Rubber processing aid composition and preparation method thereof

Abstract

The invention discloses a rubber processing aid composition and a preparation method thereof, and belongs to the technical field of rubber processing, the rubber processing aid composition comprises the following raw materials by weight: 100 parts of a rubber matrix, 20-30 parts of ionic liquid grafted hyperbranched polyester, 6-7 parts of a multifunctional anti-aging agent, 2-4 parts of polyethylene wax, and 6-7 parts of microcrystalline wax; the multifunctional anti-aging agent is prepared from selenocystamine hydrochloride and allyl isothiocyanate through a reaction, the ionic liquid grafted hyperbranched polyester is 1-carboxymethyl-3-vinyl imidazole chlorine salt grafted hydroxyl-terminated hyperbranched polyester, and the rubber processing aid composition is applied to the rubber material processing process. According to the present invention, the rubber softening agent has characteristics of good rubber softening effect and good migration precipitation resistance, can effectively improve the dispersion effect of the carbon black or white carbon black and other reinforcing filler in the rubber matrix, can promote the vulcanization process, can easily obtain the high-performance rubber material, and further has good protection effect on the thermo-oxidative aging of the rubber material.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber processing, and in particular relates to a rubber processing aid composition and a preparation method thereof. Background Art

[0002] With the continuous development of the rubber industry, the requirements for rubber processing technology and comprehensive performance are getting higher and higher. The development of high-efficiency rubber additives required for high-performance composite materials is an important development direction of the rubber industry. Rubber additives can reduce rubber processing energy consumption, improve processing performance, and improve product quality. They are an important rubber additive. However, traditional processing additives often have certain defects in performance or cost.

[0003] For example, the patent application with application number 2014100180057 provides an anti-slip rubber softener and a preparation process thereof. The softener includes the following raw materials in parts by weight: 70-90 parts of cyclohexane oil, 10-30 parts of olefin mixed resin, and 0.1-1 part of aluminum chloride. The anti-slip rubber softener has the advantages of both environmentally friendly aromatic oil and environmentally friendly cyclohexane oil, and can improve the processing properties of rubber. However, this type of softener is actually a physical plasticizer with a low molecular weight and is easy to migrate and precipitate. On the one hand, it reduces the use efficiency of the additive, and on the other hand, it pollutes the environment. Summary of the invention

[0004] The object of the present invention is to provide a rubber processing aid composition to solve the problem of migration and precipitation of existing rubber processing aids.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A rubber processing aid composition comprises the following raw materials in parts by weight: 100 parts of a rubber matrix, 20-30 parts of an ionic liquid grafted hyperbranched polyester, 6-7 parts of a multifunctional antioxidant, 2-4 parts of polyethylene wax, and 6-7 parts of microcrystalline wax.

[0007] The ionic liquid grafted hyperbranched polyester is a 1-carboxymethyl-3-vinylimidazolium chloride grafted hydroxyl-terminated hyperbranched polyester.

[0008] The multifunctional antioxidant is prepared by reacting selenocystamine hydrochloride and allyl isothiocyanate.

[0009] Further, the ionic liquid grafted hyperbranched polyester is prepared by the following steps:

[0010] Add the terminal hydroxyl hyperbranched polyester to N,N-dimethylformamide, stir to dissolve, then add p-toluenesulfonic acid, continue stirring for 5-10 minutes, control the temperature at 110°C, and dropwise add a mixed solution a consisting of 1-carboxymethyl-3-vinyl imidazole chloride, hydroquinone and N,N-dimethylformamide under stirring. After the addition is complete, react at normal pressure and reduced pressure for 4 hours and 2 hours respectively, and finally remove DMF by distillation under reduced pressure.

[0011] Furthermore, the dosage ratio of the terminal hydroxyl hyperbranched polyester and 1-carboxymethyl-3-vinylimidazolium chloride is 5-11 g: 0.05-0.12 mol, the dosage of p-toluenesulfonic acid is 2-5% of the total mass of the terminal hydroxyl hyperbranched polyester and 1-carboxymethyl-3-vinylimidazolium chloride, and the dosage of hydroquinone is 1% of the mass of 1-carboxymethyl-3-vinylimidazolium chloride.

[0012] Furthermore, the terminal hydroxyl hyperbranched polyester is an aliphatic hyperbranched polyester with a molecular weight of 500-1100 and a hydroxyl number of 5-12 / mol.

