Preparation of a catalyst-free and water-blown rigid polyurethane foam from malic-co-citric acid-based polyols

编号 020031101

推送时间 20211004

研究领域 林产化工 

年份 2021 

类型 期刊 

语种 英语

标题 Preparation of a catalyst-free and water-blown rigid polyurethane foam from malic-co-citric acid-based polyols

来源期刊 Industrial Crops & Products

期 第311期

发表时间 20210524

关键词 Bio-based polyol;  Malic acid;  Citric acid;  Rigid polyurethane foam;  Thermal degradation behavior; 

摘要 Bio-based polyols (MCPs) were synthesized from 1,6-hexanediol, malic acid, and citric acid by a series of one-pot esterification reactions. Subsequently, water-blown rigid polyurethane foams (RPUF) were prepared using the MCPs and polyisocyanates by a catalyst-free method. The effect of the molar ratios of malic acid to citric acid on the foaming process, physicomechanical performance, and thermal stability were investigated. Moreover, the thermal degradation behavior of the MCP-based RPUFs was also investigated. The various MCPs exhibited high hydroxyl values (450-515 mg KOH/g) and low viscosities (1550-2150 mPa.s). In addition, citric acid had a positive influence on the compressive strength and thermal stability of the MCP-based RPUFs. When the ratio of malic acid:citric acid was 95:5, the corresponding RPUF had a density of 42.6 kg/m(3), a high compressive strength of similar to 191 kPa, a low thermal conductivity of 0.0365 W/(m K), and a high initial thermal degradation temperature (> 280 degrees C). Compared to commercial polyether polyols, the MCP-based, water-blown RPUFs demonstrated lower apparent densities, lower thermal conductivities, and higher normalized compressive strengths. These results demonstrated that malic-co-citric acid-based polyols could be an adequate substitute for petrochemical-based polyols for providing water-blown RPUFs with excellent comprehensive properties.

服务人员 尚玮姣

服务院士 宋湛谦

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