31 Question of the Day How is indoor formaldehyde transmitted?

To ask about the transmission route, first ask what the source of formaldehyde pollution is.

Wall paint, wallpaper, curtains, sofas and other decorative materials can volatilize formaldehyde, but the release cycle is short, 2 weeks to 2 months is about the same, and at most half a year will be volatilized.

Wood-based panels and furniture containing wood-based panels are long-term sources of formaldehyde pollution, with a release cycle of up to 3-15 years.

Obviously, the transmission route of indoor formaldehyde is from the material to the air. It should be noted that because furniture is a source of long-term formaldehyde pollution, and the furniture door is generally closed, the formaldehyde concentration in the space inside the furniture is higher than the formaldehyde concentration in the indoor air. This can be found through the detection of formaldehyde detection box, which also confirms that furniture is the source of formaldehyde pollution and is the focus of formaldehyde removal.

The wood itself emits very small amounts of formaldehyde under the action of temperature and humidity.

In the process of making glue, urea-formaldehyde resin inevitably retains a part of free formaldehyde and emits it outward.

During the curing process of wood-based panels, a part of the linear resin does not form a network structure and decomposes into free formaldehyde and emits it to the outside world.

Partially cured incompletely resin decomposes under the action of heat and moisture to form free formaldehyde, which is emitted outward.

Airborne. Formaldehyde is a gas that travels through the air. Therefore, the transmission route of indoor formaldehyde is airborne.

1.Man-made panels such as plywood, particleboard, and fiberboard used for interior decoration. Because formaldehyde has strong adhesion, and also has the function of strengthening the hardness of the board and the function of insect prevention and anti-corrosion, the glue used in the production of wood-based panels is urea-formaldehyde resin with formaldehyde as the main component, and the residual and uninvolved formaldehyde in the board will be gradually released to the surrounding environment, which is the main body of formaldehyde in the indoor air.

2.Furniture made of wood-based panels. This is because a large number of resin binders are used in the processing of man-made panels, and formaldehyde will be released in every link of the large number of adhesives, and the process of releasing formaldehyde from urea-formaldehyde resin, phenolic resin, melamine formaldehyde resin, etc. is a continuous process, and the release amount will change with the change of seasons and climate, which will affect the indoor environment for a long time.

3.Other types of decorative materials such as wallpaper, chemical fiber carpets, styrofoam, paints, coatings, etc., also contain formaldehyde and may be emitted to the outside world.

There are three ways of indoor formaldehyde transmission.

First, plywood, particleboard, fiberboard and other man-made boards, second, wood-based panels made of furniture, third, other types of decorative materials such as wallpaper, chemical fiber carpets, foam plastics, paints, coatings, etc.