[0013] Using terminal hydroxyl hyperbranched polyester as raw material, hydroquinone as polymerization inhibitor, and p-toluenesulfonic acid as catalyst, unsaturated olefinic bonds and imidazole chloride structures are introduced into the terminal of terminal hydroxyl hyperbranched polyester through esterification reaction to obtain ionic liquid grafted hyperbranched polyester. Based on the characteristics of high branching degree and low viscosity of hyperbranched polymer, ionic liquid grafted hyperbranched polyester can be used as a plasticizer to increase the flexibility and plasticity of styrene-butadiene rubber, and by reducing the interaction force between rubber molecular chains, the rubber is easier to flow and form during processing, thereby reducing the Mooney viscosity. In addition, there is an ion-dipole interaction between the positively charged nitrogen and the negatively charged chlorine on the imidazole ring of the ionic liquid grafted hyperbranched polyester and the hydroxyl group on the surface of the reinforcing filler, thereby weakening the interaction between the reinforcing filler particles and improving the dispersion effect of the reinforcing filler in the rubber matrix. At the same time, the π bond on the imidazole ring can interact with the π in the double bond on the rubber matrix to form a π-π interaction, which can enhance the interface interaction between the reinforcing filler and the rubber matrix, thereby improving the mechanical properties of the rubber product. Furthermore, the double bond structure of the ionic liquid grafted hyperbranched polyester can participate in the rubber vulcanization process, further improving the migration resistance of the ionic liquid grafted hyperbranched polyester.

[0014] Furthermore, the multifunctional antioxidant is prepared by the following steps:

[0015] At room temperature, add selenocystamine hydrochloride and anhydrous ethanol into a flask, stir to dissolve, then add dibutyltin dilaurate dropwise, then add allyl isothiocyanate dropwise while stirring, and complete the addition within 30 minutes. Heat to 50°C and stir to react for 4 hours, then cool to room temperature and continue to react for 48 hours. Finally, pour into cyclohexane, stir to obtain a precipitate, filter, wash the filter cake with cyclohexane, and dry.

[0016] Furthermore, the usage ratio of selenocystamine hydrochloride, anhydrous ethanol, dibutyltin dilaurate and allyl isothiocyanate is 60 mmol: 80-150 mL: 0.124 g: 125-130 mmol.

[0017] Selenocysteine ​​hydrochloride is used as a raw material, and a multifunctional antioxidant containing allyl, thiourea and selenium atoms is obtained by reacting with allyl isothiocyanate. The thiourea structure can effectively decompose hydroperoxides, terminate active oxygen free radicals, and inhibit the aging reaction process of rubber. Selenium has good reducing properties and can react with oxygen-containing free radicals to form stable compounds, effectively terminating the free radical chain reaction of rubber. The two coordinate to play an anti-aging role. In addition, the thiourea structure and selenium also have the effect of promoting rubber vulcanization, which is beneficial to improving the mechanical strength and heat-oxidation aging resistance of rubber products. Moreover, the multifunctional antioxidant also contains a double bond structure, can participate in the rubber vulcanization process, and has high migration resistance.

[0018] Furthermore, the rubber matrix is ​​styrene-butadiene rubber and / or natural rubber.

[0019] Furthermore, the melting point of the microcrystalline wax is 60-95°C.

[0020] Furthermore, the melting point of the polyethylene wax is 100-110°C.

[0021] The preparation method of the rubber processing aid composition comprises the following steps:

[0022] Add rubber matrix, ionic liquid grafted hyperbranched polyester, multifunctional antioxidant, polyethylene wax and microcrystalline wax into a mixer, control the rotation speed to 1000-3000 r / min, the initial temperature to 100-120°C, stir and mix for 0.5-1h to obtain a mixture, transfer the mixture to the feed trough of a granulator for extrusion, set the die pressure at 3-5 MPa, the temperature at 110-140°C, extrude and pelletize, control the diameter to 6 mm, the pelletizing length to 6-8 mm, cool, and obtain a rubber processing aid composition.

