三元共聚物增黏降滤失剂的制备及性能评价

Preparation and performance evaluation of terpolymer viscosity increasing and fluid loss reducing agent

以丙烯酰胺、丙烯酸和2-丙烯酰胺基-2-甲基丙磺酸为单体,过硫酸钾/亚硫酸氢钠为引发剂,采用水溶液聚合法制备了三元共聚物增黏降滤失剂。通过单因素实验分析了溶液pH值、单体配比、反应温度、引发剂用量对三元共聚物特性黏数的影响,从而确定了最佳制备条件为:pH值为8,反应温度为35℃,单体配比m(AM)∶m(AA)∶m(AMPS)=65∶10∶25,引发剂用量为0.010%,由此获得的产物特性黏数为7.8 dL·g^(-1)。性能评价结果表明,所制备的三元共聚物抗温达到180℃,在淡水基浆、盐水基浆和复合盐水基浆中分别加入0.5%、1.0%和1.5%的三元共聚物,高温老化后表观黏度保留率分别达到71.4%、62.5%、52.0%,滤失量均不超过10.0mL,具有良好的增黏降滤失特性和抗温、抗盐、抗钙性能。

Using acrylamide,acrylic acid,and 2-acrylamido-2-methylpropanesulfonic acid as monomers,and potassium persulfate/sodium bisulfite as initiators,a terpolymer viscosity-increasing filtrate reducer was prepared through aqueous solution polymerization.The effects of solution pH,monomer ratio,reaction temperature and initiator dosage on the intrinsic viscosity of the terpolymer were analyzed through single-factor experiments.The optimum preparation conditions were determined as follows:the pH value of 8,reaction temperature of 35℃,monomer ratio m(AM)∶m(AA)∶m(AMPS)of 65∶10∶25 and initiator dosage of 0.010%,the resulting product intrinsic viscosity was 7.8dL·g^(-1).The performance evaluation results demonstrate that the prepared terpolymer exhibits temperature resistance up to 180°C.When 0.5%,1.0%and 1.5%of the terpolymers were added to fresh water-based pulp,salt water-based pulp,and composite salt water-based pulp,respectively,the apparent viscosity retention rates after high-temperature aging reached 71.4%,62.5%and 52.0%,respectively.Additionally,the filtration loss was less than 10.0 mL,indicating excellent viscosity increase and filtration loss reduction as well as temperature-resistant,salt-resistant and calcium-resistant properties.