摘要
在P/F=1∶1.6情况下,分别以氢氧化钠、氢氧化钡、氨水、氧化锌为催化剂,催化苯酚与多聚甲醛合成高固含量酚醛树脂。研究了催化剂用量和种类对树脂黏度、固含量、游离酚、游离醛,以及固化后树脂力学性能的影响。结果表明:浸渍和胶合用酚醛树脂,以氢氧化钠制备的酚醛树脂的综合性能最优;氢氧化钠用量为3.5%时,树脂黏度为3.0Pa·s,固含量为86%,游离酚为4.0%,游离醛为0.4%且合成树脂预聚体的p H<9.5,为弱碱性。
In the case of P/F=1：1.6, a kind of phenolic resin with high solid content was synthesized by the reaction between phenol and paraformaldehyde under the catalysis of sodium hydroxide, barium hydroxide, ammonia, zinc oxide respectively. The influences of dosage and types of catalyst on the viscosity of resin, solid content, free phenol, free formaldehyde and the mechanical properties of cured resin were studied. The results showed that the phenolic resin which was synthesized with sodium hydroxide had optimal comprehensive performance for the use of impregnation and agglutination. When the sodium hydroxide dosage was 3.5%, the viscosity of resin was 3.0Pa＇s, the solid content was 86%, the free phenol was 4.0%, the free formaldehyde was 0.4% and the pH value was less than 9.5 which was alkalescent for synthesizing resin prepolymer.
出处
《化学与粘合》
CAS
2014年第6期403-406,462,共5页
Chemistry and Adhesion
基金
沈阳市科技局项目(编号:F13-161-9-00)
关键词
多聚甲醛
苯酚
酚醛树脂
催化剂
Paraformaldehyde
phenol
phenolic resin
catalyst
