Method for eliminating free formaldehyde in adhesive for machining woodwork by using persulfate

Abstract

The invention relates to a method for eliminating free formaldehyde in tackiness agent for processing wooden wares, which relates to a method for eliminating free formaldehyde in tackiness agent for processing wooden wares by persulfate. The method is characterized in that the method comprises the following steps: firstly, preparing persulfate into persulfate solution whose mass concentration is 17%-20%, secondly, adopting one of the following two modes, first, adding persulfate solution in tackiness agent for processing wooden wares, wherein the adding amount of presulfate is 10%-12% of the weight of tackiness agent for processing wooden wares, second, adding persulfate solution after tackiness agent polymerization reaction is finished in the process for producing tackiness agent for processing wooden wares, wherein adding amount of persulfate is 10%-12% of the tackiness agent mass after polymerization reaction in producing tackiness agent for processing wooden wares, thirdly, evenly stirring, reacting 14-16 minutes under 45 DEG C to 90 DEG C. The method of the invention has the advantages of high efficiency, innocuity, environmental protection and simple method, the content of free formaldehyde in tackiness agent after being processed is only 0.02%, which is 0.3% which is further lower than national standard.

Description

technical field [0001] The invention relates to a method for eliminating free formaldehyde in adhesives for wood product processing. Background technique [0002] Formaldehyde is a highly toxic carcinogen identified by the World Health Organization. Adhesives such as phenolic resin, polyvinyl formal resin or melamine formaldehyde resin used in wood product processing all contain a certain amount of free formaldehyde, some even as high as 2% to 3%. These adhesives are widely used for gluing wood products or fiberboards, and the free formaldehyde in the furniture or plywood made will diffuse into the air, thereby seriously polluting the environment and causing poisoning to the human body. [0003] At present, adsorption and decomposition methods are usually used to remove formaldehyde gas. The adsorbents used are porous materials such as activated carbon, diatomaceous earth, and silicon dioxide. Some people also use titanium dioxide photocatalysis to degrade formaldehyde. Ho...

AI Technical Summary

Problems solved by technology

However, these methods usually only remove the formaldehyde gas released from indoor furniture and other wood products, and fail to solve the problem of free formaldehyde pollution from furniture and other wood products from the source.

For example, the adsorption and decomposition method used in the patent CN 03104741 (adsorption of harmful indoor gas formaldehyde, use of decomposing agent) reduces the free formaldehyde content in the indoor air in a short period of time, but after a while, formaldehyde gas will still be released from furniture, etc. It is continuously released from wood products, so this method cannot fundamentally solve the problem of formaldehyde pollution in wood products such as furniture

Other methods, such as adding a capture agent to the adhesive to chemically react with formaldehyde, thereby absorbing free formaldehyde, but this method also has negative effects, because some capture agents are mainly amines, phenols or amino compounds, which themselves also harmful to human health