CN109795045B

CN109795045B - Tread rubber inverse mixing process of all-white carbon black

Info

Publication number: CN109795045B
Application number: CN201910138687.8A
Authority: CN
Inventors: 张文广; 朱宇石; 刘志国; 高颖; 程谟伟
Original assignee: Chaoyang Long March Tire Co ltd
Current assignee: Chaoyang Long March Tire Co ltd
Priority date: 2019-02-25
Filing date: 2019-02-25
Publication date: 2021-06-04
Anticipated expiration: 2039-02-25
Also published as: CN109795045A

Abstract

The invention discloses a reverse mixing process of tread rubber of all-white carbon black, which relates to the technical field of tire manufacturing, in particular to a reverse mixing process of tread rubber of all-white carbon black, a) firstly adding plasticated rubber into a first section of master batch, simultaneously adding all the white carbon black, raising the mixing temperature to 135 ℃, adding a silane coupling agent, mixing for a period of time, then carrying out lump extraction twice, ensuring that the mixing time of raising the temperature to 150 ℃ at 140 ℃ is not less than 60 seconds, and finally discharging rubber to an open mill when the mixing temperature is 150 ℃; the lower auxiliary machine is three open mills connected in series, and the mixing time of each open mill is 180S. The tread rubber reverse mixing process of the full white carbon black improves the dispersibility of the white carbon black, improves the wear resistance, reduces the heat generation of rubber materials, reduces the rolling resistance and improves the anti-skid performance and the safety performance; by means of the combination of sufficient silanization reaction of an internal mixer and silanization reaction of a low-temperature section of an open mill, the silanization reaction degree is improved, the flowability of rubber materials is improved, the processability of the post-process is improved, and the number of mixing sections is reduced.

Description

Tread rubber inverse mixing process of all-white carbon black

Technical Field

The invention relates to the technical field of tire manufacturing industry, in particular to a reverse mixing process of tread rubber of all-white carbon black.

Background

The proper amount of white carbon black is added into tread rubber, which can obviously reduce the heat generation of rubber material, reduce the rolling resistance and improve the anti-skid performance and the safety performance, the white carbon black has higher surface polarity and lower rubber polarity, white carbon black particles are easy to gather in a rubber matrix and difficult to disperse in rubber in the mixing process, the energy consumption is large in the mixing process, compared with the carbon black, the white carbon black does not cause better performance of the rubber material, silane added as a chemical compounding agent is used as a coupling agent between the white carbon black and a polymer, the silane reacts with the white carbon black during the mixing process and generates an active reaction point which can be bonded with the polymer in the vulcanizing process later, and the banbury mixer is used as a chemical reactor for accurately controlling the temperature of the rubber material due to the chemical reaction in the mixing process, so as to solve the problem of difficult dispersion of the white carbon black and accelerate the popularization and application of the white, the performance of the tire is improved, the energy is saved, the research and the exploration are carried out from the aspects of raw materials, mixing technology, mixing equipment and the like, and certain effect is achieved.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a tread rubber reverse mixing process of all-white carbon black, and solves the problems in the background art.

In order to achieve the purpose, the invention is realized by the following technical scheme: a tread rubber reverse mixing process of full white carbon black,

a) firstly adding plasticated rubber into the first-stage master batch, simultaneously adding all white carbon black, raising the mixing temperature to 135 ℃, adding a silane coupling agent, mixing for a period of time, then extracting for two times, ensuring that the mixing time of raising the temperature to 150 ℃ at 140 ℃ is not less than 60 seconds, and finally mixing to 150 ℃ to discharge rubber to an open mill; the lower auxiliary machine is three open mills connected in series, and the mixing time of each open mill is 180S;

b) adding the first-stage masterbatch and zinc oxide and other powder materials into the second-stage masterbatch, extracting lump once at 130 ℃, and discharging the masterbatch to an open mill at 150 ℃;

c) adding two-stage masterbatch and final rubber powder into final rubber, extracting lumps twice in the middle, and discharging rubber to an open mill at 110 ℃; the dispersion degree of the white carbon black in the final rubber compound can finally reach more than grade 9.

Optionally, the filler and the coupling agent in step a are added before other compounding agents, and the coupling agent must be added after the filler is added and the mixing temperature is raised to the temperature required for the reaction of the filler and the coupling agent.

Optionally, the zinc oxide and other compounding agents of the step a are added in two stages.

