Introduction of organosilicon lotion
Hydroxyl silicone oil lotion can be divided into cation, anion, non-ion, composite ion and other types of lotion according to the different surfactants used.
1. Cationic hydroxyl silicone oil lotion
The emulsifiers used in the polymerization of cationic hydroxy emulsions are generally quaternary ammonium salts (reported in foreign literature as octadecyltrimethylammonium chloride), and the catalyst is ammonium hydroxide. Cationic hydroxyl emulsion can be used for post-treatment of various textiles, which has the properties of improving fabric feel, enhancing fabric elasticity, smoothness, and firmness; Its other unique advantage is that it is an ideal waterproof agent for fabrics. When used together with methyl hydrogen silicone oil lotion, its waterproof performance and waterproof durability can reach a very high level. It can be used as a waterproof agent for vinylon canopy canvas, polyester calico, etc.
2. Anionic hydroxyl silicone oil lotion
Anionic hydroxyl emulsion is characterized by good compatibility in fabric finishing agent and very stable lotion. Especially in textile printing and dyeing, most of the additives are anionic. If cationic hydroxyl emulsions are used, it is often easy to cause demulsification and oil bleaching. Anionic hydroxyl emulsions can avoid this problem, so they are more popular among users and have a wide range of uses.
3. Composite ionic hydroxyl silicone oil lotion
Cationic hydroxyl emulsion is an excellent fabric softening finishing agent, but this lotion is not resistant to hard water and can not be used in the same bath with dimethylol dihydroxyethylene urea resin (2D), catalyst magnesium chloride and anionic whitening agent, so it has certain limitations in use. In addition, due to the poor stability of lotion, silicone polymers are easy to be separated from lotion and float on the liquid surface, commonly known as "floating oil". If cationic and non-ionic emulsifiers are used in the process of lotion polymerization, the disadvantages of preparing hydroxyl silicone oil lotion with cationic emulsifiers can be overcome. The silicone lotion prepared can withstand hard water, can be used in the same bath as 2D resin, magnesium chloride and whitening agent VBL, and has good heat resistance and freezing resistance.
4. Non ionic hydroxyl silicone oil lotion
Non ionic hydroxylated milk has stronger adaptability and better stability than detached hydroxylated milk, so many countries are vigorously researching non ionic hydroxylated milk. For example, the new product UltrateX FSA produced by Cibajiaji Company in Switzerland is a non-ionic lotion of hydroxyl terminated polydimethylsiloxane with a molecular weight of more than 200000, which is a step ahead of the Dc-1111 anionic hydroxyl emulsion of Dow Corning Company in the United States.
5. Organic silicon finishing agents with other active groups
In order to meet the needs of advanced finishing of various fabrics, improve the oil resistance, anti-static and hydrophilic properties of organic silicon treated fabrics, and make synthetic fabrics have many advantages of natural fabrics, organic silicon workers have studied the introduction of other active groups such as amino, amide, ester, cyanide, carboxyl, epoxy groups, etc. on organic silicon molecules. The introduction of these functional groups gives organic silicon fabric finishing agents special effects. For example, the introduction of amino groups into organic silicon molecules is suitable for anti shrinkage and softening finishing of wool fabrics; The introduction of amide groups is suitable for anti fouling finishing and greatly improves flexibility: the introduction of cyanide groups has good oil resistance, and the copolymer of polyethylene oxide ether and organic silicon has good anti-static effect; Organic fluorine modified organosilicon has many advantages such as oil resistance, anti fouling, anti-static, and water resistance.