摘要
利用凝胶渗透色谱仪对 16种不同合成条件的水溶性低分子量酚醛树脂样品进行检测 ,分别求得数均分子量mn、重均分子量 mw 和树脂质量指标。结果表明 ,苯酚∶甲醛∶ Na OH的摩尔比为 1∶ 2 .1∶ 0 .1,反应时间超过 180 min后 ,PF预聚物的分散指数小 ,分子量均匀 ;GPC谱图显示 ,谱峰比较稳定 ,分子量分布在 2 0 0～ 40 0之间的占 98.3%。树脂质量指标检测表明 :固体含量为 49.8% ;游离苯酚含量为 0 .18% ;游离甲醛含量为 0 .14% ;可被溴化物含量为 15 .5 % ;树脂粘度为 8.8m Pa· s;树脂的 p H值为 9.2 3;水混和倍数为 L >7.
The phenol formaldehyde (PF) resin samples under 16 different synthesis conditions were measured by gel penetration chromatographic instrument (GPC). The resin quality index and molecular weight was gained. The results showed that if the mole ratio of phenol∶formaldehyde∶NaOH was 1∶2.1∶0.1, synthesis time went beyond 180 min , then the resin's disperse index was smaller and the molecular was well distributed and the spectra peak was stability. The proportion of molecular distribution between 200～400 was 98.3%. Solid content was 49.8%. Free phenol content was 0.18%. Free formaldehyde content was 0.14%. Brominable substance content was 15.5%. Resin viscosity was 8.8 mPa·s . pH value of resin was 9.23.The ability of dissolve in water was beyond 7.5.
出处
《木材工业》
2001年第4期19-21,共3页
China Wood Industry