Optionally, the mixing and rubber discharging temperature in the steps a to c is 150 ℃.

The invention provides a tread rubber inverse mixing process of all-white carbon black, which has the following beneficial effects:

the invention adopts the reverse mixing process of tread rubber of full white carbon black and combines the characteristics of a ZZ2 rotor internal mixer rubber mixing system, and achieves the following technical effects by optimizing the internal mixing process, optimizing the drug input sequence, optimizing the conditions of the internal mixer 'silanization reaction', optimizing the mixing process of an open mixer and the like, combining the aspects of high-content white carbon black filled tread formula, optimizing the matching proportion of a super silane coupling agent and the white carbon black and the like: the dispersibility of the white carbon black is improved, the wear resistance is improved, the heat generation of the rubber material is reduced, the rolling resistance is reduced, and the anti-skid property and the safety performance are improved.

Drawings

FIG. 1 is a graph showing strain versus elastic modulus;

FIG. 2 is a schematic diagram showing the relationship between the Mooney viscosity at 100 ℃ and the binder removal temperature.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention provides a technical scheme that: a tread rubber reverse mixing process of full white carbon black,

a) firstly adding plasticated rubber into the first-stage master batch, simultaneously adding all white carbon black, raising the mixing temperature to 135 ℃, adding a silane coupling agent, mixing for a period of time, then extracting for two times, ensuring that the mixing time of raising the temperature to 150 ℃ at 140 ℃ is not less than 60 seconds, and finally mixing to 150 ℃ to discharge rubber to an open mill; the lower auxiliary machine is three open mills connected in series, and the mixing time of each open mill is 180S; the filler and the coupling agent in the step a are added before other accessory ingredients, in addition, the coupling agent must be added after the filler is added and the mixing temperature is raised to the temperature required by the reaction of the filler and the coupling agent, and the zinc oxide and the other accessory ingredients in the step a are added in two stages;

c) adding two-stage masterbatch and final rubber powder into final rubber, extracting lumps twice in the middle, and discharging rubber to an open mill at 110 ℃; the dispersion degree of the white carbon black in the final rubber compound can finally reach more than 9 grades, and the mixing and rubber discharge temperature in the steps a to c is 150 ℃.

EXAMPLE 1

As shown in fig. 1: for the evaluation of the characteristics and dynamic mechanical rheological properties of the chemical reaction by the American AlphaRPA2000 rubber processing Analyzer: the lower the value of the shear modulus at low strain, the more complete the silanization process.

As shown in fig. 2: the viscosity drop tends to be stable when the rubber discharge temperature reaches 145 ℃, but the viscosity gradually increases when the rubber discharge temperature is higher than 150 ℃, and the increase of the Mooney viscosity in the later period indicates that the early silane/rubber reaction is caused by overhigh mixing temperature.

In summary, the reverse mixing process of the all-silica white tread rubber is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the scope of the present invention, and equivalent substitutions or changes according to the technical scheme and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. The reverse mixing process of tread rubber of all white carbon black is characterized by comprising the following steps of:

a) firstly adding plasticated rubber into the first-stage master batch, simultaneously adding all white carbon black, raising the mixing temperature to 135 ℃, adding a silane coupling agent, mixing for a period of time, then extracting for two times, ensuring that the mixing time of raising the temperature to 150 ℃ at 140 ℃ is not less than 60 seconds, and finally mixing to 150 ℃ to discharge rubber to an open mill; the lower auxiliary machine is three open mills connected in series, each mixing time is 180S, the filler and the coupling agent are added before other ingredients, in addition, the coupling agent is added after the filler is added and when the mixing temperature is raised to the temperature required by the reaction of the filler and the coupling agent, and the mixing and rubber discharging temperature is 150 ℃;

b) adding the first-stage masterbatch and zinc oxide and other powder materials into the second-stage masterbatch, carrying out lump extraction once at 130 ℃, discharging the rubber to an open mill at 150 ℃, and mixing and discharging the rubber at 150 ℃;

c) adding two-stage masterbatch and final rubber powder into final rubber, extracting lumps twice in the middle, and discharging rubber to an open mill at 110 ℃; the dispersion degree of the white carbon black in the final rubber compound can reach more than 9 grades, zinc oxide and other compounding agents are added, and the mixing and rubber discharging temperature is 150 ℃.