1. A preparation method of special high-dispersion white carbon black for a high-fatigue-resistance tire comprises the following steps:

(1) adding a certain amount of electrolyte solution and stearic acid ethanolamine into a reaction kettle, and heating to 60-65 ℃;

(2) then adding a sodium silicate solution into the reaction kettle until the pH value is 9-10, and heating to 70-75 ℃;

(3) continuously adding a sodium silicate solution into the reaction kettle, and adding an acidifying agent to keep the pH value at 10-11;

(4) and after the sodium silicate solution is added, continuously adding an acidifying agent until the pH value is 5-6, and reacting to obtain the white carbon black.

2. The method of claim 1, wherein: the electrolyte solution is a sodium sulfate solution.

3. The method of claim 2, wherein: the concentration of the sodium sulfate solution is 8 wt%, and the addition amount of the sodium sulfate solution is 1/6-1/7 of the volume of the reaction kettle.

4. The method of claim 1, wherein: the addition amount of the stearic acid ethanolamine is SiO₂0.5-5 per mill of the weight of the sodium silicate.

5. The method of claim 1, wherein: the sodium silicate solution is 20 wt% sodium silicate solution.

6. The method of claim 5, wherein: in the step (3), after the volume of the reaction liquid reaches 2/3-3/4 of the volume of the reaction kettle, the addition of the sodium silicate solution is stopped.

7. The method of claim 1, wherein: the acidifying agent is a sulfuric acid solution.

8. The method of claim 7, wherein: the concentration of the sulfuric acid solution was 10 wt%.

9. The method of claim 1, wherein: in the step (4), after the pH value reaches 5-6, the reaction is carried out for 0.1-1 hour.

10. The method of claim 9, wherein: and after the reaction is finished, filtering, washing, pulping and drying to obtain the white carbon black.

Background

Due to the fact that road conditions are complex, the flexibility of an automobile in the driving process, particularly in the load driving process, is large, the hysteresis loss of a tire side rubber material caused by the bending deformation is large, the internal temperature of the tire is continuously increased in the long-time driving process, and cracks formed by thermal oxidation aging and fatigue caused by high temperature can directly cause tire damage. Therefore, the fatigue resistance of the tire is improved, and the running safety and the durability of the tire can be effectively improved.

Disclosure of Invention

The invention aims to provide a preparation method of special high-dispersion white carbon black for a high-fatigue-resistance tire.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation method of special high-dispersion white carbon black for a high-fatigue-resistance tire comprises the following steps:

(1) adding a certain amount of electrolyte solution and stearic acid ethanolamine into a reaction kettle, and heating to 60-65 ℃;

(2) then adding a sodium silicate solution into the reaction kettle until the pH value is 9-10, and heating to 70-75 ℃;

(3) continuously adding a sodium silicate solution into the reaction kettle, and adding an acidifying agent to keep the pH value at 10-11;

(4) and after the sodium silicate solution is added, continuously adding an acidifying agent until the pH value is 5-6, and reacting to obtain the white carbon black.

Preferably, the electrolyte solution is a sodium sulfate solution.

Preferably, the concentration of the sodium sulfate solution is 8 wt%, and the addition amount is 1/6-1/7 of the volume of the reaction kettle.

Preferably, the addition amount of the stearic acid ethanolamine is SiO₂0.5-5 per mill of the weight of the sodium silicate.

Preferably, the sodium silicate solution is a sodium silicate solution having a concentration of 20 wt%.

Preferably, in the step (3), the sodium silicate solution is stopped adding after the volume of the reaction solution reaches 2/3-3/4 of the volume of the reaction kettle.

Preferably, the acidifying agent is a sulfuric acid solution.

More preferably, the concentration of the sulfuric acid solution is 10 wt%.

Preferably, in the step (4), the reaction is carried out for 0.1 to 1 hour after the pH value reaches 5 to 6.

Preferably, after the reaction is finished, the white carbon black is obtained by filtering, washing, pulping and drying.

Detailed Description

The present invention will be described in further detail with reference to examples.

The preparation method of the special high-dispersion white carbon black for the high-fatigue-resistance tire comprises the following steps:

(1) adding a certain amount of electrolyte solution and stearic acid ethanolamine into a reaction kettle, and heating to 60-65 ℃;

(2) then adding a sodium silicate solution into the reaction kettle until the pH value is 9-10, and heating to 70-75 ℃;

(3) continuously adding a sodium silicate solution into the reaction kettle, and adding an acidifying agent to keep the pH value at 10-11;

(4) and after the sodium silicate solution is added, continuously adding an acidifying agent until the pH value is 5-6, and reacting to obtain the white carbon black.

In the invention, the electrolyte solution can be selected from a sodium sulfate solution, the concentration of the sodium sulfate solution can be controlled to be 8 wt%, and the addition amount of the sodium sulfate solution is 1/6-1/7 of the volume of the reaction kettle. The purpose of adding the electrolyte is to regulate and control the Zeta potential on the surface of the primary particles of the white carbon black and control the aggregation state of the primary particles.

In the invention, the adding amount of the stearic acid ethanolamine is SiO₂0.5-5 per mill of the weight of the sodium silicate, and the added ethanolamine stearate plays a role of a reaction regulator.

In the present invention, the sodium silicate solution is a sodium silicate solution having a concentration of 20 wt%. The concentration of the sodium silicate solution is too high, which easily causes the generation and aggregation of a large amount of instantaneous local silicon dioxide, and the concentration of the sodium silicate solution is too low, which causes the concentration of the silicon dioxide slurry to be too thin, and the energy consumption of the post-treatment is higher.

In the present invention, the acidifying agent can be selected from a solution of sulfuric acid having a concentration of 10% by weight. The ionic effect of the electrolyte sodium sulfate is enhanced by using sulfuric acid and sodium ions and sulfate ions generated after the sulfuric acid reacts with the sodium silicate.

After the reaction is complete, the slurry is subjected to appropriate post-treatment: filtering, washing, pulping and drying to obtain the white carbon black.

Example 1

A preparation method of special high-dispersion white carbon black for a high-fatigue-resistance tire comprises the following steps:

(1) adding a sodium sulfate solution with the concentration of 8 wt% into the reaction kettle to 1/6 of the volume of the reaction kettle, and then heating to 60-65 ℃.

(2) Adding stearic acid ethanolamine (CAS: 111-57-9) into a reaction kettle under stirring (60 revolutions per minute), wherein the addition amount of the stearic acid ethanolamine is sodium silicate (SiO₂Based) one thousandth of the total weight.

(3) Then adding a sodium silicate solution with the concentration of 20 wt% into the reaction kettle until the pH value of the system is 9-10, and then heating to 70-75 ℃.

(4) And continuously adding the sodium silicate solution into the reaction kettle, simultaneously adding a sulfuric acid solution with the concentration of 10 wt% to keep the pH value of the system at 10-11, and stopping adding the sodium silicate when the volume of the reaction liquid reaches 2/3 of the volume of the reaction kettle.

(5) After the sodium silicate solution is added, continuously adding a sulfuric acid solution with the concentration of 10 wt% until the pH value of the system is 5-6, and carrying out heat preservation reaction for 15 minutes.

(6) And carrying out filter pressing, washing, pulping and spray drying treatment on the reaction slurry to obtain the white carbon black.

The specific surface area of the white carbon black is 180-210 m²(g), the dispersion grade is more than or equal to 9.5.

Compared with the existing commercial precipitation-process white carbon black, the fatigue life of the tire, which is tested by the crack propagation method, can be prolonged by more than 10 percent by adopting the white carbon black prepared by the method.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.