Silicone emulsions are a form of silicone oil. The following is introduced from the aspects of silicone oil fabric soft finishing agent and silicone oil emulsion type defoaming agent.

First, silicone oil fabric soft finishing agent
The silicone emulsion is mainly used as a soft finishing agent for silicone oil fabrics. The first generation of silicone fabric finishes was a mechanical blend of dimethicone and hydrogenated silicone oil (and derivatives thereof). The second generation of silicone fabric finishing agent is a hydroxyl terminated polydimethylsiloxane emulsion, which is prepared by octamethylcyclotetrasiloxane monomer, water, emulsifier, catalyst and other raw materials under certain conditions. Aggregated. Since the polymerization and the emulsification are completed in one step, the invention has the advantages of short man-hour, high work efficiency, simple equipment, convenient operation, etc., and the obtained emulsion is very stable, the particles are very uniform, and the prepared polymer has reactive groups at both ends (hydroxyl groups). It can further react to form a film, which is beneficial to improve the application effect of the emulsion, which is not as good as mechanically emulsified silicone oil.

Hydroxy silicone oil emulsions can be divided into cationic, anionic, nonionic, complex ion and other types of emulsions depending on the surfactant used.

1. Cationic hydroxy silicone oil emulsion
The emulsifiers used in the polymerization of cation-type hydroxy emulsions are generally quaternary ammonium salts (octadecyltrimethylammonium chloride reported in foreign literature), and the catalyst is ammonium hydroxide. Cationic hydroxy emulsion can be used for finishing of various textiles, with improved fabric feel, improved fabric elasticity and smooth and crisp performance. Another unique advantage is that the ideal waterproofing agent for fabrics is combined with methyl hydrogen silicone oil emulsion. , waterproof performance and waterproof durability can reach a very high level, can be used as waterproofing agent for vinylon canopy canvas, waterproofing agent for polyester card.

2. Anionic hydroxy silicone oil emulsion
The anionic hydroxy emulsion is characterized by good compatibility in the fabric finishing agent and the emulsion is very stable. In particular, most of the additives in textile printing and dyeing are anionic. If cationic hydroxy milk is used, it is easy to cause demulsification and bleaching, and anionic hydroxy milk can avoid this drawback, so it is more popular with users and has a wide range of uses.

3. Composite ionic hydroxy silicone oil emulsion
Although cationic hydroxy emulsion is an excellent fabric soft finishing agent, this emulsion is not resistant to hard water and cannot be bathed with dimethylol dihydroxyethylene urea resin (2D) resin, catalyst magnesium chloride and anionic brightener. Used, so there are certain limitations in use. In addition, due to the poor stability of the emulsion, the silicone polymer is easily separated from the emulsion and floated on the liquid surface, commonly known as "bleaching oil". If the cationic and nonionic emulsifiers are used in the emulsion polymerization process, the disadvantages of preparing the hydroxy silicone oil emulsion by the cationic emulsifier can be overcome, and the prepared silicone emulsion can withstand hard water, can be combined with 2D resin, magnesium chloride and The brightener VBL is used in the same bath and has good heat resistance and freeze resistance.

4. Nonionic hydroxy silicone oil emulsion
Non-ionic hydroxy milk is more adaptable and stable than hydroxy-type milk, so many countries have been studying non-ionic hydroxy milk. For example, the new product UltrateX FSA produced by Ciba Cargill is a non-ionic emulsion of hydroxyl-terminated polydimethylsiloxane with a molecular weight of more than 200,000, which is more than the Dc-1111 anionic type of Dow Corning. Hydroxyl milk has taken a step forward.

5. Other reactive group silicone finishing agent
In order to meet the needs of advanced finishing of various types of fabrics, to improve the oil, antistatic and hydrophilic properties of silicone finishing fabrics, and to make chemical fiber fabrics have many advantages of natural fabrics, silicone workers have studied the introduction of other silicone molecules. A reactive group such as an amino group, an amide group, an ester group, a cyano group, a carboxyl group, an epoxy group or the like. The introduction of these groups has a special effect on the silicone fabric finishing agent, for example, the introduction of the silicone molecule into the amino group is suitable for the shrinkage prevention and soft finishing of the wool fabric; the introduction of the amide group is suitable for the antifouling finishing, and the softness is also greatly improved: introduction The cyano group has good oil resistance, and the anti-static effect of the copolymer of polyoxyethylene ether and silicone is good; the organic fluorine-modified silicone has many advantages such as oil repellency, antifouling, antistatic, water repellency and the like.