Full substitution of petroleum-based polyols by phosphorus-containing soy-based polyols for fabricating highly flame-retardant polyisocyanurate foams. (August 2018)

• Record Type: Journal Article
• Authors: Chen, Ming-Jun; Wang, Xu; Tao, Mei-Cen; Liu, Xing-Ya; Liu, Zhi-Guo; Zhang, Yan; Zhao, Cheng-Shou; Wang, Jun-Sheng
• Is Part Of: Polymer degradation and stability. Volume 154(2018)
• Page Start: 312
• Page End: 322
• Publication Date: 2018-08
• Subjects: Polyisocyanurate foam -- Soy-based polyol -- Morphology -- Thermal stability -- Flame retardancy -- Flame-retardant mechanism; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2018.07.001
• Languages: English
• ISSNs: 0141-3910

Abstract

Abstract: To obtain a substitute for petroleum-based polyols and simultaneously solve the flammability problem of polyisocyanurate (PIR) foams, a novel phosphorus-containing soy-based polyol (PCSO) was firstly synthesized. Then, PCSO was used to fabricate biomass flame-retardant PIR foam (P-PIR) by fully replacing petroleum-based polyol. The morphology, compressive strength, thermal conductivity, thermal stability, flammability, and flame-retardant mechanism were studied for the developed PIR. The incorporation of PCSO results in a slight decrease in the compressive strength and an increase in the flame retardancy of PIR foam. To further improve the flame retardancy, a commercial phosphorus-containing polyol (BY30) and an expandable graphite (EG) were added in the P-PIR system. The test results show that the decompositon of PIR was hindered after 330 °C and the char residue was significantly improved. In addtion, the limiting oxygen index of PIR was significantly increased to 35%, and the peak of heat release rate and total heat release were dramatically decreased by 65% and 87%, respectively. A synergistic flame-retardant effect was achieved by combining the gas phase action of PCSO and BY30 with the condensed phase action of EG. Highlights: A novel phosphorus-containing soy-based polyol (PCSO) is synthesized. PCSO can full substitution of petroleum-based polyols to fabricate P-PIR foam. P-PIR achieves self-extinguishing in vertical burning test. Highly flame-retardant PIR is obtained from PCSO, BY30 and EG. The flame-retardant mechanism is proposed.