摘要:
A lubricating coating which is free from harmful heavy metals is formed on a premium threaded joint for pipes constituted by a pin and a box each having a contact surface comprising a threaded portion and an unthreaded metal contact portion (a sealing surface and shoulder) in order to provide the joint with galling resistance, gas-tightness, and anticorrosive properties such that the unthreaded metal contact portion is prevented from yielding even when the joint is made up with a high torque. The lubricating coating comprises one or both of a rosin and calcium fluoride; metal soap; wax; and a basic metal salt of an aromatic organic acid, and preferably it further includes a lubricating powder, magnesium carbonate, and/or a carbohydrate, particularly a cyclodextrin.
摘要:
A lubricating coating which is free from harmful heavy metals is formed on a premium threaded joint for pipes constituted by a pin and a box each having a contact surface comprising a threaded portion and an unthreaded metal contact portion (a sealing surface and shoulder) in order to provide the joint with galling resistance, gas-tightness, and anticorrosive properties such that the unthreaded metal contact portion is prevented from yielding even when the joint is made up with a high torque. The lubricating coating comprises one or both of a rosin and calcium fluoride; metal soap; wax; and a basic metal salt of an aromatic organic acid, and preferably it further includes a lubricating powder, magnesium carbonate, and/or a carbohydrate, particularly a cyclodextrin.
摘要:
A natural resin is dissolved in liquid oils and fats while a phosphate-based extreme pressure additive is evenly mixed in to prepare a paint composition. After the paint composition is applied to a high-strength hexagon head bolt (2) and a hexagon nut (3), centrifugal separation is performed for removal of excess paint composition and drying of the composition. Coating films can easily and quickly be formed. The high-strength hexagon head bolt (2) and the hexagon nut (3) thus provided with a coating film are fastened to each other by screwing. The heat and pressure generated during the fastening process cause the phosphate-based extreme pressure additive to react with the metal on the surface of the high-strength hexagon head bolt (2) and the hexagon nut (3) so that the phosphate-based extreme pressure additive in the film bonds to the metal. The coefficient of friction is reduced regardless of the smoothness of the surface of the high-strength hexagon head bolt (2) or the hexagon nut (3). As a low, stable coefficient of friction produces a stable torque-axial tension relationship, a stable fastened condition can easily be achieved.
摘要:
The present invention relates to the field of lubricant, and specifically provides a lubricant composition and its preparation method and use. The lubricant composition comprises a base oil and rubber particles having radiation crosslinked structure dispersed therein, wherein the base oil is continuous phase and the rubber particles are dispersed phase. The viscosity of the lubricant composition of the present invention can be effectively adjusted as temperature changes. As compared with the lubricant composition comprising chemically crosslinked rubber particles, it has a lower viscosity at low temperatures and a higher viscosity at high temperatures, and has a relatively high viscosity index, which can meet the application requirements at the temperature above 200°C. In addition, the lubricant composition of the present invention also has excellent antiwear and friction-reducing properties.
摘要:
A composition for forming a lubricating coating on a threaded joint for pipes which comprises calcium fluoride; metal soap; wax; and a basic metal salt of an aromatic organic acid, wherein the metal soap is a salt of a fatty acid with a metal other than an alkali metal and wherein the composition contains substantially no heavy metals.
摘要:
In one aspect, a self-lubricating component is provided for a pharmaceutical packaging assembly. The self-lubricating component comprises a polymer composition and an effective amount of a lubricating additive such as, for example, boron nitride. In another aspect, a pharmaceutical packaging assembly may be provided having a surface thereof coated with a lubricating composition comprising boron nitride. The pharmaceutical packaging composition may be, for example, a pre-filled syringe comprising a body (barrel) and a plunger assembly.