Method for preparing a masterbatch of natural rubber and silica

A technology of silica and natural rubber, used in transportation and packaging, special tires, tire parts, etc.

Inactive Publication Date: 2012-10-10
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

Method used

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  • Method for preparing a masterbatch of natural rubber and silica
  • Method for preparing a masterbatch of natural rubber and silica
  • Method for preparing a masterbatch of natural rubber and silica

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0089] Preparation of 10 mg / l test control substance

[0090] A check control was prepared during each set of measurements in the same way as the above calibration standard by introducing different dosed amounts of 1 ml of a 1 g / l aluminum standard solution, thus enabling checking of the calibration. Test controls were not stored after use.

[0091] d)-4- Analysis by ICP-AES

[0092] Analysis order

[0093] 1 - calibration;

[0094] 2-10mg / l (magnesium) or 10mg / l (aluminum) test control substance;

[0095] 3-sample + blank test;

[0096] 4-E5 (20mg / l aluminum) test standard sample.

[0097] Calibration checks for the range 0-50mg / l aluminum:

[0098] Test control substance (theoretical value: 20mg / l)

[0099] Tolerance: 19.6mg / l<[Aluminum]<20.4mg / l.

[0100] Verification of the sequence of analysis in the range 0-50 mg / l aluminum (at the end of the measurement, to demonstrate the absence of drift):

[0101] E5 test standard sample (theoretical value: 50mg / l)

[0102]...

Embodiment 1

[0303] The purpose of this example is to demonstrate the proper operation of the method according to the invention, in particular the pH of the formulation measured for a given level of silica doping.

[0304] Tests E1, E2, E3 and E4 were carried out according to the method detailed in the previous section, in which:

[0305] - Natural rubber field latex from Société Africaine des Plantations d'Hévéas (SAPH; African Hevea Plantation Company) having 0.71% by weight of ammonia NH 4 (OH) and 37.2% by weight solids at 160°C for 30 minutes;

[0306] - aluminum doped silica having a doping level of 1% by weight; and

[0307] - an amount of silica of 50 phr when bringing the two dispersions into contact with each other.

[0308] In the procedure detailed above, the only difference between these four experiments was to vary the pH of the aqueous dispersion of doped silica to vary the pH of the formulation.

[0309] Thus, tests E1, E2, E3 and E4 differ from each other in the pH of t...

Embodiment 2

[0319] The purpose of this example is to demonstrate the suitable operation of the method according to the invention, in particular for the pH of the formulation measured at a silica doping level different from Example 1 .

[0320] According to the method described in detail in the previous section, experiments E'1, E'2, E'3 and E'4 were prepared with the same field latex as mentioned in Example 1 and with 2.5% by weight of Al-doped silica at a dopant level such that the amount of silica at which the two dispersions were in contact with each other was 50 phr.

[0321] As in Example 1, the only difference between these four experiments was the change of the pH of the aqueous dispersion of doped silica and thus the formulation pH while following the procedure detailed above, thus:

[0322] - in the case of E'1, the pH of the preparation is 3;

[0323] - in the case of E'2, the pH of the formulation is 5;

[0324] - in the case of E'3, the pH of the formulation is 7;

[0325] ...

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Abstract

The invention relates to a method for preparing a masterbatch of natural rubber and silica, including the following consecutive steps: doping the silica with an at least divalent metal element; preparing at least one dispersion of the thus-doped silica in water; contacting and mixing natural field-rubber latex and the aqueous dispersion of doped silica in order to obtain a coagulum; recovering the coagulum; and drying the recovered coagulum in order to obtain the masterbatch.

Description

technical field [0001] The present invention relates to the preparation of a silica / natural rubber masterbatch comprising at least one modified silica and a natural rubber latex. The term "masterbatch" denotes an elastomer-based composition into which fillers and possibly other additives have been incorporated. [0002] The invention relates in particular to the use of said masterbatch for the preparation of diene rubber compositions reinforced with inorganic fillers, said compositions intended for the production of tires or semi-finished products for tires, in particular for the manufacture of these tires tread. Background technique [0003] In order to obtain the best reinforcing properties and high wear resistance imparted by fillers in tire treads, it is known that this filler is generally suitable to be present in the elastomeric matrix in a final form that is as finely divided and as possible Evenly distributed. However, said conditions can only be obtained if the f...

Claims

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Application Information

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IPC IPC(8): C08J3/22C08K3/36C08K9/06B60C1/00C08L9/10
CPCC08J3/226C08K9/02C08J2407/00B60C1/0016C08J3/215C08K3/36C08J2409/00C08J2307/02C08L7/02C08L7/00
Inventor J·贝里奥B·德戈德马里斯G·拉法格
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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