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通过对松香改性酚醛树脂的粘度、软化点、正庚烷容纳度等性能的分析,考察了酚醛树脂制备过程中不同烷基酚单体和缩合温度对松香改性树脂性能的影响。结果表明:随着烷基酚取代基碳链的加长,松香改性树脂分子链柔顺性增加,提高了树脂在正庚烷中的溶解性能,同时由于空间位阻增大,烷基酚与松香加成反应活性降低,产物的分子质量变小,粘度和软化点降低。随着缩合温度的升高,酚醛树脂缩合度逐渐增加,羟甲基含量减少,与松香反应后改性树脂的分子质量增大,正庚烷溶解性增加,软化点降低。
Through the analysis of the properties of rosin modified phenolic resin such as viscosity, softening point and n-heptane content, the effects of different alkylphenol monomer and condensation temperature on the properties of rosin modified resin during the preparation of phenolic resin were investigated. The results showed that with the increase of alkyl chain length, the molecular chain of rosin-modified resin increased its flexibility and increased the solubility of resin in n-heptane. At the same time, the steric hindrance of alkylphenol and rosin The addition reaction activity decreases, the molecular weight of the product becomes smaller, and the viscosity and softening point decrease. With the increase of condensation temperature, the degree of condensation of phenolic resin gradually increases and the content of methylol group decreases. The molecular weight of the modified resin increases with the reaction of rosin, and the solubility of n-heptane increases and the softening point decreases.