A mixing method for improving the processability of high silica content filler rubber

Abstract

This invention relates to the field of rubber processing technology and discloses a mixing method for improving the processability of high-silica-content filled rubber. The method employs a segmented mixing technique, adding silica, silane coupling agent, and resin in stages for segmented reactions. In one stage of mixing, the silica content is 60-90% of the total silica content, the silane coupling agent content is 60-90% of the total silane coupling agent content, and the resin content is 65-90% of the total resin content. The mixing temperature and internal mixer filling rate are appropriately controlled, with the internal mixer filling rate at 60-70%. The mixing temperature is adjusted appropriately based on process requirements, physical property requirements, and seasonal changes. The beneficial effects of this invention are: by adding and reacting the silica and silane coupling agent, which participate in the silanization reaction, in stages, the degree of silanization reaction is improved; simultaneously, by adding resin in stages and controlling the mixing temperature and internal mixer filling rate, the sheet-forming properties and processing performance of the rubber compound are improved.

Description

Technical Field

[0001] This invention relates to the field of rubber processing technology, and more specifically, to a mixing method for improving the processability of high silica-content filled rubber. Background Technology

[0002] To improve the wet grip and rolling resistance of automobile tires, a large amount of silica is often added to the tire compound. Silica is a powder particle with abundant silanol groups on its surface. Due to the hydrogen bonding between hydroxyl groups in the compound, silica is prone to flocculation. The higher the silica content in the compound, the more severe the flocculation. Therefore, it is necessary to improve the compatibility and dispersibility between the compound and silica by adding silane coupling agents. At the same time, high silica-content filled rubber compounds have higher Mooney viscosity and poor processing performance due to the formation of internal filler networks. Ultra-high silica-content filled rubber compounds may experience problems such as zipper breakage and poor sheet formation during extrusion, causing difficulties for subsequent processing.

[0003] Chinese invention patent (publication number: CN104985710A, publication date: 2015.10.21) discloses a high-silica content tire tread compounding process that combines the characteristics of a one-step rubber mixing system. Through optimization of the internal mixing process (optimization of the order of chemical input, optimization of the "silanization reaction" conditions in the internal mixer), optimization of the open mill mixing process, and optimization of the high-silica-content filled tire tread formulation and the ratio of silane coupling agent to silica, the following technical effects are achieved: improved silica dispersibility, improved abrasion resistance, reduced rubber compound heat generation, and reduced rolling resistance; improved silanization reaction degree, optimized dynamic properties and processing safety of the rubber compound, through a combination of high-temperature silanization reaction in the internal mixer and low-temperature silanization reaction in the open mill; improved rubber compound flowability, improved processability in subsequent processes, and reduced processing energy consumption; reduced number of mixing stages, and improved production efficiency.

[0004] Chinese invention patent (publication number: CN105906878A, publication date: 2016.08.31) discloses a multi-stage mixing method for rubber with high silica content, relating to the field of rubber mixing, including the following steps: (1) First-stage masterbatch preparation steps: a. raw rubber plasticizing stage; b. rapid heating stage; c. slow heating stage I; d. slow heating stage II; e. constant temperature reaction stage; (2) Second-stage masterbatch preparation steps: step a; b. rapid heating stage; c. slow heating stage I; d. slow heating stage II; e. constant temperature reaction stage. This invention provides a multi-stage mixing method for rubber with high silica content, in which the rubber, silica, and silane coupling agent participating in the silanization reaction are fully reacted in the first-stage masterbatch, avoiding the influence of other excipients on the reaction between silica and coupling agent, thereby improving the degree of silanization reaction of silica. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a mixing method for improving the processability of high silica-content filler rubber. Through segmented mixing technology, combined with the segmented addition of silica, silane coupling agent and resin, and by controlling the mixing temperature and the filling amount of the internal mixer, a compound rubber with good processability, low Mooney viscosity and good sheeting properties is obtained.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A mixing method for improving the processability of high silica content filler rubber includes the following steps:

[0008] 1) One-stage mixing: Mixing is carried out using an internal mixer, with a filling rate of 60-70%;

[0009] a. Add the following to the host computer: rubber compound, anti-aging agent, protective wax, 65-90% of the total amount of resin, 60-90% of the total amount of silane coupling agent, and the first batch of silica. Mix at 45-55 rpm for 20-30 seconds. The first batch of silica is 70-90% of the amount of silica added in the first stage, and the amount of silica added in the first stage is 60-90% of the total amount of silica.

