The compatibility of different oil with synthetic rubber

 

Rubber in mineral oil volume increases, the increased volume order has several kinds of rubber, natural rubber > butyl rubber styrene-butadiene rubber chloroprene rubber.

Expansion of several kinds of rubber in mineral oil, along with the augment of aniline point of oil reduced, with NBR in mineral oil volume basic unchanged.

 

Natural rubber is not resistant to oil, mineral oil for general rubber expansion effect is mainly due to the aromatic hydrocarbon or no more side chains inside the alkanes, because they are the easiest polarization and interact with the polarity of the rubber base, and alkanes and naphthene with long side chain can lead to reduce rubber quality.

When oil contact with the rubber, simultaneously two processes: precipitation of plasticizer and the absorption of aromatic hydrocarbon.

Rubber after soaking is weight loss or weight gain an advantage depends on what kind of process.

Aromatic hydrocarbon content of aromatic hydrocarbon increased, especially polycyclic short side chains of plasticizer dissolve strengthen, results in a rubber formed of many tiny holes, these holes were alkanes and naphthene, they blocked the rubber branch molecules, so that the rubber show the weight loss.

As to the content of aromatic hydrocarbon in petroleum from aniline point of reflection, aniline point higher oil content of aromatic hydrocarbon is less, the swelling of rubber is low, and even have a tendency to make it shrink.

 

2, the compatibility of different oil and synthetic rubber

 

Different types of oil products of various kinds of synthetic rubber in the harsh conditions of compatibility: ester oil and aromatic oil has very strong expansion effect to NBR, and unstable;

Mineral oil of nitrile rubber almost no effect;

Silicone oil contraction of NBR.

 

3, content of acrylonitrile in nitrile rubber for rubber expansion value

 

Rubber expansion value with the increase of the acrylonitrile content in the rubber into plummeted, linear slope has nothing to do with the composition of oil.

 

4, base oil for rubber expansion value and grease on the relationship between the rubber expansion value

 

Grease on the expansion of the rubber value determined by the base oil and base oil for rubber test results show that the expansion value and grease on the expansion of the rubber there was no significant difference, so can according to the expansion of the base oil for rubber values determine the composition of base oil in the grease.

The compatibility of different oil and rubber.

Preparation of compatible with some kind of rubber to grease, need to choose the appropriate base oil, or select different rubber expansion oil mixed in certain proportion to prepare in accordance with the requirements of the use of grease.