A rubber processing aid composition and a method for its preparation

Abstract

The application discloses a rubber processing aid composition and a preparation method thereof, and belongs to the technical field of rubber processing, and comprises the following raw materials in parts by weight: 100 parts of a rubber matrix, 20-30 parts of ionic liquid grafted hyperbranched polyester, 6-7 parts of multifunctional antioxidant, 2-4 parts of polyethylene wax, and 6-7 parts of microcrystalline wax; the multifunctional antioxidant is prepared by the reaction of selenocystamine hydrochloride and allyl isothiocyanate; and the ionic liquid grafted hyperbranched polyester is 1-carboxymethyl-3-vinylimidazole chloride salt grafted hydroxyl-terminated hyperbranched polyester. When the rubber processing aid composition is applied to a rubber material processing process, the rubber is softened, migration and precipitation resistance is good, the dispersion effect of reinforcing fillers such as carbon black or white carbon black in the rubber matrix can be effectively improved, the vulcanization process is promoted, high-performance rubber materials can be obtained, and the rubber material has good heat and oxygen aging protection effect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rubber processing, and particularly relates to a rubber processing aid composition and a preparation method thereof. BACKGROUND

[0002] With the continuous development of the rubber industry, the requirements for rubber processing technology and comprehensive performance are higher and higher, and the development of high-performance composite materials requires high-efficiency rubber additives, which is an important development direction of the current rubber industry. Rubber additives can not only reduce the energy consumption of rubber processing and improve the processing performance, but also improve the product quality, and are an important rubber additive. However, the traditional processing aid has certain defects in performance or cost.

[0003] For example, the patent application with the application number 2014100180057 provides an anti-wet rubber softener and a preparation process thereof. The softener includes the following raw materials in weight percentage: naphthenic oil 70-90 parts, olefin mixed resin 10-30 parts, and aluminum chloride 0.1-1 part. The anti-wet rubber softener has the advantages of environmental protection aromatic hydrocarbon oil and environmental protection naphthenic oil, and can improve the processing performance of rubber. However, this kind of softener is actually a physical plasticizer, and has a low molecular weight and is easy to migrate and precipitate, which reduces the use efficiency of the additive on the one hand, and pollutes the environment on the other hand. SUMMARY

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

[0005] The purpose of the present application can be achieved by the following technical solutions:

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

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

[0008] The multifunctional antioxidant is prepared by the reaction of selenocystamine hydrochloride and allyl isothiocyanate.

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

[0010] The hydroxyl-terminated hyperbranched polyester is added into N,N-dimethylformamide, stirred and dissolved, then p-toluenesulfonic acid is added, stirring is continued for 5-10 min, the temperature is controlled at 110℃, and then the mixed solution a composed of 1-carboxymethyl-3-vinylimidazole chloride, hydroquinone and N,N-dimethylformamide is added dropwise under stirring, after the dropwise addition is completed, normal pressure and reduced pressure reactions are carried out for 4 h and 2 h respectively, and finally DMF is removed by distillation under reduced pressure.

[0011] Further, the ratio of the amount of the hydroxyl-terminated hyperbranched polyester to the amount of 1-carboxymethyl-3-vinylimidazole chloride is 5-11 g: 0.05-0.12 mol, and the amount of p-toluenesulfonic acid is 2-5% of the mass sum of the hydroxyl-terminated hyperbranched polyester and 1-carboxymethyl-3-vinylimidazole chloride, and the amount of hydroquinone is 1% of the mass of 1-carboxymethyl-3-vinylimidazole chloride.

[0012] Further, the hydroxyl-terminated hyperbranched polyester is an aliphatic hyperbranched polyester, the molecular weight is 500-1100, and the number of hydroxyl groups is 5-12 per mol.

[0013] The hydroxyl-terminated hyperbranched polyester is used as raw material, hydroquinone is used as polymerization inhibitor, and p-toluenesulfonic acid is used as catalyst, and then an unsaturated olefin bond and imidazole chloride structure are introduced into the end of the hydroxyl-terminated 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 polymers, the 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 the molecular chains of the rubber, the rubber is more easily flowed and formed during the processing, thereby reducing the Mooney viscosity. In addition, there is an ionic dipole interaction between the positively charged nitrogen on the imidazole ring of the ionic liquid grafted hyperbranched polyester and the negatively charged chlorine and the hydroxyl groups 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 have π-π interaction with the π in the double bond on the rubber matrix, which can enhance the interfacial 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 vulcanization process of the rubber, thereby further improving the migration resistance of the ionic liquid grafted hyperbranched polyester.

