Water-based adhesive for the manufacture of laminated cellulosic boards comprising monolayer graphene oxide, laminated cellulosic boards obtained therewith, and methods for production thereof

Abstract

A water-based adhesive for the manufacture of laminated cellulosic boards includes monolayer graphene oxide as a glue enhancer. The adhesive includes water, starch, and at least one further polymer selected from natural and soluble synthetic polymers. The adhesive further includes a glue enhancer with monolayer oxide in water and at least one further component selected from the group including stabilizing agents, gelling agents, thickening agents, anti-foaming agents, tackifyers, and damp-proofing resins, in accordance with the polymer(s).

1 . A water-based adhesive for the manufacture of laminated cellulosic boards, comprising:
 1) water;   2) starch;   3) optionally, at least one further polymer, selected from natural polymers or soluble synthetic polymers;   4) a glue enhancer, comprising monolayer graphene oxide in water;   5) at least one further component, selected from stabilizing agents, gelling agents, thickening agents, anti-foaming agents, tackifyers, damp-proofing resins, in accordance with the polymer(s).   
     
     
         2 . The water-based adhesive according to  claim 1 , wherein the at least one further component 5) is borax and NaOH, or a mixture of calcium hydroxide and sodium carbonate. 
     
     
         3 . The water-based adhesive according to  claim 1 , wherein the starch is maize starch, wheat starch, potato starch, pea starch, tapioca starch, or mixtures thereof. 
     
     
         4 . The water-based adhesive according to  claim 1 , wherein the at least one further polymer is a natural polymer selected from the group consisting of vegetable sources, protein sources or animal sources, preferably selected from dextrins, starches or albumins, or from any polymers extracted from casein, blood, fish, soybean, hides or bones. 
     
     
         5 . The water-based adhesive according to  claim 1 , wherein the at least one further polymer is a soluble synthetic polymer is selected from the group consisting of polyvinyl alcohol, cellulose ethers, methylcellulose, carboxymethylcellulose, and polyvinylpyrrolidone. 
     
     
         6 . Use of monolayer graphene oxide as a glue enhancer for a water-based adhesive comprising starch and at least one further polymer, wherein the at least one polymer is selected from natural polymers or soluble synthetic polymers, as defined in  claim 1 . 
     
     
         7 . A method for producing a water-based adhesive, comprising mixing starch, water and glue enhancer, said glue enhancer being a suspension of between 0.1 wt % and 0.001 wt % of monolayer graphene oxide in water. 
     
     
         8 . The method of  claim 7 , including the following steps:
 a) mixing starch into water under stirring and at a temperature between 20.0° C. and 30.0° C., to obtain a first mixture comprising between 20.0 wt % to 40.0 wt % of starch, and   b) adding to said first mixture a glue enhancer under stirring, said glue enhancer being a suspension of between 0.1 wt % and 0.001 wt % of monolayer graphene oxide in water, thereby producing a second mixture, comprising between 0.1 wt % and 10 −7  wt % of monolayer graphene oxide.   
     
     
         9 . The method according to  claim 8 , wherein in step a) the first mixture is stirred for at least 20 minutes, and in step b) the second mixture is stirred for at least 10 minutes. 
     
     
         10 . A method for producing a laminated cellulosic board, including the following steps:
 i) providing at least two cellulosic plies,   ii) applying, to at least a part of the surface of a cellulosic ply, an adhesive according to  claim 1 ,   iii) contacting the surface of a further cellulosic ply to first cellulosic ply of step ii), and   iv) repeating once or more times steps ii) and iii), to obtain a laminated cellulosic board.   
     
     
         11 . The method according to  claim 10 , wherein step iii) further comprises applying, to at least a part of the surface of the further cellulosic ply, an adhesive. 
     
     
         12 . The method according to  claim 10 , wherein the cellulosic ply is a paper or cardboard ply. 
     
     
         13 . A laminated cellulosic board, comprising at least two cellulosic plies attached one to another, wherein the at least two cellulosic plies are attached one to another with an adhesive according to  claim 1 . 
     
     
         14 . The laminated cellulosic board according to  claim 13 , wherein at least one of the cellulosic plies is a corrugated ply. 
     
     
         15 . The laminated cellulosic board according to  claim 13 , wherein at least one of the cellulosic plies is a laminated paper.