Cellulosic materials flameproofing

N 66.64% crysts, mp 225° was obtd as one of the products from reaction of cyanomeLamine with KOH NHj. Its substituted derivs such as Picrale, mp 258-60°(Ref 2) 290.5°(Ref 3) and Dipicrate, mp 257.7°(Ref 3) were also prepd as flameproofing agents. By depositing 10-40% of Guanylmelamine Pyrophosphate (obtd by reaction of guanylmelamine-HCl with di-Na di-H pyrophosphate) on a fabric, this compd was found to have fire retardant props for cellulosic materials (Ref 4)... 

The theories so far proposed for the flameproofing of cellulosic materials have been reviewed by Coppick(20). They may be broadly classified under four headings coating theories, gas theories, thermal theories, and chemical theories. 

The normal degradation of cellulose to the flammable tar, levoglucosan, is reduced and the charring of this compound is promoted. Shafizadeh and coworkers used thermogravimetric (TG) and thermal evolution analysis (TEA) data, to confirm two different mechanisms involved in flameproofing cellulosic materials ... 

The flameproofing of cellulose by bases like sodium hydroxide or calcium hydroxide can be explained on this basis. Examples may be cited where the elimination of water from carbohydrate materials by the action of bases is postulated (17). 

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