Forming a silicone emulsion and the application.-Iota

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News > Dynamic industry > Forming a silicone emulsion and the application.

Forming a silicone emulsion and the application.

Silicone emulsion is a form of silicone oil. The following from the silicone fabric softening agent and a silicone emulsion defoamer two aspects to introduce.
One. Silicone fabric softening agent
Silicone emulsion is mainly used as a silicone fabric softening agent. First generation silicone fabric finishing agent is dimethyl silicone oil and hydrogen-containing silicone oil (and derivatives thereof) of a mechanical mixture. The second generation of silicone fabric finishing agent is hydroxyl-terminated polydimethylsiloxane emulsion, it is made octamethyl siloxane monomers, water, emulsifiers, and other raw materials for the catalyst under certain conditions, the emulsion polymerization of. Because of polymerization and emulsion are done, so they have a short working hours, high efficiency, simple equipment, easy operation, and the resulting emulsion and very stable, very uniform particles, both ends of the polymer obtained with active groups (hydroxyl ) can be further reacted film, helping improve the application effect of the emulsion, which is mechanically emulsified silicone that fall.
Hydroxy silicone oil emulsion according to their use of surfactants can be divided into different cationic, anionic, nonionic, complex ions, such as several types of emulsions.
1. cationic hydroxy silicone oil emulsion
Cationic hydroxyethyl emulsion polymerization emulsifier is generally used quaternary ammonium salts (foreign literature is the octadecyl trimethyl ammonium chloride), the catalyst is ammonium hydroxide. Cationic hydroxyethyl milk can be used for a variety of textile finishing, with improved fabric feel, improved elasticity of the fabric and smooth, keeps the performance; it is another unique advantage of the fabric's ideal waterproofing agent, methyl hydrogen silicone oil emulsion and dried , waterproof and waterproof durability can deliver a very high level, used as a canvas canopy cover PVA water repellent, waterproof polyester cabo agent.
2. Anionic hydroxyl silicone oil emulsion
Anionic hydroxyl milk is characterized by the finishing agent compatibility is good, very stable emulsion. In particular, the large majority of textile dyeing auxiliaries as anionic, cationic hydroxyethyl if using milk often prone to breaking floating oil, milk and hydroxyl anion avoid this malady, it is more welcome by the user units, wide range of uses.
3. Hydroxy compound ionic silicone emulsion
Although cationic hydroxyethyl milk is an excellent fabric softening agent, but such emulsions impatience hard water, can not resin, magnesium chloride catalyst and anionic brighteners with the bath and dimethylol dihydroxy ethylene urea resin (2D) used, so there are some limitations on the use. In addition, due to the poor stability of the emulsion, silicone polymer easily separated out from the emulsion, floating on the surface, commonly known as "floating oil." If the emulsion polymerization process, the use of cationic and non-ionic emulsifiers can be complex, you can overcome the shortcomings of cationic emulsifier hydroxy silicone emulsions, silicone emulsions prepared hard water capability, with the 2D resin, magnesium chloride and Brightener VBL and other use, and has good heat resistance and freezing resistance.
4. Nonionic hydroxy silicone oil emulsion
Nonionic hydroxypropyl breast milk better than ionic hydroxyl adaptability, better stability, many countries have strong research nonionic hydroxy milk. Such as the Swiss company Ciba-Geigy new products UltrateX FSA, is a molecular weight of 200,000 or more hydroxyl head polydimethylsiloxane emulsion, than the United States Taokang Ning's DC-1111 Milk forward hydroxyl anion step.
5. Other active groups silicone finishing agent
In order to meet the needs of all types of fabric advanced finishing, finishing fabrics improve silicone anti-oil, anti-static and hydrophilic properties, and chemical fiber fabric has many advantages of natural fabrics, silicone workers studied the introduction of the silicone molecule other reactive groups such as amino, amide group, an ester group, a cyano group, a carboxyl group, an epoxy group and the like. The introduction of these groups makes silicone fabric finishing agent has a special effect, such as the introduction of amino silicone molecules suitable for wool shrink and soft finish; suitable for the introduction of the amide group stain finish, but also greatly enhance flexibility: Introduction cyano good oil resistance, polyoxyethylene ethers and silicone copolymer excellent antistatic effect; organic fluorine-modified silicone oil has a repellent, stain resistant, anti-static, water repellent, and many other advantages.
II. Silicone emulsion defoamer
Silicone emulsion defoamer is typically oil-in-water (O / W) emulsion, i.e. water is the continuous phase, a non-silicone oil continuous phase. It is the oil, emulsifiers and thickeners such as premixed, then gradually add water, stir, and finally in a colloid mill grinding repeated until a desirable emulsion.
Silicone emulsion defoamers are silicone defoamers most widely used, the largest amount of a defoamer. It is characterized by easily dispersed in an aqueous system can be widely used as defoamers aqueous phase system. In use, the emulsion is added directly to the foaming system, you can get a good defoaming effect. To improve the accuracy of anti-foaming emulsion effects and measurement, generally do not directly use more than 10% of concentrated oil emulsion: but it first with cold water or diluted to directly use the foaming liquid below 10%. Contraindicated hot or cold liquid dilution, otherwise it will cause the emulsion breaking. After diluting the emulsion stability will deteriorate during storage may also occur stratification (floating oil) phenomenon, that is breaking. So emulsion should run out as soon as possible after dilution. If desired, a thickening agent may be added to improve the stability of the emulsion. For a batch process operation, a silicone emulsion may be added before system operation, may also be employed batch additional ways; for process of continuous operation, the silicone oil emulsion should be continuously or intermittently added to the appropriate parts of the system.
When using emulsion defoamers, in particular considering the temperature and acid, alkali and other conditions of the bubble system, because silicone emulsion relatively fragile, beyond its scope, prematurely breaking the emulsion will become inefficient or ineffective (The amount of silicone oil emulsion, usually bubbling liquid weight of 10 ~ 100ppm (by silicone dollars). Of course, there are special circumstances less than 10ppm and 100ppm of its optimum dosage is mainly determined by the test.
General silicone emulsion defoamer mostly oil in water. According to the different types of silicone oil, silicone emulsion defoamer has the following types:
1. With dimethyl silicone oil as the main body of the silicone oil emulsion
Such dimethyl silicone defoamers by adding an emulsifier and water preparation, can be widely applied in respect of fermentation, food, paper, fibers, pharmaceuticals, synthetic resin.
2. In methylethoxy silicone oil as the main oil emulsion
Such silicone defoamers by Dimethylethoxy and ingredients made.
3. With ethyl silicone oil emulsion as the main
In recent years, silicone defoamers are moving towards a silicone polyether block copolymer (or graft copolymer) direction. Such antifoam Since the characteristics of both silicone and polyether, thus making defoaming force are significantly increased; a silicone polyether copolymer defoamer may be called self-emulsifiable silicone antifoam, it is silicone molecular chain block (or grafting) of hydrophilic ethylene oxide chains or ethylene oxide propylene oxide chain, a siloxane polyether hydrophobic portion and a hydrophilic together, such molecules have a larger polarity, as defoamers for spreading coefficient, can be dispersed evenly in the foaming medium, high anti-foaming effect, is a new type of highly efficient defoamers. Such without the use of self-emulsifying silicone emulsifiers, anti-foaming effect for some system is quite satisfactory, it is particularly suitable for those who should not use ordinary silicone oil emulsion silicone emulsion and general competence difficult situations.

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