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在苯酚和甲醛原料中加入一定量的SiO2粉体改性剂,可成功制备出改性热塑性PF(酚醛树脂)。以热塑性PF的残炭率为考核指标,采用单因素试验法优选出制备硅改性PF的最优方案。结果表明,当m(苯酚)∶m(甲醛)=(1.30～1.36)∶1时,硅改性PF的残炭率较高且变化不大;当w(SiO2粉体)=0.9%、反应温度为90℃和反应时间为3 h时,改性热塑性PF的残炭率相对较高;此时,Si元素已均匀分布在PF基体树脂上,掺杂的SiO2有助于提高热塑性PF的耐热性能。
Adding a certain amount of SiO2 powder modifier into the raw materials of phenol and formaldehyde can successfully prepare modified thermoplastic PF (phenolic resin). Taking the residual char yield of thermoplastic PF as the evaluation index, the optimal scheme of preparing silicon modified PF was optimized by single factor test. The results show that the residual char yield of silicon modified PF is high and little changed when m (phenol): m (formaldehyde) = (1.30-1.36): 1. When w (SiO2 powder) When the temperature is 90 ℃ and the reaction time is 3 h, the carbon residue rate of the modified thermoplastic PF is relatively high. At this time, the Si element is uniformly distributed on the PF matrix resin, and the doped SiO2 helps to improve the resistance of the thermoplastic PF Thermal performance.