[0010] b. Add carbon black and the remaining first-stage silica, and mix at 35-50 rpm for 15-25 seconds.

[0011] c. Add rubber oil, mix at 35-45 rpm, heat the press to 130-180℃, and hold for 40-130 seconds.

[0012] d. The starting speed of the lower-level machine is ≥50rpm, the set temperature is 135-165℃, and the holding time is 60-150s;

[0013] 2) Two-stage mixing: Mixing is carried out using an internal mixer, with a filling rate of 60-70%;

[0014] a. Add the first-stage mixed rubber compound, the second-stage silica, 10-35% of the total resin, 10-40% of the total silane coupling agent, and activator to the host computer. The amount of the second-stage silica added is 10-35% of the total silica. Mix at 40-50 rpm for 15-25 seconds and then lift the pellet.

[0015] b. Continue mixing at a speed of 25-40 rpm, heat the pressing wheel to 135-180℃, and hold for 30-150 seconds.

[0016] c. The starting speed of the lower-level machine is ≥50rpm, the set temperature is 135-165℃, and the heat preservation time is 60-150s.

[0017] 3) Final refining stage: Mixing is carried out using an internal mixer;

[0018] a. Add the rubber compound, sulfur, and accelerator after the second stage of mixing, and mix at 25-35 rpm for 15 seconds to remove the lumps.

[0019] b. Mix at 25-35 rpm for 10-20 seconds, then remove from heat.

[0020] c. Mix at 20-30 rpm and 90-110℃ for 85-95 seconds;

[0021] d. Discharge glue at a speed of 30-40 rpm.

[0022] As a preferred embodiment, a mixing method for improving the processability of high silica content filler rubber includes the following steps:

[0023] 1) One-stage mixing: Mixing is carried out using an internal mixer, with a filling rate of 60-70%;

[0024] a. Add the following to the host computer: rubber compound, anti-aging agent, protective wax, 65-90% of the total amount of resin, 60-90% of the total amount of silane coupling agent, and the first batch of silica. Mix at 50 rpm for 25 seconds. The first batch of silica is 70-90% of the amount of silica added in the first stage, and the amount of silica added in the first stage is 60-90% of the total amount of silica.

[0025] b. Add carbon black and the remaining first-stage silica, and mix at 40 rpm for 20 seconds;

[0026] c. Add rubber oil, mix at 40 rpm, heat the press to 130-180℃, and hold for 40-130 seconds;

[0027] d. The starting speed of the lower-level machine is ≥50rpm, the set temperature is 135-165℃, and the holding time is 60-150s;

[0028] 2) Two-stage mixing: Mixing is carried out using an internal mixer, with a filling rate of 60-70%;

[0029] a. Add the first-stage mixed rubber compound, the second-stage silica, 10-35% of the total resin, 10-40% of the total silane coupling agent, and activator to the host computer. The amount of the second-stage silica added is 10-35% of the total silica. Mix at 45 rpm for 20 seconds and then remove the pellet.

[0030] b. Continue mixing at 30 rpm, heat the grinding wheel to 135-180℃, and hold for 30-150 seconds.

[0031] c. The starting speed of the lower-level machine is ≥50rpm, the set temperature is 135-165℃, and the heat preservation time is 60-150s.

[0032] 3) Final refining stage: Mixing is carried out using an internal mixer;

[0033] a. Add the rubber compound, sulfur, and accelerator after the second stage of mixing, mix at 30 rpm for 15 seconds, and then remove the lumps.

[0034] b. Mix at 30 rpm for 15 seconds, then remove from heat.

[0035] c. Mix at 25 rpm for 90 seconds at 90-110℃;

[0036] d. Discharge glue at 35 rpm.

[0037] As a preferred option, in step (1)b, when the ambient temperature is above 15°C, it is preferable to mix at a speed of 35-45 rpm; when the ambient temperature is below 15°C, it is preferable to mix at a speed of 45-50 rpm.

[0038] As a preferred option, in step (1)c, when the ambient temperature is higher than 15℃, the pressure weight is preferably heated to 130℃-165℃ and kept warm for 40-100s; when the ambient temperature is lower than 15℃, the pressure weight is preferably heated to 140℃-180℃ and kept warm for 50-130s.

