Formaldehyde application field
Formaldehyde chemical industry
It is used to produce POM. Generally, formaldehyde solution (55%) needs to be concentrated
Reduce to more than 75%, carry out the first step of polymerization to generate trioxane, then take trioxane as the reaction monomer, add a proper amount of dioxane as the comonomer, carry out the second step of polymerization to obtain long-chain polyformaldehyde, and finally finish the reaction by adding termination agent (carboxylic acid, etc.) through the closed chain end. After finishing, polyoxymethylene plastic particles are finally obtained.
Polyformaldehyde, also known as saigang, has been widely used in many industrial fields, such as industrial machinery, automobile manufacturing, electronics and electrical appliances, because of its excellent performance. With the development of technology, the performance of POM is still improving. DuPont, Baoli, China Bluestar Group, Shenhua Group and Yuntianhua group are all actively engaged in research in this field. The whole POM industry will have a great development space in the future.
Formaldehyde wood industry
It is used to produce urea formaldehyde resin and phenolic resin. The reaction is carried out by mixing formaldehyde and urea in a certain molar ratio to produce urea formaldehyde resin. The phenolic resin was formed by the reaction of formaldehyde and phenol in a certain molar ratio. The irreplaceable position of formaldehyde in wood processing industry is being replaced by MDI glue.
Formaldehyde textile industry
In order to achieve wrinkle resistance, shrinkage resistance and flame retardancy, or to maintain the durability of printing and dyeing, or to improve the hand feel, formaldehyde should be added to the auxiliaries in the production of clothing fabrics. More pure cotton textiles are used as formaldehyde printing and dyeing auxiliaries, because pure cotton textiles are easy to wrinkle, and the use of formaldehyde containing auxiliaries can improve the rigidity of cotton fabrics. Formaldehyde containing textiles, in the process of people's wearing and use, will gradually release free formaldehyde, through the human respiratory tract and skin contact to cause respiratory tract inflammation and skin inflammation, but also to stimulate the eyes. Formaldehyde can cause allergies and cancer. Manufacturers use formaldehyde containing dyeing aids, especially some manufacturers in order to reduce costs, use of formaldehyde content very high low-cost AIDS, very harmful to the human body.
Formaldehyde anticorrosive solution
35% - 40% formaldehyde solution, commonly known as formalin, has antiseptic and bactericidal properties. It can be used to soak biological samples, disinfect seeds and so on, but it is easy to make the samples brittle due to the denaturation of proteins.
The main reason why formaldehyde has antiseptic and bactericidal properties is that formaldehyde can react with amino groups on proteins of organisms (including bacteria).