[0023] Beneficial effects of the present invention:

[0024] The invention provides a rubber processing aid composition, which is specifically composed of a rubber matrix, an ionic liquid grafted hyperbranched polyester, a multifunctional antioxidant, a polyethylene wax and a microcrystalline wax. When applied to a rubber material processing process, the composition has a good softening effect on the rubber, and due to its large molecular weight and reaction activity, it has good resistance to migration and precipitation, can effectively improve the dispersion effect of reinforcing fillers such as carbon black or white carbon black in the rubber matrix, promote the vulcanization process, and help to obtain a high-performance rubber material. In addition, the composition has a good protective effect on the thermal oxidation aging of the rubber material, and can significantly improve the aging resistance of the rubber product. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0026] In the present application, styrene-butadiene rubber, brand ESBR1502, was purchased from Sinopec Qilu Petrochemical, the terminal hydroxyl hyperbranched polyester was an aliphatic hyperbranched polyester, model H101 (hydroxyl number 5-7 / mol, molecular weight 500), model H102 (hydroxyl number 10-12 / mol, molecular weight 1100), purchased from Wuhan Hyperbranched Resin Technology Co., Ltd., microcrystalline wax, brand No. 75, was purchased from Dongguan County Dongsheng Beeswax Factory, and polyethylene wax was purchased from Longyun Chemical Co., Ltd.

[0027] B IPB produced by Guangxi Donglan New Materials Company, with the trade name B13, which is composed of 1,3-di-tert-butyl peroxide isopropylbenzene with a pure meta-structure, was selected for use in the following tests of the embodiments of the present invention.

[0028] Preparation Example 1

[0029] An ionic liquid grafted hyperbranched polyester is prepared by the following steps:

[0030] 5 g of terminal hydroxyl hyperbranched polyester was added to 100 mL of N, N-dimethylformamide, and 0.29 g of p-toluenesulfonic acid was added after stirring to dissolve, and stirring was continued for 5 min. The temperature was controlled at 110° C. and a mixed solution a consisting of 9.43 g of 1-carboxymethyl-3-vinyl imidazole chloride, 0.09 g of hydroquinone and 100 mL of N, N-dimethylformamide was added dropwise under stirring. After the addition was completed, the mixture was reacted under normal pressure and reduced pressure for 4 h and 2 h respectively, and finally the DMF was removed by distillation under reduced pressure. The terminal hydroxyl hyperbranched polyester is an aliphatic hyperbranched polyester with a model of H101.

[0031] Preparation Example 2

[0032] An ionic liquid grafted hyperbranched polyester is prepared by the following steps:

[0033] 11 g of terminal hydroxyl hyperbranched polyester was added to 120 mL of N, N-dimethylformamide, and 1.68 g of p-toluenesulfonic acid was added after stirring to dissolve, and stirring was continued for 10 min. The temperature was controlled at 110° C. and a mixed solution a consisting of 22.63 g of 1-carboxymethyl-3-vinyl imidazole chloride, 0.22 g of hydroquinone and 150 mL of N, N-dimethylformamide was added dropwise under stirring. After the addition was completed, the mixture was reacted under normal pressure and reduced pressure for 4 h and 2 h respectively, and finally DMF was removed by distillation under reduced pressure. The terminal hydroxyl hyperbranched polyester is an aliphatic hyperbranched polyester with a model of H102.

[0034] Comparative Example 1

[0035] An ionic liquid grafted hyperbranched polyester is different from Preparation Example 1 in that 1-carboxymethyl-3-vinyl imidazolium chloride in Preparation Example 1 is replaced by an equal amount of 1-carboxymethyl-3-methyl imidazolium chloride, and the remaining raw materials and preparation process are the same as Preparation Example 1.

[0036] Comparative Example 2

[0037] This comparative example is a hydroxyl-terminated hyperbranched polyester, specifically an aliphatic hyperbranched polyester, model number H101.

[0038] Comparative Example 3

[0039] The control example is naphthenic oil, model 4006, purchased from Zibo Xiangwang Chemical Co., Ltd.

[0040] Example 1

[0041] A rubber processing aid composition comprises the following raw materials in parts by weight: 100 parts of styrene-butadiene rubber, 20 parts of ionic liquid grafted hyperbranched polyester of Preparation Example 1, 6 parts of multifunctional antioxidant, 2 parts of polyethylene wax and 6 parts of microcrystalline wax.

