有机酸改性纳米碳酸钙及其对酚醛树脂耐水性能的影响

Nano Calcium Carbonate and Organic Acid-Modified Phenolic Resin on Water Resistance

以硬脂酸、油酸及十二酸为改性剂,利用湿法活化工艺对纳米碳酸钙进行表面改性,并将其填充到酚醛树脂中。利用正交实验考察了改性时间、改性温度及改性剂用量对改性效果的影响,并确定了不同改性剂改性纳米碳酸钙的最佳条件。结果表明,油酸改性纳米碳酸钙的效果最好,其最佳改性条件为:改性时间30min,改性温度75℃,改性剂用量为纳米碳酸钙用量的4%(wt.)纳米碳酸钙经油酸改性后吸油值降低至22,比未改性纳米碳酸钙降低了71.05%,活化度接近100%。将改性纳米碳酸钙分散到酚醛树脂中,使它的耐水性能提高3倍以上。

Stearic acid,oleic acid and lauric acid as modifier,a wet activation process for surface modification of nanometer calcium carbonate,and filled phenolic resin.Orthogonal experiment to investigate the modification time,temperature and i MPact modifi ed the amount of modifi cation effect modifi er and determine the optimum conditions of different modifi ers modifi ed nano calcium carbonate.The results showed that oleic acid modified nano calcium carbonate of the best,the best modification conditions ：（.Wt）modifi cation time 30 min,modifi cation temperature 75 ℃,modifi er in an amount of 4% of the amount of nano-calcium carbonate nano calcium carbonate modifi ed by oleic acid oil absorption value decreased to 22,than the unmodifi ed nano calcium carbonate decreased 71.05%,activation of close to 100%.The modifi ed nano calcium carbonate dispersed phenolic resin to make it water resistance increased by more than 3 times.