88 / 2021-06-15 15:05:28

PREPARATION OF MICRO-NANO LIGNOCELLULOSE-BASED HIGH-EFFICIENCY FLAME RETARDANT

Flame retardant,Organic-inorganic hybrid network,Lignin nanocellulose,Paper

Due to the promulgation of plastic restriction policy, paper materials have been widely used as the substitutes for plastic products. However, the flammable property of paper limits its application in various fields. It’s very necessary to add specific flame retardants in paper materials. Traditional organic flame retardants with high cost are always  unfriendly to the environment, while inorganic flame retardants always need a large quantity of dosage, which has a negative effect on the mechanical performance of the paper. As a new type of flame retardants, bio-based flame retardants exhibit excellent properties, such as high flame retardant efficiency, environmental friendliness, low dosage, and low toxicity. Particularly, cellulose-based flame retardants have attracted more and more attention, owing to its abundant storage, low cost and good compatibility with substrates. Chemical modification is one way to fabricate flame-retardants with high efficiency. However, at present, most of the reported cellulose-based flame retardants are prepared in organic solvents, resulting in high cost for recycling and serious pollution due to the high reactivity of the modifiers. There are only a few research related to the application of cellulose-based flame retardants in paper. In this work, based on the concept of green and environmental protection, we successfully constructed a kind of lignocellulose-based flame retardants (LFR) with organic-inorganic hybrid network in aqueous system. When the paper containing LFR was ignited, the paper quickly turned into char, and displayed a self-extinguishing phenomenon after moving away from the fire. At the same time, smoke emission of the burning paper was greatly reduced, and the mechanical strength of the paper was remarkably enhanced. In conclusion, this work provides a method for preparing a lignocellulose-based green flame retardant that can be uniformly dispersed in paper, and shows a reinforcing effect on paper in aqueous system. This facile method provides a green, efficient idea for practical applications.