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

[0015] Selenocystamine hydrochloride and anhydrous ethanol are added into a flask at room temperature, stirred and dissolved, then dibutyltin dilaurate is added dropwise, after that, isothiocyanate is added dropwise while stirring, the dropwise addition is completed within 30 min, the temperature is increased to 50℃, and then the reaction is carried out for 4 h while stirring, after that, the temperature is decreased to room temperature, and the reaction is continued for 48 h, finally, cyclohexane is poured in, stirring is carried out to obtain a precipitate, suction filtration is carried out, the filter cake is washed with cyclohexane, and then drying is carried out.

[0016] Further, the selenium cystamine hydrochloride, anhydrous ethanol, dibutyltin dilaurate and allyl isothiocyanate are in a ratio of 60mmol: 80-150mL: 0.124g: 125-130mmol.

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

[0018] Further, the rubber matrix is styrene butadiene rubber and / or natural rubber.

[0019] Further, the melting point of the microcrystalline wax is 60-95℃.

[0020] Further, the melting point of the polyethylene wax is 100-110℃.

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

[0022] The rubber matrix, ionic liquid grafted hyperbranched polyester, multifunctional antioxidant, polyethylene wax and microcrystalline wax are added to a stirrer, the rotation speed is controlled to be 1000-3000r / min, the initial temperature is controlled to be 100-120℃, and the mixture is stirred and mixed for 0.5-1h to obtain a mixture. The mixture is transferred to a granulator feeding slot for extrusion, the die head pressure is controlled to be 3-5MPa, the temperature is controlled to be 110-140℃, the extrusion is cut into particles, the diameter is controlled to be 6mm, the length of the cut particles is controlled to be 6-8mm, and the particles are cooled to obtain the rubber processing aid composition.

[0023] The rubber processing aid composition has the following advantages:

[0024] The rubber processing aid composition provided by the application is composed of a rubber matrix, ionic liquid grafted hyperbranched polyester, multifunctional antioxidant, polyethylene wax and microcrystalline wax. When the rubber processing aid composition is applied to the rubber material processing process, it has a good softening effect on the rubber, and has good migration resistance due to the large molecular weight and the reaction activity. The dispersion effect of reinforcing fillers such as carbon black or white carbon black in the rubber matrix can be effectively improved, the vulcanization process is promoted, and high-performance rubber materials can be obtained. In addition, the rubber material has good heat and oxygen aging protection effect, and the aging resistance of the rubber product can be significantly improved. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0026] The styrene butadiene rubber in the present application is ESBR1502, purchased from Qilu Petrochemical, the hydroxyl-terminated hyperbranched polyester is aliphatic hyperbranched polyester, model H101 (hydroxyl number 5-7 per mol, molecular weight 500), model H102 (hydroxyl number 10-12 per mol, molecular weight 1100), purchased from Wuhan Hyperbranched Resin Technology Co., Ltd., the microcrystalline wax is No. 75, purchased from Dongguang Dongsheng Wax Factory, and the polyethylene wax is purchased from Longyun Chemical Co., Ltd.

[0027] The BIPB produced by Guangxi Donglan New Material Co., Ltd. is selected, the commercial brand is B13, which is composed of pure meta-structure 1.3-di-tert-butyl peroxide isopropyl benzene, and is used in the following embodiments of the present application.

[0028] Preparation Example 1

[0029] A kind of ionic liquid grafted hyperbranched polyester is prepared by the following steps:

[0030] 5 g of hydroxyl-terminated hyperbranched polyester is added to 100 mL of N,N-dimethylformamide, after stirring and dissolving, 0.29 g of p-toluenesulfonic acid is added, and stirring is continued for 5 min, the temperature is controlled at 110℃, and a mixed solution a composed of 9.43 g of 1-carboxymethyl-3-vinylimidazole chloride, 0.09 g of hydroquinone and 100 mL of N,N-dimethylformamide is added dropwise under stirring conditions, after the dropwise addition is completed, the reaction is carried out under normal pressure and reduced pressure for 4 h and 2 h respectively, and finally the DMF is removed by reduced pressure distillation, the hydroxyl-terminated hyperbranched polyester is aliphatic hyperbranched polyester, model H101.