[0039] As a preferred option, in step (2)b, when the ambient temperature is higher than 15℃, the preferred mixing speed is 25-35 rpm, the pressure roller is heated to 135-165℃, and the temperature is maintained for 30-120s; when the ambient temperature is lower than 15℃, the mixing speed is 35-40 rpm, the pressure roller is heated to 145-180℃, and the temperature is maintained for 50-150s.

[0040] Preferably, the nitrogen adsorption specific surface area (BET) of the silica is 140-230 m². 2 / g.

[0041] Preferably, the resin includes, but is not limited to, C5 petroleum resin, C5 / C9 copolymer petroleum resin, DCPD resin, DCPD / C9 petroleum resin, terpenoids, phenols, and aromatic hydrocarbons.

[0042] Preferably, the silane coupling agent is one or more of bis-(γ-triethoxysilylpropyl)tetrasulfide, bis-(γ-triethoxysilylpropyl)disulfide, and mercaptosilane.

[0043] Preferably, the activator is zinc oxide and / or stearic acid, the anti-aging agent is 6PPD, and the accelerator is one or more of accelerator CZ, accelerator TBzTD, and accelerator TPZ.

[0044] Furthermore, the present invention also discloses an improved high silica content filler composition, which is obtained by the mixing method described above and uses the raw materials described above;

[0045] This composition is prepared by mixing the following raw materials in parts by weight, based on 100 parts by weight of raw rubber: 80 parts by weight of solution-polymerized styrene-butadiene rubber, 20 parts by weight of natural rubber, 3-10 parts by weight of carbon black, 120-160 parts by weight of silica, 5-15 parts by weight of silane coupling agent, 20-80 parts by weight of total resin, 5-15 parts by weight of rubber oil, 0.8-2.0 parts by weight of sulfur, 1.0-3.0 parts by weight of zinc oxide, 1.0-3.0 parts by weight of stearic acid, 1.0-3.0 parts by weight of 6PPD, 1.5-3.0 parts by weight of accelerator CZ, 0.1-1.5 parts by weight of accelerator TBzTD, 0.1-1.5 parts by weight of accelerator TPZ, and 1.0-3.0 parts by weight of protective wax.

[0046] The beneficial effects of the present invention are as follows: The present invention provides a mixing method for improving the processing performance of high silica-filled rubber, wherein silica and silane coupling agent participating in the silanization reaction are added and reacted in stages, thereby improving the degree of silanization reaction; at the same time, resin is added in stages, and by controlling the mixing temperature and the filling amount of the mixing mill, the sheeting performance and processing performance of the rubber compound are improved. Detailed Implementation

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0048] The following are the compounding formulations for the examples and comparative examples:

[0049] Solution-polymerized styrene-butadiene rubber HPR840: 80 parts by weight

[0050] Natural rubber: 20 parts by weight

[0051] Carbon black N330: 5 parts by weight

[0052] Silica 2115MP: 140 parts by weight

[0053] Silane coupling agent 69:11 parts by weight,

[0054] C9 / DCPD resin: 50 parts by weight

[0055] Rubber oil V700: 10 parts by weight

[0056] Sulfur: 2.0 parts by weight

[0057] Zinc oxide: 2.5 parts by weight

[0058] Stearic acid: 1.0 part by weight

[0059] Anti-aging agent 6PPD: 1.0 part by weight

[0060] Accelerator CZ: 1.5 parts by weight

[0061] Accelerator TBzTD: 0.5 parts by weight

[0062] Accelerator TPZ: 0.5 parts by weight

[0063] Protective wax: 1.0 part by weight.

[0064] The mixing method for this example is as follows:

[0065] 1) One-stage mixing: Mixing is carried out using an internal mixer, with a filling rate of 60-70%;

[0066] a. Add the following to the host computer: rubber compound, silane coupling agent, carbon black, anti-aging agent, protective wax, 65-90% of the total resin, 60-90% of the total silane coupling agent, and the first batch of silica. Mix at 50 rpm for 25 seconds. The first batch of silica is 70-90% of the total amount of silica added in the first stage, which is 60-90% of the total amount of silica.

