Preparation method of veneer decorative paper capable of purifying formaldehyde, and veneer decorative paper

Abstract

The invention relates to a preparation method of a veneer decorative paper capable of purifying formaldehyde, and the veneer decorative paper. The preparation method comprises following steps: 1, urea-formaldehyde resin, modified starch, water-soluble chitosan, ethene diamine, borax, ammonium sulfate, and an osmotic agent are mixed so as to obtain a dipping rubber solution; 2, the dipping rubber solution is adopted for dipping treatment of decorative raw paper, the excess dipping rubber solution is removed via extrusion, and drying is carried out at a mixed atmosphere of dried air and ammoniagas until the water content of obtained dipped paper is 10% or lower; 3, terpolycyantoamino-formaldehyde resin, ZnO, a dispersant, ammonium sulfate, the osmotic agent, and a mold lubricant are mixed so as to obtain a coating rubber solution; 4, the surface of the obtained dipped paper is coated with the coating rubber solution, and then drying is carried out at the mixed atmosphere of dried air and ammonia gas until the water content of the coated paper is 7% or lower. The veneer decorative paper possesses excellent formaldehyde capturing and eliminating capacity; the formaldehyde release amount of surface decorated artificial board prepared from the veneer decorative paper is extremely low; the veneer decorative paper is suitable for interior decoration, is safe, and is friendly to the environment.

Description

technical field [0001] The invention belongs to the technical field of facing decorative paper, and in particular relates to a preparation method of facing decorative paper capable of purifying formaldehyde and the facing decorative paper. Background technique [0002] Formaldehyde (HCHO) is a colorless gas with a special pungent smell, and it is also the most important, most widely sourced, and most harmful pollutant in indoor air. Excessive indoor formaldehyde concentration can cause permanent damage to human immune function, liver, lungs and central nervous system, and people's long-term exposure to low-dose formaldehyde can also cause chronic respiratory diseases, emphysema, chromosomal abnormalities, and fetal malformations Even cause nasopharyngeal carcinoma and allergic diseases. Therefore, the serious indoor environmental problems caused by formaldehyde have attracted people's attention. [0003] The source of indoor formaldehyde is mainly indoor decoration material...

AI Technical Summary

Problems solved by technology

Even if the formaldehyde emission of wood-based panel products is tested to be qualified when leaving the factory, the indoor formaldehyde concentration may exceed the standard due to the superposition of formaldehyde emission from various decoration and decoration materials after house decoration and decoration; However, with the change of seasonal temperature and humidity, the continuous release of formaldehyde from various decoration and decoration materials and the fluctuation of the release concentration may also cause the indoor formaldehyde concentration to exceed the standard again.

[0004] In the prior art, people try to eliminate indoor formaldehyde pollution through source control, and modify the adhesive with low formaldehyde, such as changing the ratio of formaldehyde in raw materials, reaction conditions, etc. Although the amount of formaldehyde released has decreased to a certain extent, most The modification method of adhesives has the disadvantages of high cost and complicated process, and it is difficult to realize industrialization; while other non-formaldehyde raw material adhesives, such as bio-glue, have general performance and cannot replace phenolic, urea-formaldehyde, and melamine-formaldehyde. The dominant position of resin glue in the application of board

In addition to adhesives, during the high-temperature hot-pressing process of board manufacturing, the decomposition of hemicellulose, the main component of wood, and the breakage of methoxy bonds in lignin will generate free formaldehyde that remains inside the wood-based board product. It is continuously released to the external environment throughout its life cycle, which cannot be completely eliminated from the source

[0005] The finishing treatment of wood-based panels has a certain sealing effect on the release of formaldehyde. The concentration of formaldehyde released from wood-based panels after decorating with decorative paper is lower than that of unfinished wood-based panels. However, the existing decorative papers only Free formaldehyde is blocked inside the fiber voids of wood-based panels, and has not been eliminated or dissipated; with the extension of the service life, the damage of decorative paper, cracking and deformation of wood-based panels, etc. will cause the release of free formaldehyde inside, which cannot completely solve indoor formaldehyde. pollution problem

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