Application background of sodium percarbonate
Sodium percarbonate (CAS No15630-89-4) has a molecular formula of 2NaCO3·3H2O, a molecular weight of 314.02, and its English name is SodiumPercarbonate, or SPC for short, commonly known as solid Hydrogen peroxide, also known as sodium percarbonate and solid hydrogen peroxide, is an addition compound of hydrogen peroxide and sodium carbonate. It decomposes to produce oxygen, water and sodium carbonate. Sodium perpyridinethione sodium carbonate not only has the function of liquid hydrogen peroxide, but also rapidly decomposes at lower water temperatures to release oxygen to achieve functions such as bleaching, decontamination, sterilization and removal of foreign matter; at the same time, the sodium carbonate generated by decomposition can improve the water quality. The pH value reduces the calcium and magnesium ions in hard water, softening the water, and as the pH value increases, more negative charges are generated between dirt and fibers, thereby repelling the dirt and fibers and improving the bleaching and washing effects.
As a representative of high-efficiency oxygen-based bleaching agents, sodium percarbonate has been widely used in washing (washing powder and color bleaching powder, etc.), printing and dyeing, textiles, papermaking, medicine and health due to its excellent bleaching activity and bactericidal performance. , household and personal care product formulations and other fields. Sodium percarbonate has shown excellent application effects and broad application prospects in the fields of washing (washing powder and color bleaching powder, etc.), printing and dyeing, textiles, papermaking, medicine and health, household and personal care product formulations. At present, the main factors restricting the application of sodium percarbonate are: the cost of use and the stability of some products cannot meet the requirements for application. However, with the improvement of people’s requirements for oxygen bleaching and environmental protection, as well as the improvement of sodium percarbonate production technology, sodium percarbonate will have wider application prospects and more economical use costs in the near future.
Applications of sodium percarbonate
Applications of sodium percarbonate 1. Application of sodium percarbonate in detergents (washing powder, color bleaching powder, etc.)
Dirt on fabrics can be divided into water-soluble dirt, fat dirt, color (dye) dirt, oily, protein and starch dirt. Detergents composed of surfactants and general additives can basically remove oily, protein and starch dirt. Removes dirt such as protein and starch. Bleach must be added to remove pigmented dirt, especially yellowing caused by residual dirt is the most difficult problem. For this reason, sodium perborate bleach has been used as a component of detergents in Europe and the United States since the 1960s. However, as the dangers of boron are becoming more and more known to people, and Europe and some other countries have successively issued boron restriction bans, as a new environmentally friendly bleach, sodium percarbonate has completely replaced sodium perborate in detergents.
Currently, sodium percarbonate is added to highly concentrated laundry detergents on the European and American markets, and sodium percarbonate is also added to many conventional laundry detergents. Typical washing formulas in Latin America and Europe contain sodium percarbonate bleach. In the context of consumers’ increasingly diversified demands for the efficacy of washing products, products developed in the market with increasingly powerful functions, and society’s environmental awareness gradually increasing, percarbonate The application of sodium in domestic high-end laundry detergents is expected to be greatly improved: there are currently many domestic brands of high-end brand detergents that add sodium percarbonate.
In order to better improve the effectiveness of sodium percarbonate in detergents, tetraacetylethylenediamine (bleach activator) has also been successfully added to laundry detergent and other cleaning and hygiene products. The amount added in Europe and the United States It is ordinary laundry detergent (TAED, 0.5% ~ 3%); concentrated laundry detergent (TAED, 3% ~ 8%); color bleaching powder (TAED, 8% ~ 20%); dishwashing detergent (TAED, 4% ~ 5 %). This greatly improves the low-temperature cleaning capabilities of the detergent while further enhancing the bleaching capabilities of sodium percarbonate. The products of Church & Dwight, a chemical raw material and chemical products manufacturing company founded in 1928, are a typical successful example.
The main active ingredient of its product OxiClean is sodium percarbonate, which is considered a household cleaning agent and clothing detergent with powerful stain removal properties. Based on more than 50,000 consumer surveys, OxiClean products were named the best sanitary cleaning products in the 2010 Best New Product Awards by the most famous home furnishing magazine in the United States ().