[0067] b. Add carbon black and the remaining first-stage silica, and mix at 40 rpm for 20 seconds;

[0068] c. Add rubber oil, mix at 40 rpm, heat the press to 130-180℃, and hold for 40-130 seconds;

[0069] d. The starting speed of the lower-level machine is ≥50rpm, the set temperature is 135-165℃, and the holding time is 60-150s;

[0070] 2) Two-stage mixing: Mixing is carried out using an internal mixer, with a filling rate of 60-70%;

[0071] a. Add the first-stage mixed rubber compound, the second-stage silica, 10-35% of the total resin, 10-40% of the total silane coupling agent, and activator to the host computer. The amount of the second-stage silica added is 10-35% of the total silica. Mix at 45 rpm for 20 seconds and then remove the pellet.

[0072] b. Continue mixing at 30 rpm, heat the grinding wheel to 135-180℃, and hold for 30-150 seconds.

[0073] c. The starting speed of the lower-level machine is ≥50rpm, the set temperature is 135-165℃, and the heat preservation time is 60-150s.

[0074] 3) Final refining stage: Mixing is carried out using an internal mixer;

[0075] a. Add the rubber compound, sulfur, and accelerator after the second stage of mixing, mix at 30 rpm for 15 seconds, and then remove the lumps.

[0076] b. Mix at 30 rpm for 15 seconds, then remove from heat.

[0077] c. Mix at 25 rpm for 90 seconds at 90-110℃;

[0078] d. Discharge glue at 35 rpm.

[0079] The comparative mixing method is the same as in the example, with appropriate adjustments to the stage input amounts of silica, silane coupling agent and resin, as well as the mixing temperature and time, as shown in Table 1.

[0080] Table 1

[0081] Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 Parts of silica / Phr 140 140 140 140 140 140 Partial internal mixer filling rate / % 64% 68% 68% 65% 68% 68% First stage silica input rate / % 100 100 80 70 80 80 Silane coupling agent dosage (%) 100 100 80 70 80 80 Resin input rate (%) 100 80 100 70 80 80 Temperature and time in stage c 140℃*80s 145℃*80s 145℃*80s 140℃*60s 140℃*80s 145℃*80s Temperature and time in a d-stage 140℃*80s 140℃*120s 140℃*120s 140℃*80s 140℃*100s 140℃*120s Temperature and time in stage b of phase two 145℃*60s 145℃*60s 145℃*60s 145℃*60s 145℃*60s 145℃*60s Temperature and time in stage c of phase two 140℃*80s 140℃*120s 140℃*120s 140℃*100s 140℃*100s 140℃*120s Δ' 100 102 103 105 108 110 Mooney viscosity ML1+4 at 100℃ 70 71 69 69 65 60 large-scale The final rubber compound sticks to the rollers severely. The final rubber compound sticks to the rollers quite badly. The final rubber compound sticks to the rollers quite badly. A section of the sheet showed slight edge breakage, but the adhesion to the rollers was significantly improved after final mixing. No edge breakage, and the final compound slightly sticks to the rollers. There was no edge breakage, and the final compounded rubber was basically non-sticky to the rollers.

[0082] Physical properties:

[0083] Payne effect (ΔG'): Characterized by RPA, the Payne effect is characterized by the difference in G' (ΔG') between strain-scanning RPA at 0.28% and 40% strain. The larger the ΔG', the more pronounced the Payne effect and the worse the dispersibility of silica. The Payne effect ΔG' is compared with Comparative Example 1 (100) as a control.

[0084] Mooney viscosity: The Mooney viscosity of a compound is characterized by its processability. Within a certain range, the lower the Mooney viscosity, the better the processability of the compound.

[0085] Analysis of Table 1 shows that Example 3 is the optimal embodiment. Comparing Example 3 and Comparative Example 2, it can be seen that the simultaneous, staged addition of silica and silane coupling agent can effectively improve the degree of silanization reaction, thereby improving the sheet-forming properties of the rubber compound. Comparing Example 3 and Comparative Example 3, it can be seen that the staged addition of resin can effectively improve the sheet-forming and processing properties of the rubber compound. Comparing Example 3 and Example 2, it can be seen that appropriate mixing temperature and time can further enhance and improve the sheet-forming and processing properties of the rubber compound.

