Amino-modified polydimethylsiloxane softener is easy to combine with hydroxyl group, carboxyl group and acylamino group on the fiber to form a stable silicon oxygen film due to the strong amino pole in the molecule, so as to effectively reduce the friction coefficient of the fiber surface.Different structural design of amino silicone oil can make the fabric soft, smooth, crisp and plump, flexible and other hand characteristics. At present, most of the amino silicone oil is diammonia type structure, which is easy to be oxidized to form azo structure chromophore due to its primary amino group at high temperature, so that the silicon oil film has a certain yellowing.
It is widely believed that this is the main reason for the yellowing or color change of the fabric, and the modification of amino silicone oil or adding antioxidants by acylation or etherification of the primary amino is used to reduce the yellowing or color change, but this is at the cost of the feel of the finished fabric.In fact, the above methods can not completely eliminate the color change of finished fabrics. We know that dyeing fabrics at high temperature, dye molecular activity intensifies, part of the combination of weak dyes from the fiber thermal migration or rising, dye in the outer layer (including fabric surface and air) diffusion if not hindered, the color of the fabric after Z will mainly be reflected in the surface dye color;If obstructed (silicone film formation), the dye subject to thermal migration will become concentrated on the fabric surface.
The color after Z is more complex. On the one hand, the dye concentration on the surface increases, on the other hand, the refractive index of light changes due to the silicone oil film, and the amino group is oxidized at high temperature, etc., so the color of the fabric will become dark and dark. To reduce the fabric color distortion caused by heat dye migration, conceived of in advance crosslinking method, before make dye sublimation transfer is seeping into the fiber and is blocked by already crosslinking silicone oil film, so can drop low setting appropriate baking temperature, also can effectively avoid higher temperature caused by amine oxide color changed, and the homemade activator AT accordingly.
Silicone products
Silicone oil has many special properties, such as low temperature viscosity coefficient, high and low temperature resistance, oxidation resistance, high flash point, low volatility, good insulation, small surface tension, non-corrosion to metal, non-toxic and so on.Because of these properties, silicone oils have excellent results in many applications.In all kinds of silicone oil, methyl silicone oil is widely used, is an important variety of silicone oil, followed by methyl phenyl silicone oil.Various functional silicone oils and modified silicone oils are mainly used for special purposes.
Properties: colorless, odorless, non-toxic and non-volatile liquid.
Purpose: there are various viscosity.It has high heat resistance, water resistance, electrical insulation and small surface tension.Commonly used for advanced lubricating oil, shock oil, insulating oil, defoaming agent, demoulding agent, polishing agent, isolator and vacuum diffusion pump oil, etc.Emulsion can be used for car tire glazing, dashboard glazing and so on.Methyl silicone oil Z is commonly used.After emulsification or modification, it is used in the smooth and soft feel finishing of textile finishing. Emulsified silicone oil is also added into the shampoo of daily care products to improve the lubrication of hair.In addition, there are ethyl silicone oil, methyl phenyl silicone oil, nitrile silicone oil, polyether modified silicone oil (water-soluble silicone oil) and so on.