[0042] The multifunctional antioxidant is prepared by the following steps:

[0043] At room temperature, add 60 mmol selenocystamine hydrochloride and 80-150 mL anhydrous ethanol into a flask, stir to dissolve, then add 0.124 g dibutyltin dilaurate dropwise, then add 125 mmol allyl isothiocyanate dropwise while stirring, and complete the addition within 30 min. Heat to 50 ° C and stir to react for 4 h, then cool to room temperature and continue to react for 48 h. Finally, pour into cyclohexane, stir to obtain a precipitate, filter, wash the filter cake with cyclohexane, and dry.

[0044] The preparation method of the rubber processing aid composition comprises the following steps:

[0045] Add styrene-butadiene rubber, ionic liquid grafted hyperbranched polyester, multifunctional antioxidant, polyethylene wax and microcrystalline wax into a mixer, control the speed to 1000 r / min, the initial temperature to 100°C, stir and mix for 0.5 h to obtain a mixture, transfer the mixture to the feed trough of a granulator for extrusion, the die pressure is 3 MPa, the temperature is 110°C, extrusion pelletizing, control the diameter to 6 mm, the pelletizing length to 6-8 mm, cool, and obtain a rubber processing aid composition.

[0046] Example 2

[0047] A rubber processing aid composition comprises the following raw materials in parts by weight: 100 parts of styrene-butadiene rubber, 25 parts of ionic liquid grafted hyperbranched polyester of Preparation Example 2, 6.5 parts of multifunctional antioxidant, 3 parts of polyethylene wax, and 6.5 parts of microcrystalline wax.

[0048] The multifunctional antioxidant is prepared by the following steps:

[0049] At room temperature, add 60 mmol selenocystamine hydrochloride and 130 mL anhydrous ethanol into a flask, stir to dissolve, then add 0.124 g dibutyltin dilaurate dropwise, then add 128 mmol allyl isothiocyanate dropwise while stirring, and complete the addition within 30 min. Heat to 50 °C and stir to react for 4 h, then cool to room temperature and continue to react for 48 h. Finally, pour into cyclohexane, stir to obtain a precipitate, filter, wash the filter cake with cyclohexane, and dry.

[0050] The preparation method of the rubber processing aid composition comprises the following steps:

[0051] Add styrene-butadiene rubber, ionic liquid grafted hyperbranched polyester, multifunctional antioxidant, polyethylene wax and microcrystalline wax into a mixer, control the speed to 2000 r / min, the initial temperature to 110°C, stir and mix for 0.8 h to obtain a mixture, transfer the mixture to the feed trough of a granulator for extrusion, the die pressure is 4 MPa, the temperature is 120°C, extrusion pelletizing, control the diameter to 6 mm, the pelletizing length to 6-8 mm, cool, and obtain a rubber processing aid composition.

[0052] Example 3

[0053] A rubber processing aid composition comprises the following raw materials in parts by weight: 100 parts of styrene-butadiene rubber, 30 parts of ionic liquid grafted hyperbranched polyester of Preparation Example 2, 7 parts of multifunctional antioxidant, 4 parts of polyethylene wax and 7 parts of microcrystalline wax.

[0054] The multifunctional antioxidant is prepared by the following steps:

[0055] At room temperature, add 60 mmol selenocystamine hydrochloride and 150 mL anhydrous ethanol into a flask, stir to dissolve, then add 0.124 g dibutyltin dilaurate dropwise, then add 130 mmol allyl isothiocyanate dropwise while stirring, and complete the addition within 30 min. Heat to 50 °C and stir to react for 4 h, then cool to room temperature and continue to react for 48 h. Finally, pour into cyclohexane, stir to obtain a precipitate, filter, wash the filter cake with cyclohexane, and dry.

[0056] The preparation method of the rubber processing aid composition comprises the following steps:

[0057] Add styrene-butadiene rubber, ionic liquid grafted hyperbranched polyester, multifunctional antioxidant, polyethylene wax and microcrystalline wax into a mixer, control the speed to 3000 r / min, the initial temperature to 120°C, stir and mix for 1 hour to obtain a mixture, transfer the mixture to the feed trough of a granulator for extrusion, the die pressure is 5 MPa, the temperature is 140°C, extrusion pelletizing, control the diameter to 6 mm, the pelletizing length to 6-8 mm, cool, and obtain a rubber processing aid composition.

[0058] Comparative Example 1

[0059] A rubber processing aid composition is disclosed. Compared with Example 1, the ionic liquid grafted hyperbranched polyester in Example 1 is replaced with an equal mass of the product prepared in Control Example 1, and the remaining raw materials and preparation process are the same as in Example 1.