[0086] The foregoing description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A mixing method for improving the processability of high silica content filler rubber, characterized in that, Includes the following steps: 1) One-stage mixing: Mixing is carried out using an internal mixer, with a filling rate of 60-70%; a. Add the following to the host computer: rubber compound, anti-aging agent, protective wax, 65-90% of the total amount of resin, 60-90% of the total amount of silane coupling agent, and the first batch of silica. Mix at 45-55 rpm for 20-30 seconds. The first batch of silica is 70-90% of the amount of silica added in the first stage, and the amount of silica added in the first stage is 60-90% of the total amount of silica. b. Add carbon black and the remaining first-stage silica, and mix at 35-50 rpm for 15-25 seconds. c. Add rubber oil, mix at 35-45 rpm, heat the press to 130-180℃, and hold for 40-130 seconds. d. The starting speed of the lower-level machine is ≥50rpm, the set temperature is 135-165℃, and the holding time is 60-150s; 2) Two-stage mixing: Mixing is carried out using an internal mixer, with a filling rate of 60-70%; a. Add the first-stage mixed rubber compound, the second-stage silica, 10-35% of the total resin, 10-40% of the total silane coupling agent, and activator to the host computer. The amount of the second-stage silica added is 10-35% of the total silica. Mix at 40-50 rpm for 15-25 seconds and then lift the pellet. b. Continue mixing at a speed of 25-40 rpm, heat the pressing wheel to 135-180℃, and hold for 30-150 seconds. c. The starting speed of the lower-level machine is ≥50rpm, the set temperature is 135-165℃, and the heat preservation time is 60-150s. 3) Final refining stage: Mixing is carried out using an internal mixer; a. Add the rubber compound, sulfur, and accelerator after the second stage of mixing, and mix at 25-35 rpm for 15 seconds to remove the lumps. b. Mix at 25-35 rpm for 10-20 seconds, then remove from heat. c. Mix at 20-30 rpm and 90-110℃ for 85-95 seconds; d. Discharge glue at a speed of 30-40 rpm.

2. The mixing method for improving the processability of high silica content filler rubber according to claim 1, characterized in that, Includes the following steps: 1) One-stage mixing: Mixing is carried out using an internal mixer, with a filling rate of 60-70%; a. Add the following to the host computer: rubber compound, anti-aging agent, protective wax, 65-90% of the total amount of resin, 60-90% of the total amount of silane coupling agent, and the first batch of silica. Mix at 50 rpm for 25 seconds. The first batch of silica is 70-90% of the amount of silica added in the first stage, and the amount of silica added in the first stage is 60-90% of the total amount of silica. b. Add carbon black and the remaining first-stage silica, and mix at 40 rpm for 20 seconds; c. Add rubber oil, mix at 40 rpm, heat the press to 130-180℃, and hold for 40-130 seconds; d. The starting speed of the lower-level machine is ≥50rpm, the set temperature is 135-165℃, and the holding time is 60-150s; 2) Two-stage mixing: Mixing is carried out using an internal mixer, with a filling rate of 60-70%; a. Add the first-stage mixed rubber compound, the second-stage silica, 10-35% of the total resin, 10-40% of the total silane coupling agent, and activator to the host computer. The amount of the second-stage silica added is 10-35% of the total silica. Mix at 45 rpm for 20 seconds and then remove the pellet. b. Continue mixing at 30 rpm, heat the grinding wheel to 135-180℃, and hold for 30-150 seconds. c. The starting speed of the lower-level machine is ≥50rpm, the set temperature is 135-165℃, and the heat preservation time is 60-150s. 3) Final refining stage: Mixing is carried out using an internal mixer; a. Add the rubber compound, sulfur, and accelerator after the second stage of mixing, mix at 30 rpm for 15 seconds, and then remove the lumps. b. Mix at 30 rpm for 15 seconds, then remove from heat. c. Mix at 25 rpm for 90 seconds at 90-110℃; d. Discharge glue at 35 rpm.

3. The mixing method for improving the processability of high silica content filler rubber according to claim 1, characterized in that, In step 1)b, when the ambient temperature is above 15℃, it is preferred to mix at a speed of 35-45 rpm; when the ambient temperature is below 15℃, it is preferred to mix at a speed of 45-50 rpm.

4. A mixing method for improving the processability of high silica content filler rubber according to claim 1 or 2, characterized in that, In step 1)c, when the ambient temperature is above 15℃, it is preferable to heat the pressing stone to 130℃-165℃ and hold it for 40-100s; when the ambient temperature is below 15℃, it is preferable to heat the pressing stone to 140℃-180℃ and hold it for 50-130s.

5. A mixing method for improving the processability of high silica content filler rubber according to claim 1 or 2, characterized in that, In step 2)b, when the ambient temperature is above 15℃, the preferred mixing speed is 25-35 rpm, the pressure roller is heated to 135-165℃, and held for 30-120s; when the ambient temperature is below 15℃, the mixing speed is 35-40 rpm, the pressure roller is heated to 145-180℃, and held for 50-150s.

