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1. (WO2019025875) CHITOSAN-BASED FORMALDEHYDE SCAVENGER AND APPLICATIONS THEREOF IN WOOD-BASED PRODUCTS
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WHAT IS CLAIMED IS:

1. An adhesive composition, comprising:

an aldehyde-based resin selected from the group consisting of urea-formaldehyde resins, melamine-formaldehyde resins, melamine-urea-formaldehyde resins, phenol-containing resins, and mixtures, combinations, and sub-combinations thereof; and

a formaldehyde scavenger selected from the group consisting of chitosan, nano- chitosan, functionalized chitosan, and any mixture, combination, and sub-combination thereof.

2. The adhesive composition according to claim 1, further comprising:

a hardener selected from the group consisting of ammonium salts such as ammonium chloride, ammonium sulfate, ammonium persulfate, carbonate-based components such as propylene carbonate, potassium carbonate, sodium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, and any mixture, combination, and sub combination thereof.

3. The adhesive composition according to claim 2, wherein the hardener has an amount between 0.01 wt. % and 10.0 wt. % based on solid content of the adhesive composition.

4. The adhesive composition according to claim 2, wherein the adhesive composition has a pH between 4 and 13.

5. The adhesive composition according to claim 1, wherein the formaldehyde scavenger has an amount between 0.01 wt. % and 15.0 wt. % based on solid content of the adhesive composition.

6. The adhesive composition according to claim 1 , wherein the formaldehyde scavenger includes chitosan with an amount between 0.01 wt. % and 15.0 wt. % based on solid content of the adhesive composition.

7. The adhesive composition according to claim 1 , wherein the formaldehyde scavenger includes nano-chitosan with an average particle size of 10 nm to 110 nm and an amount between 0.01 wt. % and 5.0 wt. % based on solid content of the adhesive composition.

8. The adhesive composition according to claim 1, wherein the formaldehyde scavenger includes functionalized chitosan with an amount between 0.01 wt. % and 5.0 wt. % based on solid content of the total adhesive composition, the functionalized chitosan functionalized by formaldehyde absorbent groups.

9. The adhesive composition according to claim 8, wherein the formaldehyde absorbent groups include amino silane derivatives.

10. The adhesive composition according to claim 8, wherein the formaldehyde absorbent groups are selected from the group consisting of manganese oxide, melamine and phenol-based components, graphite/carbon-based components, and any mixture, combination, and subcombination thereof.

11. The adhesive composition according to claim 8, wherein the formaldehyde absorbent groups are alcohol functional groups, amide functional groups, or amine functional groups, or any mixture, combination, or sub-combination thereof.

12. The adhesive composition according to claim 1, wherein the formaldehyde scavenger includes functionalized chitosan with an amount between 0.01 wt. % and 5.0 wt. % based on solid content of the total adhesive composition, the functionalized chitosan functionalized by hydroxyl groups, amine groups, or both.

13. The adhesive composition according to claim 1, wherein the formaldehyde scavenger includes functionalized chitosan with an amount between 0.01 wt. % and 5.0 wt. % based on solid content of the total adhesive composition, and the functionalized chitosan are functionalized by alcohol functional groups, amide functional groups, amine functional groups, or any mixture, combination, or sub-combination thereof.

14. A method for reducing formaldehyde emissions from wood-based panels (WBPs), the method comprising:

forming an adhesive composition, by operations including mixing an aldehyde-based resin and a formaldehyde scavenger selected from the group consisting of chitosan, nano- chitosan, functionalized chitosan, and mixtures, combinations, and combinations thereof; forming a wooden layer by operations including blending the adhesive composition with wooden materials; and

hot pressing the wooden layer at a press temperature between 75 °C and 230 °C to obtain WBPs, and a specific pressure between 0.2 N/mm2 and 8 N/mm2.

15. The method according to claim 14, wherein blending the adhesive composition with wooden materials includes blending the adhesive composition with wooden materials in an amount between 50 g and 400 g per 1 m2 of the wooden materials.

16. The method according to claim 14, wherein blending the adhesive composition with wooden materials includes blending the adhesive composition with wooden materials in an amount between 3 wt. % and 49 wt. % based on solid content of the wooden materials.

17. The method according to claim 14, wherein the formaldehyde scavenger is in a form of a chitosan-based powder selected from the group consisting of chitosan powder, chitosan nanopowder, functionalized chitosan powder, and mixtures, combinations, and subcombinations thereof.

18. The method according to claim 14, wherein the formaldehyde scavenger includes functionalized chitosan with an amount between 0.01 wt. % and 5.0 wt. % based on solid content of the total adhesive composition, the functionalized chitosan functionalized by formaldehyde absorbent groups.

19. The method according to claim 18, wherein the formaldehyde absorbent groups include amino silane derivatives.

20. The method according to claim 14, wherein:

the formaldehyde scavenger includes functionalized chitosan with an amount between 0.01 wt. % and 5.0 wt. % based on solid content of the total adhesive composition, and

the functionalized chitosan are functionalized by alcohol functional groups, amide functional groups, amine functional groups, or any mixture, combination, or subcombination thereof.