[0060] Comparative Example 2

[0061] A rubber processing aid composition is disclosed. Compared with Example 1, the ionic liquid grafted hyperbranched polyester in Example 1 is replaced with an equal mass of the substance in Control Example 2, and the remaining raw materials and preparation process are the same as in Example 1.

[0062] Comparative Example 3

[0063] A rubber processing aid composition is disclosed. Compared with Example 1, the ionic liquid grafted hyperbranched polyester in Example 1 is replaced with an equal mass of the substance in Control Example 3, and the remaining raw materials and preparation process are the same as in Example 1.

[0064] Comparative Example 4

[0065] A rubber processing aid composition is disclosed. Compared with Example 1, the multifunctional antioxidant in Example 1 is replaced by a rubber antioxidant 4010NA of equal mass, and the remaining raw materials and preparation process are the same as those in Example 1.

[0066] The rubber processing aid compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were subjected to performance tests, and the test process was as follows:

[0067] 100 parts by weight of styrene-butadiene rubber, 50 parts by weight of carbon black N330, 3 parts by weight of zinc oxide, 1 part by weight of stearic acid and 2 parts by weight of a rubber processing aid composition were added to an internal mixer and mixed at 90° C. for 7 minutes. Then, 1.75 parts by weight of BIPB and 1 part by weight of accelerator TBBS (N-tert-butyl-2-benzothiazolesulfonamide) were added to the mixture and transferred to an open mixer for mixing at a mixing temperature of 45° C. for 12 minutes to obtain a mixed rubber blank. Then, the mixed rubber blank was vulcanized in a 50T plate vulcanizer at 160° C. for 35 minutes to obtain vulcanized rubber with a thickness of 2 mm.

[0068] The vulcanized rubber prepared by the rubber processing aid composition prepared in Examples 1 to 3 and Comparative Examples 1 to 4 was tested. (1) Processing performance of the composite material: tested by using the RPA2000 rubber processing analyzer of Alpha Technology, USA. The test adopts the strain scanning mode, the test temperature is 60°C, the scanning frequency is 1Hz, and the strain scanning range is 0.7%-200%; (2) Mooney viscosity evaluation: According to GB1232.1-2016 standard, the test is conducted by using the GT-7080-S2 Mooney viscosity machine (produced by Taiwan High Speed ​​Rail Corporation of China), the temperature is 100°C, and the Mooney test time is 1+4min. The results are shown in Table 1:

[0069] Table 1

[0070]

[0071] Note: T s2 is the scorch time, T c90 It is the positive vulcanization time.

[0072] By comparing the vulcanization characteristic data of the rubber products prepared in Examples 1-3 and Comparative Examples 1-4 in Table 1, it can be seen that the T s2 The values ​​are higher than those of Comparative Examples 1-4, while T c90 -T s2 The values ​​are all lower than those of comparative examples 1-4, indicating that the processing aid prepared by the present invention has a good effect on improving the processing safety and vulcanization speed of the rubber compound, and can reduce the Mooney viscosity and improve the processing performance of the rubber;

[0073] (3) Extraction resistance: Methanol was used as the solvent and the sample was placed in a Soxhlet extractor for extraction. After 24 hours of extraction, the sample was taken out and placed in a vacuum drying oven at 60°C to dry to constant weight. The extraction mass loss percentage of the sample was calculated by the formula P = (m2-m1) / m1×100%, where m1 and m2 were the masses of the sample before and after extraction, respectively. (4) Mechanical properties of composite materials: Referring to the standard ASTM D412-15a, the dumbbell-shaped sample was tested for utilization performance using a universal testing machine of U I-2080 manufactured by Taiwan Youken Technology Co., Ltd., China. The tensile rate was 500 mm / min. Five sample strips were used for each test and the average value was taken as the final test result. (5) Accelerated thermal oxidative aging test: Referring to the standard ASTMD573-04 (2015), an accelerated thermal oxidative aging test chamber of model UA-2071A manufactured by Taiwan Youken Technology Co., Ltd., China was used for accelerated aging test. The dumbbell-shaped rubber tensile specimens were hung at intervals on the rotating frame of the hot oxygen aging box, the aging temperature was 100°C, the aging time was 72h, and the specimens were taken out according to the set aging time to measure the tensile strength retention rate; the results are shown in Table 2:

[0074] Table 2

[0075]

[0076] It can be seen from the extraction mass loss percentage test results in Table 2 that, compared with Comparative Examples 1-4, the migration and precipitation amount of the additives in the rubber products of Examples 1-3 is lower, indicating that the rubber processing aid composition prepared by the present invention has better migration resistance; the tensile strength and elongation at break test results show that the rubber products obtained by the rubber processing aid composition prepared by the present invention have better mechanical properties, and the tensile strength retention test results show that the rubber products prepared by the present invention have better anti-aging performance.