[0031] Preparation Example 2

[0032] A kind of ionic liquid grafted hyperbranched polyester is prepared by the following steps:

[0033] Into 120 mL of N,N-dimethylformamide, 11 g of hydroxyl-terminated hyperbranched polyester was added, and after stirring and dissolving, 1.68 g of p-toluenesulfonic acid was added, and stirring was continued for 10 min. The temperature was controlled at 110°C, and a mixed solution a composed of 22.63 g of 1-carboxymethyl-3-vinylimidazole chloride, 0.22 g of hydroquinone, and 150 mL of N,N-dimethylformamide was added dropwise under stirring. After the dropwise addition was completed, normal pressure and reduced pressure reactions were carried out for 4 h and 2 h, respectively, and finally, the DMF was removed by distillation under reduced pressure. The hydroxyl-terminated hyperbranched polyester was an aliphatic hyperbranched polyester, and the model number was H102.

[0034] Comparative Example 1

[0035] An ionic liquid grafted hyperbranched polyester, compared with Preparation Example 1, differs in that the 1-carboxymethyl-3-vinylimidazole chloride in Preparation Example 1 is replaced by an equal amount of 1-carboxymethyl-3-methylimidazole chloride, and the rest of the raw materials and the preparation process are the same as those in Preparation Example 1.

[0036] Comparative Example 2

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

[0038] Comparative Example 3

[0039] This comparative example is a naphthenic oil, and the model number is 4006, purchased from Zibo Oukuan Chemical Co., Ltd.

[0040] Example 1

[0041] A rubber processing aid composition includes the following raw materials by weight: 100 parts of styrene-butadiene rubber, 20 parts of the ionic liquid grafted hyperbranched polyester of Preparation Example 1, 6 parts of a 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, 60 mmol of selenocystamine hydrochloride and 80-150 mL of anhydrous ethanol were added to a flask, and after stirring and dissolving, 0.124 g of dibutyltin dilaurate was added dropwise, followed by the dropwise addition of 125 mmol of allyl isothiocyanate while stirring. The dropwise addition was completed within 30 min, and the temperature was raised to 50°C for stirring reaction for 4 h. Then the temperature was lowered to room temperature for further reaction for 48 h. Finally, it was poured into cyclohexane, stirred to obtain a precipitate, filtered, and the filter cake was washed with cyclohexane and then dried.

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

[0045] Stirring machine is added with styrene-butadiene rubber, ionic liquid grafted hyperbranched polyester, multifunctional antioxidant, polyethylene wax and microcrystalline wax, the rotating speed is controlled at 1000 r / min, the initial temperature is 100℃, the mixture is stirred for 0.5 h to obtain a mixed material, the mixed material is transferred to the feeding trough of a granulator for extrusion, the die head pressure is 3 MPa, the temperature is 110℃, the extrusion is cut into particles, the diameter is controlled at 6 mm, the length of the cut particles is 6-8 mm, and the particles are cooled to obtain a rubber processing aid composition.

[0046] Example 2

[0047] A rubber processing aid composition comprises the following raw materials by weight: 100 parts of styrene-butadiene rubber, 25 parts of ionic liquid grafted hyperbranched polyester prepared in 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, 60 mmol of selenocystamine hydrochloride and 130 mL of anhydrous ethanol are added to a flask, stirred and dissolved, then 0.124 g of dibutyltin dilaurate is added dropwise, followed by the addition of 128 mmol of allyl isothiocyanate dropwise while stirring, and the addition is completed within 30 min. The temperature is raised to 50℃ and the reaction is stirred for 4 h, then the temperature is lowered to room temperature and the reaction is continued for 48 h. Finally, the mixture is poured into cyclohexane, stirred to obtain a precipitate, filtered, and the filter cake is washed with cyclohexane and dried.

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

[0051] Stirring machine is added with styrene-butadiene rubber, ionic liquid grafted hyperbranched polyester, multifunctional antioxidant, polyethylene wax and microcrystalline wax, the rotating speed is controlled at 2000 r / min, the initial temperature is 110℃, the mixture is stirred for 0.8 h to obtain a mixed material, the mixed material is transferred to the feeding trough of a granulator for extrusion, the die head pressure is 4 MPa, the temperature is 120℃, the extrusion is cut into particles, the diameter is controlled at 6 mm, the length of the cut particles is 6-8 mm, and the particles are cooled to obtain a rubber processing aid composition.

