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Method for preparing a masterbatch of diene elastomer and silica

一种二烯弹性体、水性二氧化硅的技术，应用在运输和包装、滚动阻力优化、特殊轮胎等方向，能够解决难加工性、填料差分散、相互作用增加等问题，达到好产率水平、良好分散的效果

Active Publication Date: 2014-06-11
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersibility of fillers and their increase in specific surface area are considered contradictory features
This is because the high specific surface area leads to an increased interaction between the filler substances, thus causing poorer dispersion of the filler in the elastomer matrix and also causing difficulty in processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] I. Measurement and Testing

[0037] I-1) Calculation of the molar content of calcium cations

[0038] The molar content of calcium cations is defined as the number of moles of calcium cations per unit surface area of ​​silica (in mol / m 2 Expressed), the unit silica surface area is defined as the weight of silica under consideration multiplied by the BET specific surface area.

[0039] Thus, for a metal salt of weight w1 (the molar mass of the metal salt is M1 and the number of metal atoms per salt molecule is N) plus silica of weight w2 (whether or not the silica has been dispersed in fact in aqueous solution) (the specific surface area of ​​the silica measured by BET is S2 (in m 2 / g expressed)), the molar content of metal cations (in mol / m 2 means) is equal to: [(w1 / M1)*N] / (w2*S2).

[0040]The BET specific surface area is determined according to the Brunauer-Emmett-Teller method described in The Journal of the American Chemical Society (Vol. 60, p. 309, February 1...

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PUM

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Abstract

The invention relates to a method for preparing a masterbatch of diene elastomer and of silica, involving the following successive steps: - preparing at least one dispersion of silica in water, - bringing an elastomer latex into contact with and mixing it into the aqueous dispersion of silica in the presence of a calcium salt in order to obtain a coagulum, - recovering the coagulum, - drying the recovered coagulum in order to obtain the masterbatch; the molar ratio of calcium cations, defined as being the number of moles of calcium cations in the calcium salt per unit area of silica is comprised between 1.19*10<-6> and 2.81*10<-6> mol / m2.

Description

technical field [0001] The present invention relates to the preparation of a masterbatch of diene elastomer and silica comprising at least one silica, a calcium salt and a diene elastomer latex, in particular a natural rubber latex. [0002] The term "masterbatch" is understood to mean an elastomer-based compound into which fillers and optionally other additives have been introduced. [0003] The invention relates in particular to the use of said masterbatch for the preparation of diene rubber compositions reinforced with inorganic fillers intended for the preparation of tires or semi-finished tires, in particular treads for these tyres. Background technique [0004] It is known that in order to obtain the best reinforcing properties imparted by fillers in tire treads and thus high wear resistance, it is generally advisable to have the fillers present in the final form which is as finely divided as possible and distributed as uniformly as possible in the elastomeric matrix....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C1/00C08J3/22C08J3/215
CPCC08K3/36Y02T10/862C08J2409/10C08J3/215C08J2321/00C08J2407/02B60C1/0016C08J2407/00C08J2421/02C08J3/2053C08J3/226C08J2307/02C08J2415/02B60C1/00C08J3/22C08K3/08C08L21/02Y02T10/86
Inventor B·德戈德马里G·拉法格J·贝里奥
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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