Industry News

Analysis of the Mixing Characteristics of Butadiene Rubber

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Update time : 2020-04-14 10:54:34
The mixing characteristics of different types of butadiene rubber are also different, and the mixing characteristics of high-type butadiene rubber are also better, including better rolling property and dispersion, the temperature of the roll during the smelting should be lower than that of natural rubber, with an ideal temperature of 40~50℃. Medium cis requires lower temperature, low cis butadiene rubber because it can not crystallize processing performance is better, butadiene rubber sulfur dosage is lower than other diene rubber, which should be sulfur in butadiene rubber migration faster, easy to produce spray phenomenon. Butadiene rubber should be mainly mixed with two sections. The process and physical and mechanical properties of vulcanized rubber can be improved obviously by two-stage mixing. Such as using a mixed rubber conveyor belt cover plasticity is 0.33, using two mixings is 0.38, when the plasticity is 0.2 ~ 0.25, can produce roll-off phenomenon, with prepared two pieces of rubber, it also improved the tensile strength of vulcanized rubber. The softener should join after carbon black dispersion, which can improve the tensile strength of the vulcanizates and stretching stress, first in the mixer mixing butadiene rubber and styrene-butadiene rubber, then add the other ingredients, and can not obviously improve and rubber vulcanizates performance, if the raw rubber and carbon black into the at the same time, and then add softener, stretch stress and tensile strength can be improved. Our company provides industrial rubber flooring sheeting.
1. The mixing
Cis-rich butadiene rubber should be cold flow property, appropriate USES two method, roll WenYi low (40 ~ 50 ℃) from the appropriate is small, the first section of the first to add raw rubber, zinc oxide and anti-ager, cutter, mix and BoTong, then add a third of carbon black, stearic acid and oil, relaxing roller spacing and left in the carbon black, cutter, refined evenly, finally a slice of parking, the second section of the roller WenYi again below 40 ℃, first, add a gel, the cutter was mixed. Add sulfur, and after all, are mixed, the cutter will be thin. 
2. The mixer
It is suitable for soft open smelting, especially for mixing at high temperatures. Feeding capacity should be 10~ 15% larger than natural rubber.
(1) traditional mixing method. A. For general mixing, the debonding temperature should be controlled at 140 ~ 150 ℃. The feeding sequence is raw rubber → stearic acid → oxidant → antioxidant → carbon black (twice) → softener. It can also use the inverted method, its debinding temperature is 10 ~ 20 ℃ lower than the down roller method, which can save 40% of the refining time. The order is carbon black → softener → small medicine (including sulfur and accelerator) → carbon black → butylbenzene Rubber, butadiene rubber. B. Two-stage mixing, same as general two-stage mixing.
This mixing method can improve the performance of butadiene rubber and other rubber when used together. The method is to increase the content ratio of all components (including butadiene rubber) in the first mixing stage. Compared with the traditional mixing method, the viscosity of the rubber can be increased by 3~4 units, the tensile strength of vulcanized rubber can be increased by 2.5~ 3.0mpa, and the elongation can be increased by 70~ 100%, and the tear strength can be increased by 15kN/m.
The above information is provided by industrial rubber sheets manufacturers.

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