for 1.5 hours; the mixture of coagulated rubber particles and water was buffered and pumped into a dehydration drying oven, the drying temperature was controlled at 70°C, and the drying time was 1 hour, and the dried butadiene rubber particles were obtained, which were transported to a briquetting machine for packaging to obtain a butadiene rubber BR-04. It was measured that the Mooney viscosity ML of BR-04 1+4 44, ash content 0.17%, tensile strength 13.7MPa, elongation at break 348%, yellow index 17.5, oxidation induction time 14.0min, polymerization reaction control conditions are shown in Table 8:

[0069] Table 8 Control conditions of polybutadiene rubber polymerization

[0070] Control parameters Actual value Control parameters Actual value Reactor temperature℃ 68 Condensation temperature ℃ 91 Reaction time 4.0 Coagulation pressure MPa 0.10 Reactor pressure MPa 0.06 Drying temperature℃ 70

[0071] Comparative Example 5

[0072] The performance of BR-9000, an existing butyl rubber product of Yangzi Petrochemical, was analyzed. The Mooney viscosity of BR-04 was ML 1+4 48, ash content 0.16%, tensile strength 13.6MPa, elongation at break 357%, yellowness index 21.0, oxidation induction time 7.9min.

[0073] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and details may be made without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A method for preparing yellowing-resistant butadiene rubber, characterized in that: The invention is prepared from the following raw materials in parts by weight: 100 parts of butadiene with a mass fraction of ≥99.0%, 100 parts of normal hexane, 5-20 parts of reaction catalyst, 3-10 parts of antioxidant, 10-20 parts of anti-sticking agent and 5-15 parts of anti-yellowing additive.

2. The preparation method according to claim 1, characterized in that: The reaction catalyst is a mixture of nickel cyclohexaneate, isobutyl aluminum and boron trifluoride ether complex, which is prepared in a molar ratio of 1:1:

1.

3. The preparation method according to claim 1, characterized in that: The antioxidant is selected from antioxidant 1010 and antioxidant 168 in a compounding mass ratio of 1:

1.

4. The preparation method according to claim 1, characterized in that: The anti-sticking agent is selected from sodium acrylate.

5. The preparation method according to claim 1, characterized in that: The anti-yellowing aid is selected from calcium carbonate and calcium stearate or a mixture of the two.

6. The preparation method according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Under nitrogen protection, a catalyst and an antioxidant are prepared, wherein the catalyst nickel cyclohexaneate, isobutyl aluminum and boron trifluoride ether complex are prepared in a molar ratio of 1:1:1 and are ready for use; and antioxidant 1010 and antioxidant 168 are prepared in a mass ratio of 1:1 and are ready for use; (2) introducing 100 parts of butadiene with a mass fraction of ≥99.0% into a reaction kettle, adding 100 parts of n-hexane as a solvent and 5-20 parts of the catalyst prepared in step (1), and carrying out a sufficient polymerization reaction to obtain a polymerized rubber solution; (3) mixing 3-10 parts of the antioxidant prepared in step (1) into the glue liquid after polymerization in step (2), inputting the mixture into a glue tank, adding 10-20 parts of an anti-adhesive agent and 5-15 parts of an anti-yellowing agent, and performing a coagulation reaction to obtain coagulated glue particles; (4) buffering the mixture of the rubber particles and water after the coagulation in step (3) into a dehydration drying oven, controlling the drying temperature to be ≤100° C., and obtaining dried butadiene rubber particles.

7. The preparation method according to claim 6, characterized in that: In step (2), the polymerization reaction time is 2-5 hours; the polymerization reaction temperature is 40-100° C.; and the polymerization reaction pressure is 0.06-0.12 MPa.

8. The preparation method according to claim 6, characterized in that: In step (3), the condensation reaction temperature is 60-100° C., and the condensation reaction time is 1-2 hours.

9. The preparation method according to claim 6, characterized in that: In step (4), the drying temperature is 50-90° C. and the drying time is 0.5-1 hour.