Phenyl silicone oil has a certain lubricating and rust-proofing effect in metalworking fluids. The following is a detailed description of these two aspects:

1. Lubricating effect
Improvement of lubricating performance:
Phenyl silicone oil has excellent lubricating properties, which is mainly due to its special chemical structure and physical properties. With the increase of the mole fraction of phenyl, the high temperature resistance, radiation resistance and lubricity of silicone oil are improved.
During the metal processing process, phenyl silicone oil can form a lubricating film to reduce the direct contact between metal and metal, thereby reducing the friction coefficient and wear rate.
Improving load-bearing capacity:
Phenyl silicone oil can improve its load-bearing capacity by depositing a polysiloxane film on the metal surface. This film can be continuously renewed by silicone oil to maintain its lubricating properties.
It has been found that high-phenyl silicone oil has a tendency to resist film formation, so its lubricity may not be as good as dimethylsiloxane. However, its lubricity can be improved by adding lubricating additives that are miscible with silicone oil.

2. Anti-rust effect
Rust mechanism:
Phenyl silicone oil itself does not have a direct anti-rust function, but its lubricating and film-forming properties help reduce friction and wear on the metal surface, thereby indirectly reducing the risk of rust on the metal surface caused by friction.
At the same time, the lubricating film formed by phenyl silicone oil on the metal surface can also isolate air and moisture to a certain extent, slowing down the oxidation process of the metal.
Synergistic effect with other rust inhibitors:
In metalworking fluids, phenyl silicone oil is usually used with other rust inhibitors to form a more comprehensive anti-rust system. These rust inhibitors may include inorganic salts, organic acids, amine compounds, etc., which can synergize with phenyl silicone oil to jointly improve the anti-rust performance of metalworking fluids.

3. Application precautions
Choose the appropriate type of phenyl silicone oil:
Choose the appropriate type of phenyl silicone oil according to the specific needs and process conditions of metal processing. For example, for occasions requiring high-temperature lubrication, high-phenyl silicone oil can be selected; for occasions requiring low-temperature lubrication, low-phenyl silicone oil can be selected.
Control the amount of addition:
The amount of phenyl silicone oil added should be determined according to the formula and process requirements of the metalworking fluid. Too much addition may cause the performance of the processing fluid to deteriorate and even affect the processing quality; while too little addition may not fully exert its lubrication and anti-rust effects.

Pay attention to storage and use conditions:
Phenyl silicone oil should be stored in a light-proof, clean, cool, dry place, avoiding high temperature, humidity and direct sunlight. During use, personal protection should be taken to avoid inhalation or contact with skin and eyes.
In summary, phenyl silicone oil has a certain lubrication and anti-rust effect in metalworking fluids, but the specific effect needs to be determined according to the actual application situation. During use, the appropriate type of phenyl silicone oil should be selected, the addition amount should be controlled, and attention should be paid to storage and use conditions.