CN103449458A - Preparation method of high-dispersivity white carbon black - Google Patents

Abstract

The invention relates to a preparation method of high-dispersivity white carbon black, which comprises the following steps: a. taking 1000 parts by weight of 12-15% sodium silicate solution, adding 100-120 parts by weight of sodium sulfate into the sodium silicate solution, and sufficiently stirring uniformly to obtain a mixed solution; and b. adding a 10-15% sulfuric acid solution into the mixed solution, reacting until the sodium silicate is completely reacted, continuing stirring while dropwisely adding 0.1-0.2 part by weight of sodium dodecyl benzene sulfonate to precipitate in the reaction system, and adding sodium hydroxide to regulate the pH value of the system to a neutral state. The addition of the sodium dodecyl benzene sulfonate enhances the dispersivity of the silicon dioxide, slows the polymerization of the silicon dioxide particles, reduces the particle size of the white carbon black product, and increases the specific area.

Description

A kind of preparation method of polymolecularity white carbon black

Technical field:

The present invention relates to technical field prepared by the chemical field white carbon black, be specifically related to a kind of preparation method of polymolecularity white carbon black.

Background technology:

White carbon black is lightweight hydrated SiO 2 material, with the micropore powder form of amorphous state, exists, and be a kind of purposes important Chemicals very widely.The white carbon black specific surface area is larger, usually be greater than 130m2/g, powder particle has a large amount of microvoid structures, the rich surface hydroxyl, the characteristics such as good absorption, fire-retardant, insulation, suspension, thixotropy, thixotroping, scattering of light, surface graft modification are arranged, and its remarkable strengthening action obtains important application at the rubber item manufacture field.

The precipitator method are divided into sulfuric acid process and salt acid system usually according to adopted sour kind difference, and wherein sulfuric acid process is the major way of production common white carbon black.

Water glass at first under hydrochloric acid or effect of sulfuric acid silicate ion wherein hydrolysis occurs obtains the silicic acid molecule, the silicic acid molecule continues dehydration again and obtains silicon dioxide molecules, silicon dioxide molecules and then rapidly polymerization obtain the silicon dioxide granule of polymeric form.In the preparation process of white carbon black, the size from collecting process and the polymerization degree of silicic acid molecule has determined the size of particles of white carbon black product, and more little more being easy to of product cut size disperseed.

Summary of the invention:

There are the problems such as the polymerization degree is too high, particle diameter large, specific surface is less, bad dispersibility in the present invention for the white carbon black that solves existing common precipitator method explained hereafter, avoid the sodium sulfate wastewater produced in the Production By Sulfuric Acid Process process to discharge the problem of environmental pollution caused simultaneously, the preparation method of polymolecularity white carbon black is provided.

Technical solution of the present invention is as follows:

A kind of preparation method of polymolecularity white carbon black, is characterized in that, comprises the following steps:

A, get sodium silicate solution 1000 weight parts that concentration is 12-15%, add in sodium silicate solution: the sodium sulfate of 100-120 weight part, stir and obtain mixed solution;

B, in the mixed solution obtained, add the 10-15% sulphuric acid soln to react to water glass to have reacted, continued to stir, dripped the Sodium dodecylbenzene sulfonate of 0.1-0.2 weight part simultaneously, throw out appears in reaction system, and to add sodium hydroxide regulation system pH be neutrality;

C, by the still aging 4-5h of the throw out obtained, then carry out press filtration, obtain filter cake;

D, the filter cake obtained is carried out to repetitive scrubbing, drying, then through grinding the white carbon black of the loose property that secures satisfactory grades.

The invention has the beneficial effects as follows: the present invention, by adding Sodium dodecylbenzene sulfonate, has increased the dispersiveness of silicon-dioxide, and the polymerization of the silicon dioxide granule that slowed down has reduced the particle diameter of white carbon black product, has increased specific surface area.

Embodiment

A kind of preparation method of polymolecularity white carbon black comprises the following steps:

A, get sodium silicate solution 1000 weight parts that concentration is 15%, add in sodium silicate solution: the sodium sulfate of 100 weight parts, stir and obtain mixed solution;

B, in the mixed solution obtained, add 15% sulphuric acid soln to react to water glass to have reacted, continued to stir, dripped the Sodium dodecylbenzene sulfonate of 0.1 weight part simultaneously, throw out appears in reaction system, and to add sodium hydroxide regulation system pH be neutrality;

C, by the still aging 4-5h of the throw out obtained, then carry out press filtration, obtain filter cake;

D, the filter cake obtained is carried out to repetitive scrubbing, drying, then through grinding the white carbon black of the loose property that secures satisfactory grades.

The BET specific surface area 306m of the white carbon black that after testing, prepared by the present invention ²/ g, the DPB absorption value reaches 3.1cm ³/ g.

Claims (1)

1. the preparation method of a polymolecularity white carbon black, is characterized in that, comprises the following steps:

A, get sodium silicate solution 1000 weight parts that concentration is 12-15%, add in sodium silicate solution: the sodium sulfate of 100-120 weight part, stir and obtain mixed solution;

B, in the mixed solution obtained, add the 10-15% sulphuric acid soln to react to water glass to have reacted, continued to stir, dripped the Sodium dodecylbenzene sulfonate of 0.1-0.2 weight part simultaneously, throw out appears in reaction system, and to add sodium hydroxide regulation system pH be neutrality;

C, by the still aging 4-5h of the throw out obtained, then carry out press filtration, obtain filter cake;

D, the filter cake obtained is carried out to repetitive scrubbing, drying, then through grinding the white carbon black of the loose property that secures satisfactory grades.