【作者】 徐闫；

【导师】 谭晓明；

【作者基本信息】 华中师范大学 ， 农药学， 2007， 硕士

【摘要】 本文采用原位聚合的方法，制备出了一种蒙脱土（MMT）改性的甲阶酚醛（MMT／PF）树脂，并利用MMT／PF树脂制备出一种环保型的高强度酯固化碱性甲阶酚醛树脂粘结剂（Ester-Cured Phenolic resin，ECP）。研究了分散方法、分散时间，以及聚乙二醇（PEG）分子量等对MMT表面改性效果的影响，反应条件对MMT／PF树脂合成的影响，MMT／PF树脂水溶液粘结剂的组成、固化条件等与抗拉强度的关系，MMT／PF树脂在有机酯作用下的固化机理，以及固化反应动力学，酯固化MMT／PF树脂复合物受热过程中的特点，及热分解动力学。结果表明：利用超声分散法，把分子量400的PEG（PEG-400）在MMT中分散10min的改性效果最好；MMT／PF水溶液粘结剂的抗拉强度分别在MMT用量为0.6％左右、三醋酸甘油酯用量25％左右、50℃的固化温度、24h的固化时间时取得最大值；蒙脱土改性酚醛树脂的酯固化主要是酚羟基发生交联反应，羟甲基之间及羟甲基与酚环上活泼氢之间的反应，而且羟甲基主要与酚环的邻、对位氢发生反应；随着反应温度的升高，三种醋酸甘油酯对酚醛树脂的催化作用都明显增强，但增加的速率不一样，三醋酸甘油酯和二醋酸甘油酯的催化固化是一级动力学反应，反应活化能依次是11.00 kJ·mol^-1和23.76 kJ·mol^-1，单醋酸甘油酯的催化固化是二级动力学反应，其反应活化能是65.39 kJ·mol^-1；在加热时MMT／PF树脂会发生二次固化，随着MMT／PF树脂中蒙脱土的含量增加，其耐热性增强；MMT／PF树脂的热分解反应是一级动力学，随着温度的升高反应级数减小，活化能为41.83kJ·mol^-1。更多还原

【Abstract】 Resol Phenolic Resin modified by Montmorillonite （MMT/PF resin） was prepared in situ polymerization, and it was used to prepare a kind of environmental Ester-Cured Phenolic resin （ECP）.The effect of dispersion methods、dispersion time and the molecular weight of polyethylene glycol on the montmorillonite surface modification, the effect of reaction condition on the preparation of MMT/PF resin, the relationship of bonding strength and the consistant of MMT/PF resin binder、curing condition etal, the curing mechanism of ester-cured MMT/PF resin, the curing reaction kinetics, the feature of ester-cured MMT/PF resin heated process, and the thermal decomposition kinetics were studied. The results showed that : MMT modified by PEG of molecular weight 400 （PEG-400） through ultrasonic dispersion method for 10min was best ; the bonding strength of MMT/PF resin binder was the biggest respectively when the MMT amount was 0.6% approximately、when the triacetyl glycerine amount was 25% approximately、when the curing temperature was 50℃、when the curing time was 24h ; the curing process of MMT/PF resin was the reaction of resin hydroxyl, the reaction of hydroxymethyl and the reaction of hydroxymethyl and active hydrogen ; the catabilyty of three kinds of acetin increased obviously with different rate when the temperature raised , and the triacetyl glycerine and glyceryl diacetate catalysis was first order reaction , the activation energy of which was 11.00 kJ·mol^-1和23.76 kJ·mol^-1 respectively , while monoacetin catalysis was second order reaction , the activation energy of which was 65.39 kJ·mol^-1 ; MMT/PF resin would occur secondary consolidation when it was heated ; the heat resistance increased when the MMT amount of MMT/PF resin increased ; the thermal decomposition of MMT/PF resin was first order reaction , and when the temperature raised the reaction order was smaller , the activation energy was 41.83 kJ·mol^-1 .更多还原