6. A mixing method for improving the processability of high silica content filler rubber according to any one of claims 1-3, characterized in that, The nitrogen adsorption specific surface area (BET) of the precipitated silica is 140-230 m². 2 / g.

7. The mixing method for improving the processability of high silica content filler rubber according to claim 4, characterized in that, The nitrogen adsorption specific surface area (BET) of the precipitated silica is 140-230 m². 2 / g.

8. The mixing method for improving the processability of high silica content filler rubber according to claim 5, characterized in that, The nitrogen adsorption specific surface area (BET) of the precipitated silica is 140-230 m². 2 / g.

9. A mixing method for improving the processability of high silica content filler rubber according to any one of claims 1-3, characterized in that, The resins include, but are not limited to, C5 petroleum resin, C5 / C9 copolymer petroleum resin, DCPD resin, DCPD / C9 petroleum resin, terpenoids, phenols, and aromatic hydrocarbons.

10. A mixing method for improving the processability of high silica content filler rubber according to claim 4, characterized in that, The resins include, but are not limited to, C5 petroleum resin, C5 / C9 copolymer petroleum resin, DCPD resin, DCPD / C9 petroleum resin, terpenoids, phenols, and aromatic hydrocarbons.

11. A mixing method for improving the processability of high silica content filler rubber according to claim 5, characterized in that, The resins include, but are not limited to, C5 petroleum resin, C5 / C9 copolymer petroleum resin, DCPD resin, DCPD / C9 petroleum resin, terpenoids, phenols, and aromatic hydrocarbons.

12. A mixing method for improving the processability of high silica content filler rubber according to any one of claims 1-3, characterized in that, The silane coupling agent is one or more of bis-(γ-triethoxysilylpropyl)tetrasulfide, bis-(γ-triethoxysilylpropyl)disulfide, and mercaptosilane.

13. The mixing method for improving the processability of high silica content filler rubber according to claim 4, characterized in that, The silane coupling agent is one or more of bis-(γ-triethoxysilylpropyl)tetrasulfide, bis-(γ-triethoxysilylpropyl)disulfide, and mercaptosilane.

14. The mixing method for improving the processability of high silica content filler rubber according to claim 5, characterized in that, The silane coupling agent is one or more of bis-(γ-triethoxysilylpropyl)tetrasulfide, bis-(γ-triethoxysilylpropyl)disulfide, and mercaptosilane.

15. A mixing method for improving the processability of high silica content filler rubber according to any one of claims 1-3, characterized in that, The activator is zinc oxide and / or stearic acid, the anti-aging agent is 6PPD, and the accelerator is one or more of accelerator CZ, accelerator TBzTD, and accelerator TPZ.

16. The mixing method for improving the processability of high silica content filler rubber according to claim 4, characterized in that, The activator is zinc oxide and / or stearic acid, the anti-aging agent is 6PPD, and the accelerator is one or more of accelerator CZ, accelerator TBzTD, and accelerator TPZ.

17. A mixing method for improving the processability of high silica content filler rubber according to claim 5, characterized in that, The activator is zinc oxide and / or stearic acid, the anti-aging agent is 6PPD, and the accelerator is one or more of accelerator CZ, accelerator TBzTD, and accelerator TPZ.

18. A composition for improving high silica content filler, characterized in that, The composition was obtained by mixing using the mixing method described in any one of claims 6-17; This composition is prepared by mixing the following raw materials in parts by weight, based on 100 parts by weight of raw rubber: 80 parts by weight of solution-polymerized styrene-butadiene rubber, 20 parts by weight of natural rubber, 3-10 parts by weight of carbon black, 120-160 parts by weight of silica, 5-15 parts by weight of silane coupling agent, 20-80 parts by weight of total resin, 5-15 parts by weight of rubber oil, 0.8-2.0 parts by weight of sulfur, 1.0-3.0 parts by weight of zinc oxide, 1.0-3.0 parts by weight of stearic acid, 1.0-3.0 parts by weight of 6PPD, 1.5-3.0 parts by weight of accelerator CZ, 0.1-1.5 parts by weight of accelerator TBzTD, 0.1-1.5 parts by weight of accelerator TPZ, and 1.0-3.0 parts by weight of protective wax.