Application of sodium percarbonate 2. Application of sodium percarbonate in dental care products
Sodium percarbonate is a high-quality tooth color-preserving active ingredient. After 18 months of clinical research, it has been confirmed that there is no significant difference in the teeth whitening effect of Crest Nighttime Products containing 19% sodium percarbonate and Crest Whitening Teeth Strips containing 6% hydrogen peroxide. Long-term follow-up studies also show that Crest Night Effect products will not cause obvious side effects. When evaluating these two Crest products, “Bei Cai Fu” magazine pointed out that Jiagu’s Whitening Teeth Strips and Crest’s Nighttime Effect once achieved a retail sales of US$300 million and a market share of 70%.
At the same time, sodium percarbonate also has great application potential in bleaching discolored pulpless teeth. After the tooth becomes pulpless, the tooth body becomes dark gray or brown, dull and unsightly. Laboratory research results from the Federal University of Pelotas confirmed that sodium percarbonate plays a role in bleaching discolored pulpless teeth, and its cytotoxicity and genotoxicity are comparable to those of common discolored pulpless teeth such as hydrogen peroxide and carbamide peroxide.
Applications of sodium percarbonate 3. Applications in other fields
1) Application as sterilization and disinfection products
Sodium percarbonate can be used to kill common germs such as Escherichia coli, Staphylococcus aureus and hepatitis virus, so it can be used as a disinfectant in hospitals and public health facilities.��Carry out the reaction in the presence of a stabilizer, control the reaction temperature below 5°C, and then add a salting out agent to crystallize sodium percarbonate. After centrifugal separation and air drying, the finished product of sodium percarbonate is obtained. The products produced by this method have good stability, mature technology, and are widely used in industry. At present, there are spray method, low temperature crystallization method and solvent method for production. The reaction formula is as follows:
The reaction process is as follows:
Because sodium percarbonate is unstable and easily decomposes when there are impurities such as heavy metal ions in the system and under high temperature and high humidity conditions, in addition to reacting under low humidity, a stabilizer must also be added. Research has found that adding organic compounds and various inorganic salt stabilizers during the reaction between sodium carbonate and hydrogen peroxide can greatly improve the stability of the sodium peroxycarbonate product.
There are many types of stabilizers added, mainly including inorganic compounds and organic compounds. Inorganic compounds include: 1) Phosphoric acid or phosphates. Such as orthophosphoric acid, phosphoric acid, sodium phosphate, sodium dihydrogen phosphate, sodium hexametaphosphate, sodium pyrophosphate, etc.; 2) Alkali metal or alkaline earth metal salts. Such as sodium sulfate, magnesium sulfate and magnesium chloride, etc.: 3) Silicates. Such as silicate, sodium silicate, etc.; 4) Boric acid or borates.
Such as boric acid, sodium metaborate, etc.; organic compounds include: 1) organic amine compounds. Such as ethylene diamine acetate, diethylene triamine pentaacetate, etc.; 2) Alcohol compounds. Such as polyethylene glycol and polyethylene glycol compounds; 3) chelates and surfactants, such as 8-hydroxyquinoline, a-benzoin oxime, etc.: 4) Aliphatic amino acids and their salts, Such as ethyl acid, gluten, gelatin, etc.; 5) Aromatic compounds. Such as magnesium sulfonate, magnesium sulfate salt of higher fatty alcohol, etc.; 6) ammonium salt carboxylates, such as EDTA; 7) nonionic surfactants. Such as higher alcohols, higher fats, glycerides, etc.
In production, the selection of stabilizers should be based on the price and availability of raw materials. A combination of one or more inorganic and organic compounds should be used, which has a better stabilizing effect than using a single stabilizer. In terms of general raw materials and operating conditions, the amount of inorganic compounds added is generally 0.01% to 1.0%, and the amount of organic compounds added is 0.02% to 0.5%. The stabilizer can be added by spraying on the surface of the finished product or added during the reaction process. Using the above stabilizer, the available oxygen content of sodium peroxycarbonate can be high, the composition of hydrogen peroxide and sodium carbonate in the crystallization is close to the theoretical value, the product quality is good, and the storage stability is good.
