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How to Choose Amino Silicone Oil for Fabric?

How to Choose Amino Silicone Oil for Fabric?

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1. The application of amino silicone oil


Amino silicone oil emulsion has been widely used in the textile industry. The silicone finishing agents used in the textile industry are mainly amino silicone oil emulsions, but there are also other silicone emulsions such as dimethyl silicone oil emulsions, hydrogen-containing silicone oil emulsions, hydroxyl silicone oil emulsions and so on.


(1) Cotton, wool, silk fabric, rayon, artificial cotton, blended class basically have a soft and smooth feel, then we can choose silicone oil concentrate, amino silicone oil crude oil series or terpolymer crude oil series; such as amino silicone crude oil K-8034 /K-8033 and terpolymer crude oil K-111/780, etc.


(2) The overall feel of cashmere fabric and polyester reduction fabric is better than that of wool fabric. Mainly to improve its hydrophilic, we can choose polyether modified silicone oil and hydrophilic amino silicone oil, etc. High concentration compounding products such as hydrophilic silicone oil F-783, hydrophilic silicone oil F-802, etc., can be selected.


2. Amino silicone oil has four main parameters


Ammonia value, viscosity, reactivity and particle size. These four parameters basically reflect the quality of amino silicone oil, and will greatly affect the quality effect of the treated fabric, such as hand feel, whiteness, color and light, as well as the degree of difficulty of silicone oil emulsification.


The various functions such as softness, smoothness, and fullness that amino silicone oil gives to fabrics are mostly caused by the amino group in the polymer. The amino content can be indicated by the ammonia value, which refers to the number of milliliters of hydrochloric acid of 1 equivalent concentration required to neutralize 1g of amino silicone oil. Thus, the ammonia value is directly proportional to the molar percentage of amino content in the silicone oil.


The higher the amino content, the higher the ammonia value, the softer and smoother the finishing fabric feel, which is because the amino functional group is added, so that its affinity for the fabric is greatly increased, constituting a more regular molecular arrangement, and then give the fabric a soft and smooth feel.


It can make the vivid hydrogen in the amino group easily oxidized to form the coloring group, forming the yellowish or slightly yellowish light of the fabric. In the case of the same amino acid, it is obvious that with the addition of amino acid content (or ammonia value), the chance of oxidation increases and the yellowing is serious.


With the increase of ammonia value, the polarity of amino silicone oil molecules increases, which then provides favorable prerequisites for the emulsification of amino silicone oil. It can be made into microemulsions, while the selection of emulsifier and the coarseness and dispersion of particle size in the emulsion are also related to the ammonia value.


Viscosity is related to molecular weight and molecular weight distribution of polymer. Generally speaking, the greater the viscosity, the greater the molecular weight of amino silicone oil, the better the film formation on the surface of the fabric, the softer the feel, the better the smoothness, but the worse the permeability. Especially for strong twist fabric and fine denier fabric, amino silicone oil is difficult to penetrate into the fiber, affecting the fabric function. Too much viscosity will also make the emulsion less stable or difficult to make microemulsion.


Generally, we cannot adjust the goods by virtue of viscosity only. Generally, we balance the function of goods according to ammonia value and viscosity. If the ammonia value is low, it needs high viscosity, and then balance the soft function of the fabric.

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