Welcome to Chemistry and Industry of Forest Products,

Chemistry and Industry of Forest Products ›› 2022, Vol. 42 ›› Issue (2): 71-79.doi: 10.3969/j.issn.0253-2417.2022.02.010

Previous Articles     Next Articles

Preparation and Application of Rosin Modified Siloxane-based Flame Retardant

Zhen HUANG1(), Shibo WANG2, Chunyu REN2, He LIU2, Xu XU1,*(), Zhanqian SONG2   

  1. 1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
    2. Institute of Chemical Industry of Forestry Products, Chinese Academy of Forestry, Nanjing 210042, China
  • Received:2021-02-04 Online:2022-04-28 Published:2022-05-06
  • Contact: Xu XU E-mail:njfuhuangzhen@163.com;xuxu200121@hotmail.com


In order to enhance the flame retardancy of polysiloxane, a novel flame retardant rosin grafted polysiloxane(RGSO) was synthesized by the amidation reaction of rosin and amino-polysiloxane. The synthesized flame retardant was employed as a part of the soft segment to produce flame-retarding rigid polyurethane foam(RPUF) by "one-pot" process. The flame retardant rigid polyurethane foams(RPUF-1-RPUF-4) were obtained with the rosin amounts of 5, 10, 15 and 20 g. The structure of the flame retardants was characterized by FT-IR and Py-GC/MS. The microstructure, thermal stability, flame retardant property and compressive strength of the RPUFS were analyzed. The results showed that the hydrogenated phenanthrene ring structure of rosin inhibited the gas release of cyclosioxane and promoted the compactness of the silica-rich carbon layer, and invested the materials with excellent flame retardant since it become shielding layer coated on the substrate surface and effectively insulated thermal and oxygen flame retardant. Compared with unmodified RPUF(P-RPUF), the limited oxygen index(LOI) value of the modified sample(RPUF-3) increased by 37.1%, and the peak heat release rate(PHRR) of the modified sample decreased by 44.8%. The fire growth rate(FIGRA) of the modified materials decreased from 10.99 kW/(m2·s) to 4.33 kW/(m2·s), which indicated that the introduction of RGSO could significantly enhance the flame retardant performance of RPUF. Meanwhile, the rigid hydrogenated phenanthrene ring structure of rosin improved the compressive strength of the modified RPUF. The compressive strength of RPUF-4 was 366.7 kPa, which was higher than that of S-RPUF(112.5 kPa).

Key words: flame retardancy, siloxane, rosin, polyurethane foam

CLC Number: