Basic properties of Spin Finish Oil

We, NINGBO LUCKY CHEMICAL INDUSTRY Co., Ltd start new project on Spin Finish Oil.

Spinning oil is added to polyester during spinning, so what kind of oils are generally used in polyester spinning oil?

There are many kinds of polyester filament oils, including POY, FDY, DTY oils, conventional spinning oils, drawing oils, textured silk oils, and industrial silk oils. They can play the functions of clustering, lubrication, reducing friction coefficient, antistatic, etc., but they have their own special functions and adaptability. Even for the same type of filament, due to different processing equipment and post-processing processes, the required oil properties will also be different.

Now we mainly produce POY, FDY, DTY oils.

Basic properties of Spin Finish Oil

01

Smoothness

Smoothness, or lubricity, is essentially the frictional property of oils. It is often expressed by the coefficient of static friction (μs) and coefficient of dynamic friction (μd) between silk and silk (F/F), silk and metal (F/M) and silk and rubber (F/R) after oiling.

Generally speaking, after the better oil agent is applied to the silk, the static friction coefficient of F/F should be relatively large, so that the silk has good bundling, winding and forming, and excellent unwinding performance. There is no special requirement for the coefficient of dynamic friction of F/F, but during false twist deformation, if the silk slips, it is easy to deform.

It is better for the static friction coefficient of F/M to be smaller, and the smaller the dynamic friction coefficient, the better, which can reduce the friction between the wire and the metal, reduce the hair and broken ends, reduce the wear of the wire on the metal, and improve the performance of the wire. processing and weaving properties. The static and dynamic friction coefficients of F/R are appropriate, because in the process of processing, rubber parts are used to increase the holding force on the wire, and the friction coefficient is too small, which is easy to slip. The smoothness is determined by the performance of each component of the oil agent, and has a certain relationship with the lubrication condition.

When the oil content is high (0.5% to 1.0%), the lubrication is fluid lubrication. In fluid lubrication, the coefficient of friction increases with the increase of oil viscosity and oil content.

The lubrication with the lowest oil content and the lowest coefficient of friction is critical lubrication. At high speed and high contact pressure, it is very important to maintain critical lubrication. Under critical lubrication conditions, in addition to the viscosity of the oil affecting the friction coefficient, the oil film strength (interfacial adsorption force, intermolecular cohesion) also has a great influence on the friction coefficient. The oil film strength is high and the friction coefficient fluctuation is small.

02

Antistatic

Polyester is a good insulator. When it is rubbed during processing and use, it will generate negative static electricity due to the accumulation of charges.

Static electricity loosens the yarn and deteriorates processability. Therefore, the fiber after oiling should have antistatic property. There are usually three antistatic mechanisms: namely, to enhance the hygroscopicity of fibers; to reduce friction; and to neutralize the generated charges. Three mechanisms can work simultaneously. The easiest way to measure the antistatic property of oil is to measure the specific resistance of the oiled thread, and also to measure the frictional charge of the thread.

03

Heat resistance

For filaments subject to thermal processing (stretching, false twisting, etc.), the heat resistance of the oil applied is very important. Oils with poor heat resistance will decompose at high temperatures and the physical properties of the oil will change.

The volatilization of the oil agent at high temperature reduces the amount of oil applied and pollutes the environment. The tar or oil droplets produced will also affect the operation. The heat resistance of the oil agent can be measured by the volatilization reduction method, that is, the oil agent is placed in an oven at 220°C for 8 hours, and its volatilization and decomposition loss are measured.

04

Interface characteristics

The oil agent must have certain emulsifying properties. It is required that the emulsification of the oil agent is stable, the surface tension of the emulsion is low, and the viscosity is small. It can be evenly attached to the fiber surface. If the interface characteristics are not good, even if other performances are good, it cannot meet the requirements of use.