Properties of amino modified silicone oil and its effect on hand sensitivity（2）

2 viscosity

Viscosity is related to polymer molecular weight and molecular weight distribution.Generally speaking, the greater the viscosity, the higher the molecular weight of the amino silicone oil, in the film on the surface of the fabric, the better, feel more soft, smooth, the better, but its permeability is poor, especially for overtwisted fabrics and fine denier fabric closely, amino silicone oil is difficult to penetrate the fibers, the influence of fabric properties, viscosity is too large will worsen or difficult to make the emulsion stability of microemulsion.Generally not only by viscosity to adjust the product, often through the ammonia value and viscosity to balance the performance of the product.Usually a low ammonia value requires a high viscosity to balance the softness of the fabric.

Therefore, the smooth feel requires high viscosity amino modified silicone oil.However, during soft baking, some of the aminosilicone oils are cross-linked to form the film, thus increasing the molecular weight, so that the initial molecular weight of the aminosilicone oils is different from the molecular weight of the aminosilicone oils that eventually form the film on the fabric.Thus, the same amino silicone oil in different processing conditions, the final product smooth and smooth can have a great difference.On the other hand, the low viscosity amino silicone oil can also be added by crosslinking agent or adjusting the baking temperature to improve the feel of the fabric.Low viscosity aminosilicone oil increases permeability, and the advantages of high and low viscosity aminosilicone oil can be integrated by cross-linking agent and process optimization.General amino silicone oil viscosity range in 150 ~ 5000 centipoises.

But it is worth noting that the molecular weight distribution of amino silicone oil may have a greater impact on the performance of the product.The low molecular weight infiltrates into the fiber, while the high molecular weight is distributed on the outer surface of the fiber, so that both the inside and outside of the fiber are wrapped by the amino silicone oil, thus giving the fabric a soft and smooth feeling. However, the problem may be that the molecular weight difference is too large to affect the stability of the microemulsion.