[0052] Example 3

[0053] A rubber processing aid composition comprises the following raw materials by weight: 100 parts of styrene-butadiene rubber, 30 parts of ionic liquid grafted hyperbranched polyester prepared in 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] Into a flask, 60 mmol of selenocystamine hydrochloride and 150 mL of anhydrous ethanol were added at room temperature, and after stirring and dissolving, 0.124 g of dibutyltin dilaurate was added dropwise, followed by the addition of 130 mmol of allyl isothiocyanate dropwise while stirring, and the addition was completed within 30 min. The reaction was stirred at 50°C for 4 h, and then the temperature was lowered to room temperature for continuous reaction for 48 h. Finally, it was poured into cyclohexane, and the precipitate was obtained by stirring and filtration. The filter cake was washed with cyclohexane and dried to obtain the product.

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

[0057] The butadiene styrene rubber, the ionic liquid grafted hyperbranched polyester, the multifunctional antioxidant, the polyethylene wax and the microcrystalline wax were added into a blender, and the rotation speed was controlled at 3000 r / min, the initial temperature was 120°C, and the mixture was stirred and mixed for 1 h to obtain a mixture. The mixture was transferred to a granulator feeding trough for extrusion, the die head port pressure was 5 MPa, the temperature was 140°C, the diameter was controlled at 6 mm, the length of the cut particles was 6-8 mm, and the rubber processing aid composition was obtained after cooling.

[0058] Comparative Example 1

[0059] A rubber processing aid composition, compared with Example 1, the ionic liquid grafted hyperbranched polyester in Example 1 was replaced by the same amount of the product prepared in Comparative Example 1, and the remaining raw materials and preparation process were the same as those in Example 1.

[0060] Comparative Example 2

[0061] A rubber processing aid composition, compared with Example 1, the ionic liquid grafted hyperbranched polyester in Example 1 was replaced by the same amount of the product in Comparative Example 2, and the remaining raw materials and preparation process were the same as those in Example 1.

[0062] Comparative Example 3

[0063] A rubber processing aid composition, compared with Example 1, the ionic liquid grafted hyperbranched polyester in Example 1 was replaced by the same amount of the product in Comparative Example 3, and the remaining raw materials and preparation process were the same as those in Example 1.

[0064] Comparative Example 4

[0065] A rubber processing aid composition, compared with Example 1, the multifunctional antioxidant in Example 1 was replaced by the same amount of rubber antioxidant 4010NA, and the remaining raw materials and preparation process were the same as those in Example 1.

[0066] The rubber processing aid compositions prepared in Examples 1-3 and Comparative Examples 1-4 were tested for performance, and the testing process was as follows:

[0067] 100 parts by weight of butadiene styrene 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 rubber processing aid composition were added into the internal mixer, mixed at 90℃ for 7min, then 1.75 parts by weight of BIPB, 1 part by weight of accelerator TBBS (N-tert-butyl-2-benzothiazolesulfenamide) were added into the above mixture and transferred to the open mill for mixing, the mixing temperature was 45℃, the time was 12min, the raw rubber was obtained, then the raw rubber was vulcanized in a 50T flat vulcanizing machine at 160℃, the vulcanization time was 35min, and the vulcanized rubber with a thickness of 2mm was obtained;

[0068] The vulcanized rubber prepared by the rubber processing aid composition prepared in Example 1-Example 3 and Comparative Example 1-Comparative Example 4 was tested, (1) the processing performance of the composite material: tested by using the RPA2000 type rubber processing analyzer of American Alpha Science Company, the test was carried out in strain scanning mode, the test temperature was 60℃, the scanning frequency was 1Hz, and the strain scanning range was 0.7%-200%; (2) the evaluation of Mooney viscosity: tested according to GB1232.1-2016 standard by using GT-7080-S2 type Mooney viscometer (produced by Taiwan Gaoqi Company), the temperature was 100℃, and the Mooney test time was 1+4min. The results are shown in Table 1:

[0069] Table 1

[0070]

