Preparation method and use method of modified bentonite environment-friendly formaldehyde removing agent

Abstract

The invention relates to a modified bentonite environment-friendly formaldehyde removing agent for removing free formaldehyde in urea-formaldehyde glue. A preparation method of the formaldehyde removing agent comprises the following steps of: in parts by weight, crushing 100 parts of calcium bentonite, screening the crushed calcium bentonite through a 200-mesh sieve, adding 2 to 3.5 parts of sodium carbonate into the screened calcium bentonite, mixing uniformly, spraying water of which the weight accounts for 10 percent of that of the calcium bentonite, fully mixing uniformly, sealing the mixture for 24 hours for sodication reaction, and air-drying naturally; and adding 0.5 to 2.5 parts of hydroxyethyl cellulose, 1.5 to 2.5 parts of ammonia chloride and 2.5 to 5 parts of sodium nitrite into 100 parts of a raw material subjected to sodication, crushing the mixture and stirring for 3 hours to obtain powder, and screening the powder through a 300-mesh sieve to obtain formaldehyde removing powder. A use method of the modified bentonite environment-friendly formaldehyde removing agent comprises the following steps of: in parts by weight, adding 10 parts of water into 10 parts of the formaldehyde removing agent, stirring at a high speed for 40 minutes, adding 10 parts of a suspension of the mixture into 90 parts of the urea-formaldehyde glue, raising the temperature to 50 DEG C, fully stirring for 30 minutes, standing for more than 24 hours, and thus fully adsorbing the formaldehyde in the urea-formaldehyde glue. The modified bentonite environment-friendly formaldehyde removing agent has good adsorption effect on the formaldehyde, and cannot influence the performance of the urea-formaldehyde glue.

Description

technical field [0001] The invention relates to an aldehyde remover for removing free formaldehyde in urea-formaldehyde glue, in particular to a method for preparing and using a modified bentonite environment-friendly aldehyde remover. Background technique [0002] Urea-formaldehyde glue is a low-cost and widely used adhesive, mainly used in the production of wood-based panels. However, the existing urea-formaldehyde glue generally has the disadvantage of high free formaldehyde content, and urea-formaldehyde glue with high free formaldehyde content is the main source of indoor pollution. At present, there are two forms of formaldehyde elimination methods, one is chemical elimination method, and the other is physical elimination method. The chemical elimination method uses various formaldehyde capture agents to destroy the molecular structure of formaldehyde, benzene and other harmful gases, and then gradually removes them, and finally achieves the purpose of removing formal...

AI Technical Summary

Problems solved by technology

However, natural bentonite is generally calcium-based bentonite, and its physical and chemical properties are not very ideal. It cannot achieve satisfactory results when applied to the removal of free formaldehyde in urea-formaldehyde. Aldehyde field