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Process for producing rubber-wet masterbatch, rubber composition, and tire

A manufacturing method and masterbatch technology, applied in special tires, tire parts, transportation and packaging, etc., can solve the problems of poor operability, low carbon black yield, and insufficient carbon black dispersibility, and achieve easy preparation. , The effect of suppressing scattering and good operability

Inactive Publication Date: 2012-02-15
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since carbon black is not granulated, it is poor in workability, and there is a problem that the yield of carbon black in the masterbatch production process is likely to decrease due to scattering, etc.
In addition, in the manufacture of master batches, since ungranulated carbon black is dispersed in rubber latex only using a mixer, there is a problem that the dispersibility of carbon black is not necessarily sufficient.

Method used

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  • Process for producing rubber-wet masterbatch, rubber composition, and tire
  • Process for producing rubber-wet masterbatch, rubber composition, and tire

Examples

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Effect test

preparation example Construction

[0058]

[0059] In the present invention, the slurry (A) is preferably a slurry formed by dispersing a filler material in a dispersion medium using a high-speed shear mixer, and the filler material includes carbon black granules in an undried state, and At least one substance selected from silica and the inorganic filler represented by the aforementioned general formula (1) is used as needed.

[0060] In the present invention, the high-speed shear mixer used to prepare the slurry (A) is a high-speed shear mixer composed of a rotor and a stator part, and a high-speed rotating rotor and a fixed stator are arranged through a narrow gap, and the Spin to generate high shear rates.

[0061] High-speed shear means that the shear rate is usually above 2000 / s, preferably above 4000 / s.

[0062] Commercially available high-speed shear mixers include Homogeneous Mixer manufactured by Special Mechanized Industry Co., Ltd., colloid mill manufactured by PUC Company of Germany, Cavitron (e...

Embodiment 1

[0154] (1) Preparation of carbon black slurry

[0155] Throw into water the carbon black (N220: average diameter 1.7mm, average hardness 21.5cN, from the wet granulation of wet granulation of 52 mass % average water content rate 45 mass parts in dry weight conversion, average water content, when manufacturing carbon black The carbon black that takes out at the outlet of the granulator), with the high-shear mixer that Silverson Company manufactures, carry out the slurry processing of 30 minutes with the rotating speed of 4800rpm, make the slurry that contains carbon black of about 5 mass % of slurry concentration . Wherein, the preparation of carbon black slurry is carried out on the scale of 20kg slurry. The particle size distribution of carbon black in the slurry obtained at this time was volume average particle diameter mv=4.9 μm, D90 (90 volume % particle diameter)=8.3 μm.

[0156] In addition, the 24M4DBP oil absorption of carbon black (CB) before dispersion is 99mL / 100g...

Embodiment 2

[0162] (1) Preparation of carbon black slurry

[0163] Except having changed the slurrying processing time in Example 1 (1) into 20 minutes, it carried out similarly to Example 1 (1), and produced the slurry containing carbon black with a slurry density|concentration of about 5 mass %. The particle size distribution of carbon black in the slurry obtained at this time was volume average particle diameter mv=5.1 μm, D90 (90 volume % particle diameter)=8.4 μm.

[0164] In addition, the 24M4DBP oil absorption of carbon black (CB) before dispersion is 99mL / 100g, the 24M4DBP oil absorption of slurry recovery dry CB is 97mL / 100g, the retention rate of DBP oil absorption ([the 24M4DBP oil absorption of slurry recovery dry CB / The 24M4DBP oil absorption of CB before dispersion]×100) was 98%.

[0165] Furthermore, the slurrying energy index was 53.

[0166] (2) Manufacture of wet masterbatch

[0167] Using all the carbon black-containing slurries obtained in the above (1), a wet mas...

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Abstract

A process for efficiently producing a rubber-wet masterbatch which contains carbon black having improved dispersability in a rubber as compared with granulated dry carbon black products obtained by an ordinary wet process or with ungranulated carbon black. By using carbon black having high surface activity, rubber-reinforcing properties, wear resistance, and other properties can be improved. The wet masterbatch obtained has an intact yield of carbon black, and the carbon black has satisfactory handleability. Provided are a carbon black-containing rubber-wet masterbatch obtained by the process, and a rubber composition and a tire each obtained using the masterbatch. The process for producing a carbon black-containing rubber-wet masterbatch comprises the step of mixing a slurry (A) obtainedby dispersing a filler comprising carbon black with a rubber liquid (B) obtained by dispersing or dissolving a rubber ingredient, wherein the slurry (A) is prepared using a filler comprising undried carbon black granulated by a wet process.

Description

technical field [0001] The present invention relates to a method for producing a rubber wet masterbatch, a rubber wet masterbatch containing carbon black obtained by the method, and a rubber composition and a tire formed using the masterbatch. More specifically, the present invention relates to a method for efficiently producing a rubber wet masterbatch, a rubber wet masterbatch containing carbon black obtained by the method, and a composition and a tire made using the aforementioned masterbatch, Compared with the case of using commercially available dried carbon black granules and carbon black without granulation operation (i.e. loose carbon particles (fluffy carbon), hereinafter sometimes referred to as ungranulated carbon black), the In the method, the use of undried carbon black granules obtained by wet granulation in the preparation of the filler dispersion slurry containing carbon black can improve the dispersibility of carbon black in rubber and easily control its conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/22B60C1/00C08K3/04C08L21/00
CPCB60C1/00C08J3/226C08J2321/00C08J2407/00C08J2409/10C08J2421/02C08K3/04C08L2310/00
Inventor 中山敦泉池正明西浦史晃笠井豪原贤二八木敬
Owner BRIDGESTONE CORP
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