This paper mainly introduces two characteristics of sodium dichloroisocyanurate. The first is stability. Laboratory research shows that sodium dichloroisocyanurate has good stability because there is a triazine ring in the molecules of chloroisocyanuric acid products, but it is well known that the triazine ring has high stability and relatively stable properties. Therefore, when there is a triazine ring substance, The properties of DCCNa are correspondingly stable. According to the measurement, after storing the dried DCCNa in the warehouse, the loss of effective chlorine is less than 1% after one year. For general substances, the loss of chemicals is between 10% and 50% after long-term storage, including completely intact. In comparison, the loss of mental stability of this product is even negligible, which is far lower than that of other products in the same industry.
The second feature is that in common use, the product is solid and can be made into white powder or particles. For transportation and packaging, it will save a lot of trouble and facilitate packaging and transportation. If the customer wants liquid, we can also transport the solid powder to remotely guide him to mix different proportions of liquid. The operation is simple and fast and saves many intermediate problems, It also facilitates the selection and use of users brings more convenience to customers, and increases the sense of shopping experience.
Dichloroisocyanuric acid method for synthetic sodium dichloroisocyanurate:
The first step of this method is to synthesize dichloroisocyanuric acid, and then react it with caustic soda to produce DCCNa. Firstly, the molar ratio of cyanuric acid to sodium hydroxide solution is 1:2 to neutralize it to form disodium cyanuric acid salt; Then chlorine gas is introduced to chlorinate the disodium cyanuric acid salt into dichloroisocyanuric acid slurry. After centrifugation and filtration, wet dichloroisocyanuric acid slurry is obtained and put into DCCNa mother liquor. Caustic soda is added in the massage molar ratio of 1:1 for a neutralization reaction. After cooling, crystallization and filtration, wet DCCNa will be obtained. After drying, powdered DCCNa or dihydrate compound is obtained. The method can co-produce dichloroisocyanuric acid, which is also a chlorinated isocyanuric acid disinfectant product. The solubility of dichloroisocyanuric acid is very low, and its filter cake can be fully washed to remove the salts. Therefore, the product has high purity and low salt content. The disadvantage of this method is that dichloroisocyanuric acid is highly corrosive, so titanium material with strong corrosion resistance or reactor and centrifuge lined with polytetrafluoroethylene must be used, resulting in increased equipment cost; Because the crystal of dichloroisocyanuric acid is small and difficult to separate, the requirements for separation technology are high; More caustic soda solution is needed to absorb the tail gas of chlorination section.
Sodium dichlorisocyanurate is widely used in industry:
The wool anti-shrinkage treatment agent
DCCNa can uniformly release hypochlorous acid in an aqueous solution, interact with the protein molecules of the wool scale layer, destroy some bonds in its protein molecules, and change its molecular structure, so as to prevent wool shrinkage. In addition, DCCNa can also be added to detergents such as washing powder to effectively prevent wool adhesion and pilling when washing wool products. The wool fabric treated by DCCNa has bright color, good hand feel,s and basically, will not shrink; Adding 2% ~ 3% DCCNa solution to wool or wool blended fiber and fabric soaking treatment additives can effectively prevent pilling and felting of wool and its products.
Bleaching in the textile industry
DCCNa is also widely used in the bleaching agents of natural fibers and synthetic fibers in the textile industry. The principle of bleaching is to destroy the pigments in natural fibers and synthetic fibers. DCCNa can uniformly release hypochlorous acid in an aqueous solution. Hypochlorous acid can change some chromogenic groups in the fiber, destroy the original pigment in the fiber through its conjugate bond, and change the wavelength of light absorbed by the fiber, so as to achieve the purpose of bleaching. Compared with the traditional bleach, DCCNa has great advantages. The traditional bleach can only be used under the condition of low temperature, because under the condition of high temperature, the speed of traditional bleach destroying the molecular structure of fiber will be accelerated, and the strength of fiber will decline rapidly under its influence. DCCNa can achieve a good bleaching effect even at low temperatures; In addition, DCCNa can destroy the molecular structure of natural fiber and synthetic fiber slowly, has a good bleaching effect, and the strength of fiber will not be greatly affected. In addition, adding DCCNa to bleach can also improve the hydrophilicity of clothes, remove the cotton pulp from clothes, reduce the degradation rate of cellulose, and improve the flexibility and ductility of clothes.
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