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

[0072] It can be seen from the comparison of the vulcanization characteristic data of the rubber products prepared in Example 1-3 and Comparative Example 1-4 in Table 1 that the T s2 values of the products of Example 1-3 are higher than those of Comparative Example 1-4, and the T c90 -T s2 values are all lower than those of the product of Comparative Example 1-4, which shows that the processing aid prepared in the application has good effect in 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: Using methanol as solvent, the sample to be tested was placed in a Soxhlet extractor for extraction. After 24 hours of extraction, the sample was taken out and dried in a vacuum drying oven at 60°C until constant weight. The percentage of sample mass loss was calculated by formula P = (m2-m1) / m1 × 100%, where m1 and m2 are the mass of the sample before and after extraction, respectively. (4) Mechanical properties of composite materials: Referring to standard ASTM D412-15a, the dumbbell-shaped sample was tested using a UA-2080 universal testing machine from Taiwan Youken Technology Co., Ltd. The tensile rate was 500 mm / min. Five samples were used in each test group, and the average value was taken as the final test result. (5) Accelerated thermo-oxidative aging test: Referring to standard ASTM D573-04 (2015), the accelerated aging test was conducted using an UA-2071A accelerated thermo-oxidative aging test chamber from Taiwan Youken Technology Co., Ltd. Dumbbell-shaped rubber tensile specimens were suspended at intervals on a rotating frame in a thermo-oxidative aging chamber. The aging temperature was 100℃ and the aging time was 72 hours. After the set aging time, the specimens were removed, and the tensile strength retention rate was measured. The results are shown in Table 2.

[0074] Table 2

[0075]

[0076] As can be seen from the percentage of extraction mass loss test results in Table 2, compared with Comparative Examples 1-4, the amount of migration and precipitation of 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 rate test results show that the rubber products prepared by the present invention have better anti-aging properties.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

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

Claims

1. A rubber processing aid composition, characterized in that, The product comprises the following raw materials in parts by weight: 100 parts rubber matrix, 20-30 parts ionic liquid grafted hyperbranched polyester, 6-7 parts multifunctional antioxidant, 2-4 parts polyethylene wax, and 6-7 parts microcrystalline wax; the multifunctional antioxidant is prepared by reacting selenocysteine ​​hydrochloride and allyl isothiocyanate. The ionic liquid-grafted hyperbranched polyester is a 1-carboxymethyl-3-vinylimidazolium chloride-grafted terminal hydroxyl hyperbranched polyester. Ionic liquid-grafted hyperbranched polyester is prepared via the following steps: Add the hydroxyl-terminated 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℃, and add dropwise a mixture of 1-carboxymethyl-3-vinylimidazolium chloride, hydroquinone and N,N-dimethylformamide under stirring. After the addition is complete, react under normal pressure for 4 hours and under reduced pressure for 2 hours. Finally, remove DMF by vacuum distillation.

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

3. The rubber processing aid composition according to claim 1, characterized in that, The hydroxyl-terminated hyperbranched polyester is an aliphatic hyperbranched polyester with a molecular weight of 500-1100 and 5-12 hydroxyl groups per mol.

4. The rubber processing aid composition according to claim 1, characterized in that, The multifunctional anti-aging agent is prepared through the following steps: At room temperature, selenocysteine ​​hydrochloride and anhydrous ethanol were added to a flask and stirred to dissolve. Then, dibutyltin dilaurate was added dropwise, followed by allyl isothiocyanate, which was added dropwise while stirring. The addition was completed within 30 minutes. The temperature was raised to 50°C and stirred for 4 hours. The temperature was then lowered to room temperature and the reaction was continued for 48 hours. Finally, the mixture was poured into cyclohexane and stirred to obtain a precipitate. The precipitate was filtered, washed with cyclohexane, and dried.

5. The rubber processing aid composition according to claim 4, characterized in that, The ratio of selenocysteine ​​hydrochloride, anhydrous ethanol, dibutyltin dilaurate, and allyl isothiocyanate is 60 mmol: 80-150 mL: 0.124 g: 125-130 mmol.

6. The rubber processing aid composition according to claim 4, characterized in that, The rubber matrix is ​​styrene-butadiene rubber and / or natural rubber.

7. A method for preparing a rubber processing aid composition according to any one of claims 1-6, characterized in that, Includes the following steps: Rubber matrix, ionic liquid grafted hyperbranched polyester, multifunctional antioxidant, polyethylene wax and microcrystalline wax are added to a mixer at an initial temperature of 100-120℃ and stirred for 0.5-1 hours to obtain a mixture. The mixture is then transferred to the feed trough of a granulator for extrusion at a die head nozzle pressure of 3-5 MPa and a temperature of 110-140℃. After extrusion and pelletizing, the mixture is cooled to obtain a rubber processing aid composition.

8. The method for preparing the rubber processing aid composition according to claim 7, characterized in that, During the pelleting process, the diameter is controlled at 6mm and the pellet length is 6-8mm.

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