Resorcinol in high solid phenol-formaldehyde resins for foams production

作者：Liu, Juan; Chen, Ri-Qing; Xu, Yu-Zhi; Wang, Chun-Peng^*; Chu, Fu-Xiang^*

来源：Journal of Applied Polymer Science, 2017, 134(22): 44881.

DOI：10.1002/app.44881

• curing behavior
• foam
• mechanical properties
• phenol-resorcinol-formaldehyde resins (PRFRs)
• physicochemical properties

The acid curing agent content and foaming temperature could be reduced by improving the resol reactivity. In this study, highly active and solid phenol-resorcinol-formaldehyde copolymer resins (PRFRs) with different resorcinol/phenol (R/P) molar ratios and formaldehyde/(phenol+resorcinol) [F/(P+R)] molar ratios were synthesized through the copolymerization of resorcinol, formaldehyde, and phenol. Phenol-resorcinol-formaldehyde foams (PRFFs) were prepared with synthetic PRFRs. The results showed that PRFR-2 exhibited higher reactivity, faster curing speed, and better thermal stability. In addition, the foam produced with the PRFR-2 had improved mechanical and flame retardation properties and a compressive strength of 0.18 MPa, a flexural strength of 0.25 MPa, and a limited oxygen index (LOI) greater than 37%. The increased reactivity of the PRFRs correlated with the changing mechanical properties of PRFFs because of the effects of resorcinol and the molar ratio of formaldehyde to phenol and resorcinol.

• 出版日期2017-6-10
• 单位中国林业科学研究院; 中国林业科学研究院林产化学工业研究所