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Hydraulic Oil Additive Wear, Have A Certain Tear Resistance Jun 14, 2017

Hydraulic Oil Additive for the hydraulic drive system as a working medium, from the energy transfer, conversion and control role, but also plays a hydraulic system components of the lubrication, corrosion, rust and cooling and so on. The seal in the hydraulic system acts to prevent leakage of fluid from the joint surface, to maintain pressure, to maintain energy transfer or conversion.

At present, most of the sealing materials used at home and abroad are high molecular elastomers, some special conditions also use plastic and various metals. But no matter what kind of material, should have the following performance:

1, with a certain mechanical and physical properties: such as tensile strength, tensile strength, elongation;

2, there is a certain degree of flexibility, hardness appropriate, and compression of permanent deformation is small;

3, with the working medium to adapt, not easy to produce swelling, decomposition, hardening;

4, wear, have a certain tear resistance;

5, with high temperature, low temperature aging performance.

However, without any sealing material, including all of the above properties, the need to work according to the environment, such as temperature, pressure, medium and movement to select the appropriate sealing material, and through the development of materials with the formula to meet certain requirements. Or the use of two or more composite materials or composite structure in the form of their own strengths, to achieve a more comprehensive effect.

Sealing effect formation: dynamic seal is divided into non-contact seal and contact seal. Non-contact seal is mainly a variety of mechanical seals, such as: graphite packing ring, floating ring seal, etc .; rubber composite seal and rubber and plastic combination seals are contact seals, relying on the pre-tightening force in the sealed cavity, Blocking the leakage channel and get the sealing effect. Hydraulic system seals are mostly static seal (end seal), reciprocating seal (piston, piston rod seal) and rotary seal.

Factors that affect the sealing effect: the choice of sealing structure and oil film formation, pressure, temperature, material compatibility, dynamic contact contact with the surface of the material, hardness, geometry, surface finish and so on.

Seal material and Hydraulic Oil Additive (liquid) compatibility:

One of the sources of particulate contamination of hydraulic fluids is the "debris" or "debris" that the seal material does not conform to the hydraulic fluid. The seal is damaged by the "debris" of the "debris" or is "extracted" out of the unbound inorganic and filled reinforcing material, so that the seal damage and failure, while the formation of pollution of oil caused by hydraulic The oil is deteriorated.

In the hydraulic system, the blade pump is widely used. In the state of its working pressure greater than 6.9MPa, the wear problem becomes prominent, so the anti-wear agent is used in the Hydraulic Oil Additive. In order to adapt to the hydraulic system near the high temperature heat source and the open fire, Flammable phosphate, water-glycol hydraulic fluid, oil-in-water and water-in-oil emulsions. (Such as anti-wear Hydraulic Oil Additive compound type of zinc-free type (no gray type), and other types of compound additives, Anti-wear Hydraulic Oil Additive compound agent, is the use of hydrocarbon sulfide, phosphate, phosphite, etc., as well as sulfur, phosphorus and nitrogen elements of the three SPN extreme anti-wear agent in extreme pressure industrial gear oil, But also to PS-based extreme pressure agent.

The reason why the seal is "swollen" or "extracted" is that the various chemical elements and their concentrations contained in the additive in the Hydraulic Oil Additive have different effects on the different sealing materials according to the principle of "similar compatibility" For example: ShellOmala320 gear oil and ShellOmala460 gear oil shows the polarity of the phosphorus (P) element concentration of about 300ppm, so the nitrile rubber due to the inclusion of acrylonitrile group with a polar, with excellent Of the oil resistance, but not suitable for the type of oil medium conditions.

With the continuous development of Hydraulic Oil Additive (oil) varieties, to improve the oil (liquid) performance of a variety of anti-wear, extreme pressure additives, metal deactivators, demulsifiers and anti-foam additives, the impact of the material seal Need to be verified by experiment.