huanachemical

  1. Nonionic surfactants in textile production Surfactants were not needed in traditional textile production. Nonionic surfactants were adapting to the textile industry as different kinds of novel fibers were introduced to the industry. Materials such as composite fiber, profiled fiber and superfine fiber require nonionic surfactants to enhance wetting, reinforce effect and facilitates level dyeing.     In particular, nonionic surfactants  are mainly used in desizing,refining, and dyeing process in textile production. In desizing process, nonionic surfactants are used to produce wetting agent and desizing agent, for example penetrant and JEC. In refining process, nonionic surfactants are used as emulsifier to remove impurities. Surfactants that do not have cleaning properties, such as polyol esters are normally not used in the refining process. Furthermore, in dyeing process, nonionic surfactants are used in combination with anionic and cationic dyes due to their no...

  The problem of pharmaceutical excipients has plagued domestic pharmaceutical preparation manufacturers in recent years, and the quality control of excipients has attracted the attention of regulatory agencies and manufacturers. There are specific requirements for physical and chemical testing indicators of the excipient varieties in Chinese Pharmacopoeia, and studies related to the testing of excipients which have been carried out. Here is a case to share with you: polysorbate 80 fatty acid testing.   Polysorbate 80 is a nonionic surfactant, which is a polyoxyethylene 20 sorbitan oleate polymerized from sorbitan oleate and ethylene oxide. Because polysorbate 80 has a good solubilizing effect on lipophilic drugs, it is often used as a solubilizer or emulsifier for injections and oral liquids and is a commonly used excipient for pharmaceutical preparations. Polysorbate 80 is usually a mixture, and the composition of the fatty acid part in its molecular structure is mostly diff...

  It is obtained by the dehydration of sorbitol into anhydride and the esterification of anhydride and excessive stearic acid, or by direct heating and esterification of sorbitol and stearic acid in the presence of catalyst. Put 1mol sorbitol into the reactor, vacuumize it and heat it for dehydration. After dehydration, press 3mol of melted stearic acid and 1kg of sodium hydroxide catalyst into the reactor. Then increase the temperature slowly under the reduced pressure condition, raise it to 180℃ within 2h, then increase 10℃ per 1h, so that raise temperature to 210℃ after 3h, then hold the temperature at 210℃ for 5h, then raise temperature to 220℃ for reaction for 1h, and then take samples and measure the acid value. When the acid value reached 13 to 15, stop the process of esterification. Let it stand and cool it overnight. Then remove the coking substance at the lower layer, decolorize the upper layer with an appropriate amount of hydrogen peroxide, and finally heat up to 100℃ f...

  In many areas of production, as we all know, pulping and papermaking, fermentation, pharmaceutical and food, oil and natural gas, froth flotation, wastewater treatment, the dyeing of textiles, the preparation of phosphate, food and beverage production and other chemical production process, there are a lot of excess bubbles, which seriously affect the production efficiency and product quality.   Therefore, it is often necessary to add defoaming agent in the production process to inhibit the formation of bubbles. At present the commonly used defoaming agents include polyether defoaming agent and organosilicon defoaming agent. The deforming agent can be used in each working procedure in the papermaking industry with high defoaming efficiency, long defoaming time, good dispersibility, and less adhesion in the pulp and less resin obstacle. But its foam suppression effect is not that excellent, and this kind of defoaming agent has a high cost, and is easy to have scale. If you don...

  1. Introduction of polysorbate Polysorbate is an orange-yellow or light-yellow relatively viscous liquid with a slight bitterness. Polysorbate is often used as a component of drugs. For example, it can be made into capsule preparations or ointment preparations. In addition, polysorbate can be used as an emulsifier in the industry.   2. The use of polysorbate Polysorbate  has a wide range of uses. Polysorbate is a polyhydric alcohol type nonionic  surfactant. It has significant resistance to electrolytes and strong hydrophilicity. It is widely used in liquid, semi-solid and solid preparations as O/W emulsifiers, solubilizers, wetting agents, dispersants and stabilizers.   Polysorbate is a type of excellent O/W emulsifier, high concentration of electrolyte and changes in pH have little effect on its emulsification ability. It has a good emulsification effect on vegetable oil, mineral oil, animal fat, etc. It can be used in emulsions for external, oral and inject...

  Sorbitan trioleate is a light yellow viscous liquid at room temperature, almost insoluble in ethanol, ethyl acetate, petroleum ether and toluene, and insoluble in water. It gradually saponifies under strong acid or strong base conditions; stable in weak acid or weak base. It should be stored in an airtight container and stored in a cool and dry place.   Sorbitan trioleate  is used as emulsifier, wetting agent, dispersant, stabilizer, defoamer, antistatic agent, thickener, antirust agent, etc.; widely used in food, medicine, cosmetics, textile printing and dyeing auxiliary, paint and petrochemical industries. Pharmaceutical sorbitan trioleate is an excellent non-ionic surfactant, which can be used as emulsifier, solubilizer, suspending agent, moisturizing agent, etc. It has a wide range of uses in the pharmaceutical industry. In the emulsion droplets prepared by sorbitan trioleate, 95% of the oil droplets have a particle size below 5μ. Some fat-soluble vitamins such as A...