A kind of wood lacquer for purifying formaldehyde and preparation method thereof

Abstract

The invention discloses wood lacquer for purifying formaldehyde and a preparation method thereof. The wood lacquer is prepared by mixing a component A with a component B in a mass ratio of (1:0.25)-(1:0.5), and then stirring the mixture uniformly, wherein the component A is prepared by putting alkyd resin and alcohol solvents into a reaction kettle under the protection of nitrogen, stirring the materials uniformly and heating the materials to 50-75 DEG C, adding first diluents, fillers, driers, wax powder, formaldehyde removal agents and an anti-settling agent in sequence, continuing stirring, maintaining the temperature at 40-70 DEG C and reacting for 15-60 minutes, and discharging the material after returning to the room temperature; the component B is prepared by putting second diluents into the reaction kettle under the protection of nitrogen, stirring and insulating the materials, putting curing agents, a levelling agent and a defoaming agent into the reaction kettle, insulating and stirring the materials, and discharging the material after returning to the room temperature. The wood lacquer has high formaldehyde removal efficiency and good durability, dispenses with recoating films, and is convenient to use.

Description

technical field [0001] The invention relates to a wood varnish, in particular to a wood varnish with the effect of removing formaldehyde and a preparation method thereof, belonging to the field of air pollutant purification. Background technique [0002] Formaldehyde is a flammable, highly reactive, irritating, colorless, toxic gas at room temperature. Most of the harm to the human body is exogenous formaldehyde. Exogenous formaldehyde can be roughly divided into two categories, one is formaldehyde when it comes into contact with humans, and the other is formaldehyde that is metabolized by substances such as methanol and methylamine when it comes into contact with humans. Common sources of formaldehyde include: construction and decoration materials, such as wooden boards (particleboard, blockboard, plywood, medium density fiberboard, large core board, etc.), wood adhesives, decorative materials that may emit formaldehyde (wallpaper, etc.) and furnishings (chemical fiber ca...

AI Technical Summary

Problems solved by technology

[0007] Although the effect of using nano-catalytic materials to degrade formaldehyde has been confirmed in the laboratory, on the one hand, the nano-particles are easy to agglomerate, which weakens the catalytic effect; Affect the light transmittance of the paint film, so the single use of nano photocatalytic substances such as nano-titanium dioxide as the coating of aldehyde-removing materials is mainly based on solid color paint (Huang Hongting, CN101831223A) and interior wall coating (Dong Wendou, CN102051123A)

There is another shortcoming of using photocatalytic materials to purify formaldehyde, that is, the condition for the formation of oxidative electron holes by nano-titanium dioxide is the irradiation of ultraviolet light, even natural light also contains ultraviolet light, but the indoor light is not sufficient, and ultraviolet light is exposed for a long time It has adverse effects on the human body and furniture. Therefore, the promotion and use of wood lacquers that use photocatalytic materials such as nano-titanium dioxide to remove aldehydes is still debatable.

[0008] Some water-soluble aldehyde-removing materials, such as utilizing the active hydrogen on the hydrazide to react with formaldehyde (such as: Yuan Minglong et al., CN1463753A; Wu Jiping, CN1457045A), although they react quickly and completely with formaldehyde in the aqueous phase system, they cannot react with formaldehyde in the solvent-based system. Especially in the coating system where isocyanate curing agent is used, the isocyanate curing agent will quickly react with such active hydrogen substances, which not only consumes the aldehyde removal group, but also makes the curing speed too fast, making it difficult to form a good film

Furthermore, although water-based paints are sought after for their low VOC and environmental protection, their disadvantages such as low solid content and relatively poor paint film performance make it difficult to promote water-based paints in the Chinese market, and also hinder the promotion of water-based aldehyde-removing paints.

[0009] Some spraying or volatile aldehyde-removing materials, such as sodium thiosulfate solution, Lauraceae plant extract (Peng Changrong, CN1431258A), need to disperse the materials in the indoor air during use, which will inevitably make people staying in the space at the same time Operators inhale some aldehyde-removing materials, but whether these materials have adverse effects on the human body is unclear

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