改性β-环糊精共聚物稠化酸的合成与评价

Synthesis and Evaluation of a copolymer with modified β-cyclodextrin used in acid fracturing

摘要:

摘要：以马来酸酐和β-环糊精为原料，N, N-二甲基甲酰胺（DMF）为溶剂，经醇解反应合成了乙烯基β-环糊精单体（MAH-β-CD）。以丙烯酰胺（AM）、2-甲基-2-丙烯酰胺基丙磺酸（AMPS）、二甲基二烯丙基氯化铵（DMDAAC）及合成的MAH-β-CD为单体, 通过自由基水溶液聚合法制备了一种四元共聚物（PAADM）。通过正交试验和单因素变量法得出四元共聚物最优合成条件为:m(MAH-β-CD):m(AM):m(AMPS):m (DMDAAC)=1:69:20:10，引发剂用量为0.4%（占单体总质量），反应温度45℃，单体浓度20%，反应时间6 h，pH=7。通过红外光谱和紫外可见吸收光谱对共聚物进行了结构表征，表明合成的聚合物即为目标产物。聚合物的性能评价结果表明，0.8%的PAADM在20% HCl中的酸溶时间为100 min；将PAADM稠化酸与PDMC稠化酸比较结果显示，PAADM稠化酸有较好的的热稳定性及缓速性能，并且该稠化酸配伍性良好。

Abstract:

Abstract: Maleic anhydride(MAH) and β-cyclodextrin(β-CD) were chosen to synthetize vinyl β-cyclodextriny monomer(MAH-β-CD) through alcoholysis reaction, and the quaternary Copolymer was synthesized by the free radical polymerization in aqueous solution, using MAH-β-CD, acrylamide(AM), 2-methyl-2-Acrylic amide propyl sulfonic acid(AMPS) and dimethyl-diallyl-ammonium chloride(DMDAAC) as monomers. The optimum conditions achieved by orthogonal experiment and single factor experiments were that the m(MAH-β-CD):m(AM):m(AMPS): m(DMDAA) was 1:69:20:10, the reaction temperature was 45℃, the monomer concentration was 20%, the polymerization reaction continues 6 h, pH value was 7, and the dosage of initiator was 0.4%(the total mass of monomer).The structures of copolymer were characterized by IR and UV-Vis absorption spectra, indicating that the synthetic product was the target product. The evaluating results showed that the acid dissolving time of 0.8% PAADM is 100 min; Comparison PAADM and PDMC showed that the thermal stability and the slow rate of PAADM were good, and the consistency of the consistency was good.