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Wednesday, 18 September 2019
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Raw materials & technologies, Applications

Intumescent flame retardant and anti-dripping of PET fabrics

Thursday, 18 July 2019

In a new paper, chitosan (CH) and ammonium polyphosphate (APP) were used as the intumescent flame retardant system which was constructed on PET fabrics surface via the Layer-by-layer (LBL) assembly technique.

High flammability and dripping restrict the widely applications of PET fiber. Source: Sven Hoppe – stock.adobe.com.

High flammability and dripping restrict the widely applications of PET fiber. Source: Sven Hoppe – stock.adobe.com.

The flame retardancy and anti-dripping performance of the coated PET fabrics were determined by LOI values and vertical burning test. The results revealed that both the flame retardancy and anti-dripping performance of the LBL assembly coated PET fabrics were improved, particularly when the CH/APP bilayer was over 10 BL, the dripping phenomenon was eliminated. Alkali treatment of PET fabrics before LBL assembly effect on the flame retardancy and anti-dripping performance was investigated.

Improvement of flame retardancy and anti-dripping performance

The results indicated that alkali treatment of the PET fabrics would promote the combination of PET fabrics and the charged flame retardants. Thermogravimetric analysis (TGA) was used to investigate the thermal stability of uncoated and LBL assembly coated PET fabrics. The results of TGA revealed that LBL assembly coated PET fabrics would promote the char formation indicating the obviously condensed phase flame retardant action. The SEM images of the char residues revealed that LBL assembly coated PET fabrics would promote the formation of intumescent char residues with lots of microporous indicating the better anti-dripping performance.

The study is published in: Progress in Organic Coatings Volume 134, September 2019, Pages 162-168.

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