摘要
为改善酚醛泡沫性能,降低成本,以改性木质素、苯酚、多聚甲醛为原料合成可发性木质素酚醛树脂,通过发泡制备酚醛泡沫。当改性木质素取代苯酚的30%时,研究了缩合时间、缩合温度、催化剂用量、醛酚比和水量对树脂性能的影响,通过热重分析仪(TGA)和生物显微镜分别对酚醛泡沫的热稳定性和微观结构进行分析。结果表明:树脂合成的较佳条件为缩合时间80 min,缩合温度85℃,催化剂用量4%,醛酚比1.5,水量为25ml,泡沫具有较好的热稳定性和致密的微观结构;其力学性能较好,压缩强度为0.21 MPa,弯曲强度为0.15MPa;导热系数为0.030 W/(m?K),氧指数为38.2%,属于难燃型高效保温材料。
In order to improve the performance and reduce the cost of phenolic foams, the foamable lignin phenolic resin was synthesized by using modified lignin, phenol and paraformaldehyde as materials, and then lignin phenolic foams was prepared by foaming method. When the modified lignin substitutes phenols for 30%, the effects of conditions involving polymerization time, polymerization temperature, catalyst content, molar ratio of paraformaldehyde to phenols and water content on the properties of phenolic resins were investigated, thermal stability and microscopic structure of the phenolic foam were characterized by thermo gravimetric analyzer（TGA） and biological microscope. The results show that the optimal conditions are as follows： polymerization time is 80 min, polymerization temperature is 85℃, catalyst content is 4%, molar ratio of paraformaldehyde to phenols is 1.5 and water content is 25 ml. The foam has good thermal stability and microscopic structure; and the dynamic property is good, the compressive strength is 0.21 MPa, the flexural strength is 0.15 MPa, the coefficient of thermal conductivity is 0.030 W/（m？K）, the limited oxygen index is 38.2%, and it belongs to non-combustible and efficient insulation materials.
出处
《塑料科技》
CAS
北大核心
2014年第9期63-66,共4页
Plastics Science and Technology
关键词
木质素
酚醛树脂
酚醛泡沫
保温材料
Lignin
Phenolic resin
Phenolic foams
Insulation materials