[0077] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rubber processing aid composition, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of a rubber matrix, 20-30 parts of an ionic liquid grafted hyperbranched polyester, 6-7 parts of a multifunctional antioxidant, 2-4 parts of polyethylene wax and 6-7 parts of microcrystalline wax; the multifunctional antioxidant is prepared by reacting selenocystamine hydrochloride and allyl isothiocyanate.

2. A rubber processing aid composition according to claim 1, characterized in that: The ionic liquid grafted hyperbranched polyester is a 1-carboxymethyl-3-vinylimidazolium chloride grafted hydroxyl-terminated hyperbranched polyester.

3. A rubber processing aid composition according to claim 1, characterized in that: The ionic liquid grafted hyperbranched polyester is prepared by the following steps: Add the terminal hydroxyl hyperbranched polyester to N,N-dimethylformamide, stir to dissolve, then add p-toluenesulfonic acid, continue stirring for 5-10 minutes, control the temperature at 110°C, and dropwise add a mixed solution a consisting of 1-carboxymethyl-3-vinyl imidazole chloride, hydroquinone and N,N-dimethylformamide under stirring. After the addition is complete, react at normal pressure and reduced pressure for 4 hours and 2 hours respectively, and finally remove DMF by distillation under reduced pressure.

4. A rubber processing aid composition according to claim 3, characterized in that: The dosage ratio of the terminal hydroxyl hyperbranched polyester and 1-carboxymethyl-3-vinylimidazole chloride is 5-11 g: 0.05-0.12 mol, the dosage of p-toluenesulfonic acid is 2-5% of the total mass of the terminal hydroxyl hyperbranched polyester and 1-carboxymethyl-3-vinylimidazole chloride, and the dosage of hydroquinone is 1% of the mass of 1-carboxymethyl-3-vinylimidazole chloride.

5. A rubber processing aid composition according to claim 3, characterized in that: The terminal hydroxyl hyperbranched polyester is an aliphatic hyperbranched polyester with a molecular weight of 500-1100 and a hydroxyl number of 5-12 / mol.

6. A rubber processing aid composition according to claim 1, characterized in that: The multifunctional antioxidant is prepared by the following steps: At room temperature, add selenocystamine hydrochloride and anhydrous ethanol into a flask, stir to dissolve, then add dibutyltin dilaurate dropwise, then add allyl isothiocyanate dropwise while stirring, and complete the addition within 30 minutes. Heat to 50°C and stir to react for 4 hours, then cool to room temperature and continue to react for 48 hours. Finally, pour into cyclohexane, stir to obtain a precipitate, filter, wash the filter cake with cyclohexane, and dry.

7. A rubber processing aid composition according to claim 6, characterized in that: The dosage ratio of selenocystamine hydrochloride, anhydrous ethanol, dibutyltin dilaurate and allyl isothiocyanate is 60mmol:80-150mL:0.124g:125-130mmo l.

8. A rubber processing aid composition according to claim 6, characterized in that: The rubber matrix is ​​styrene-butadiene rubber and / or natural rubber.

9. A method for preparing the rubber processing aid composition according to any one of claims 1 to 8, characterized in that: The following steps are involved: Add rubber matrix, ionic liquid grafted hyperbranched polyester, multifunctional antioxidant, polyethylene wax and microcrystalline wax into a mixer, with an initial temperature of 100-120°C, stir and mix for 0.5-1h to obtain a mixture, transfer the mixture to the feed trough of a granulator for extrusion, with a die pressure of 3-5MPa and a temperature of 110-140°C, extrude and pelletize, and cool to obtain a rubber processing aid composition.

10. The method for preparing the rubber processing aid composition according to claim 9, characterized in that: During the pelletizing process, the diameter is controlled at 6mm and the pelletizing length is 6-8mm.

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