Oil-resistant PU Polyurethane O-ring

Company Introduction:

Bomingyang Technology Co., Ltd., located in Xi'an, Shaanxi Province, is a technology-based enterprise integrating the research, development, production, and sales of rubber seals. The company mainly produces various rubber seals such as O-rings, X-rings, Y-rings, flat washers, V-rings, ED rings, C-rings, rubber strips, rubber balls, rubber retaining rings, and miscellaneous rubber parts.

Principle of Polyurethane:
Polyurethane PU seals are sealing components made from this material. A seal refers to a device that prevents fluid leakage, consisting of at least one pair of end faces perpendicular to the axis of rotation. These faces remain in contact and slide relative to each other under the influence of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, with the assistance of auxiliary seals.


Product Characteristics:
Contains strongly polar urethane groups, insoluble in non-polar groups, and exhibits excellent oil resistance, toughness, wear resistance, aging resistance, and adhesion. Materials can be produced from different raw materials to adapt to a wide temperature range (-50°C to 150°C), including elastomers, thermoplastic resins, and thermosetting resins. Not resistant to hydrolysis at high temperatures or alkaline media.

Performance and Applications:
Polyurethane oil seals are primarily used in hydraulic cylinders, offering easy installation and the ability to scrape off contaminants adhering to the piston rod. Green polyurethane oil seals have slightly lower hardness, while blue ones are harder and can withstand higher pressure. Polyurethane oil seals possess excellent physical and mechanical properties, wear resistance, and oil resistance, making them suitable for harsh working conditions. They effectively prevent the ingress of external impurities, thereby achieving superior sealing performance, and are commonly used in medium- to high-pressure hydraulic cylinders.

Chemical Composition:
Common monomers include toluene diisocyanate and methylene diphenyl diisocyanate. Polyols are divided into three categories: simple polyols (such as ethylene glycol and glycerol); polyester oligomers with terminal hydroxyl groups, used to prepare polyester-type polyurethane; and polyether oligomers with terminal hydroxyl groups, used to prepare polyether-type polyurethane. Polymerization methods vary depending on the material properties. For synthesizing elastomers, low molecular weight diols are first prepared, then reacted with an excess of aromatic isocyanate to form a prepolymer with isocyanate end groups. This is then chain-extended with butanediol to obtain thermoplastic elastomers. If aromatic diamines are used for chain extension and further cross-linking, cast elastomers are produced. Prepolymer chain extension with hydrazine or diamine yields elastic fibers. Prepolymers with a higher excess of isocyanate, when mixed with catalysts and foaming agents, directly produce rigid foam plastics. Soft foam plastics can be obtained in a one-step reaction by mixing monomers, polyethers, water, and catalysts. Reaction of monomers with polyols in solution produces coatings. Adhesives are prepared by mixing polyisocyanate monomers with low molecular weight polyesters or polyethers at the time of use, followed by reaction.

After-Sales Service:

All company products come with material certification; sincerity wins trust, patience gains understanding; details determine success or failure, service creates value. Service must be integrated throughout the entire enterprise, not limited to the final after-sales stage. Customized packaging and shipping methods are provided according to customer requirements, meeting different clients' cleanliness standards for products. Whenever you need, I am ready to provide satisfactory products. If fortunate enough to become your supplier, you need not worry about professionalism, quality, delivery, or service. Cooperating with us will make us a reliable and hassle-free qualified supplier.