Formaldehyde is one of the top ten chemicals with the highest yield in the world, with more than 3, functions. It is mainly used to make resin and synthetic plastics or rubber, and also has a large number of applications in building materials, wood processing, papermaking, textile, leather processing, medicine, paint, explosives and other industries. Formaldehyde is a colorless and pungent gas at room temperature. Formaldehyde is easily soluble in water, alcohol and other organic solvents. Formaldehyde in the market is generally 3% ~ 5% aqueous solution. 37% aqueous solution is called formalin, which has antiseptic effect.
1: the function of formaldehyde
Formaldehyde can be directly used as disinfection, sterilization and preservative, mainly used in organic synthesis, synthetic materials, coatings, rubber, pesticides and other industries. Its derivatives are mainly polyformaldehyde, phenolic resin and urea-formaldehyde resin, and its main products are polyformaldehyde, phenolic resin and urea-formaldehyde ester. Amino resin, urea-formaldehyde products, polyol, etc. With the rapid development of wood-based panel industry, there is a great demand for formaldehyde. < P > II. Function of formaldehyde < P > Formaldehyde is widely used in synthetic resins, surfactants, plastics, rubber, leather, paper, dyes, medicines, pesticides, photographic films, explosives, building materials and disinfection, fumigation and anti-corrosion processes. Formaldehyde is a versatile person in the chemical industry, but the use of anything must be restricted. There is a standard that, once used, exceeds the standard and limit, which may be harmful.
three: the function of formaldehyde
formaldehyde can be used as a fixing agent. The key point of effective fixation is that the reaction between formaldehyde and tissue protein is diverse and complicated, because it can combine with many different functional groups to form "Qiao Jian" in most cases. Formaldehyde has this cross-linking function. Formaldehyde can be mixed into simple or mixed stationary liquid. The simplest and easiest way to master is to take 1 ml of formaldehyde solution and add 9 ml of water, that is, 1% formalin. Of course, at present, the requirements for the use of fixatives are strict, and it is best to use buffer formalin fixatives, which is conducive to immunohistochemical staining in the future. From the histological point of view, formaldehyde is a good fixative, which has many advantages: less tissue shrinkage, less damage and good preservation of internal substances; Uniform fixation, strong penetration; Tissue hardening, increasing elasticity is beneficial to slicing; It can store fat and lipids; The cost is lower.
four: the function of formaldehyde
the application of textile industry and the use of formaldehyde should involve the process of clothing finishing with resin. In order to achieve anti-wrinkle, anti-shrinkage and flame retardant effects, or to maintain the durability of printing and dyeing, or to improve the hand feeling, formaldehyde should be added to the additive. At present, the application of formaldehyde in the textile industry is mostly cotton textiles, which are prone to wrinkle. Using formaldehyde auxiliaries can improve the hardness of cotton < P > V: The role of formaldehyde < P > Formaldehyde can be used to soak organisms and disinfect seeds. Formaldehyde is a substance released by decomposition above 6℃. Colorless, pungent, soluble in saprophytic bactericidal properties. The main reason of formaldehyde dissolution is that amino formaldehyde reacts with protein, which constitutes the organism (including bacteria). Water. 35%≤-4% formaldehyde aqueous solution, commonly known as formalin, has antiseptic and bactericidal properties.
formaldehyde is ubiquitous in nature. The annual average concentration of formaldehyde in urban air generally does not exceed . 3 mg/m3. Therefore, the threat of formaldehyde to people in nature does not exist, so there is no need to be afraid. "As long as it is within the standard range, a small amount of formaldehyde will not harm the human body.