Barrier red algae fiber, manufacturing method therefor, and barrier coated paper and barrier sheet comprising same

Abstract

The present invention relates to a barrier red algae fiber, a method for preparing the same, and a barrier coated paper and a barrier sheet comprising the same. The barrier coated paper according to the present invention not only has better oxygen barrier properties and dehydration properties during a coating process than conventional wood derived nanocellulose, but is also environmentally friendly because it has biodegradable properties.

1 . A barrier red algae fiber comprising oval red algae fibers having a cross-sectional major axis length of 50 to 500 μm. 
     
     
         2 . The barrier red algae fiber of  claim 1 ,
 wherein the fiber wall thickness of the oval red algae fibers is 50 to 500 nm.   
     
     
         3 . The barrier red algae fiber of  claim 1 ,
 wherein the oval red algae fibers are included in 50 wt % or more of the total weight of the barrier red algae fiber.   
     
     
         4 . The barrier red algae fiber of  claim 1 ,
 wherein the barrier red algae fiber is formed by red algae, and the red algae comprise one or more selected from  Eucheuma cottonii, Eucheuma spinosum  and  Gracilaria.      
     
     
         5 . A method for preparing a barrier red algae fiber, comprising:
 (1) adding 1,000 to 3,000 parts by weight of water to 100 parts by weight of a mixture of 0.1 to 5.0 wt % of sulfuric acid and 95 to 99.9 wt % of red algae, reacting the mixture at 60 to 120° C. for 1 to 5 hours to remove carrageenan or agar and obtaining a remaining red algae residue; and   (2) adding 400 to 600 parts by weight of water and 0.5 to 5.0 parts by weight of a bleaching agent to 100 parts by weight of the red algae residue obtained at above (1), adjusting pH between 3 and 5, and then reacting the red algae residue at 60 to 95° C. for 0.5 to 5 hours to bleach and wash it, thereby obtaining the barrier red algae fiber.   
     
     
         6 . The method of  claim 5 ,
 wherein the bleaching agent is one or more selected from chlorine dioxide, sodium hypochlorite, chlorine, ozone and oxygen.   
     
     
         7 . A barrier coated paper comprising,
 a paper; and   a barrier coating layer containing the barrier red algae fiber of  claim 1 , which is coated on at least a portion of a surface of the paper.   
     
     
         8 . The barrier coated paper of  claim 7 ,
 wherein the barrier coating layer further comprises a polymer,   and the barrier coating layer comprises 10 to 99 wt % of the polymer and 1 to 90 wt % of the barrier red algae fiber.   
     
     
         9 . The barrier coated paper of  claim 8 ,
 wherein the polymer is one or more selected from PVA (Poly vinyl alcohol), starch, nanocellulose, chitin, PLLA (Poly-L-Lactic Acid), sc-PLA (Stereo Complex Polylactic Acid), PHB (Poly-(3-hydroxy buthyrate)), PBS (Poly Butylene Succinate), PCA (Polycaprolactone) and PGA (Poly glycolic acid).   
     
     
         10 . The barrier coated paper of  claim 7 ,
 wherein the barrier coating layer having a basis weight of 1 to 100 g/m 2 .   
     
     
         11 . The barrier coated paper of  claim 7 ,
 wherein the barrier coating layer further comprises one or more selected from PAM (Poly amidoamine), a wet strength agent and a hydrophobic agent.   
     
     
         12 . The barrier coated paper of  claim 11 ,
 wherein the wet strength agent comprises one or more of epoxy emulsion and epichlorohydrin, and the hydrophobic agent comprises one or more selected from AKD (alkyl ketene dimer), ASA (alkenyl succinic acid) and rosin.   
     
     
         13 . A barrier sheet comprising the barrier red algae fiber of  claim 1 .